Maternal slaughter at abattoirs: history, causes, cases and the meat industry
© Fayemi and Muchenje; licensee Springer. 2013
Received: 22 January 2013
Accepted: 4 March 2013
Published: 22 March 2013
Animals of both sexes are slaughtered for meat and meat products at the abattoirs. It has been found in few countries that one-out-of-every-three ewe and one-out-of-every-four doe with single, twin or multiple foetuses are slaughtered in registered slaughterhouses. In quest for meat, numerous viable embryos and foetuses are wasted unnoticed since the productive pregnant animals are not spared in the process. The trend in the slaughter of pregnant animals for meat (ranging from 54.5% to 70.1%) therefore calls for a review to reminisce issues on slaughter reforms, emphasize its implication on losses of genetic materials and sustainability of meat production. As a way of ensuring that welfare quality® assessment is not compromised and cruelty is prevented during animal slaughter, the quantitation of housekeeping genes and naturally occurring microRNAs (miRNAs) are recommended for identifying candidate pain biomarkers. In order to respect consumers’ right however, the manuscript suggests meat branding where the consumption of meat from pregnant animals is ethical.
Livestock husbandry and slaughter have become millenary traditions in every part of the World. The main reason for these traditions is that humans are at the top of the biological chain in the habit of meat consumption (Okoli et al. 2006). This therefore serves as the foremost reason for maintaining animal populations to provide a nutritious and desirable form of food for people (Adama et al. 2011). Although globally, the practice of slaughtering different breeds of livestock has been sustained, the pregnancy status of the animal being slaughtered for meat still remains a hideous issue in many countries (Aberle et al. 2001; Warriss, 2008). The scenario of animal slaughter in abattoirs has shown that not only the conventional non-breeding livestock are slaughtered for meat but also the productive pregnant and lactating ones (Gregory and Grandin, 2007; Whitlock and Maxwell, 2008; Adama et al. 2011). These animals are either killed for daily meals or occasionally for rituals, religious festivals, ceremonies, drug formulations, disease control or to meet immediate financial needs (Gregory and Grandin 2007; Cadmus and Adesokan, 2010 2012).
inspection (Grandin The attendant embryonic and foetal wastages due to this practice consequently query the efficiency of ante-mortem 2004; Addass et al. 2010) and the rationale for converting pregnant animals to beef, mutton, chevon, pork, offal and other meat types. It also challenges the ethical evidence supporting the act of slaughtering pregnant animals in situations where there is no law supporting the practice. In most cases, meat consumers are even unaware or denied the right to know the status of the animal that is converted to meat they eat. In the past, studies have been focused on: animal right (Galvin and Herzog 1992), protection of animal welfare standards (Botreau et al. 2007; Thornber 2010), conservation of animals’ genetic resources (Woolliams et al. 2007); pre-slaughter stress responsiveness (Terlouw et al. 2008; Muchenje et al. 2009a); abattoir and slaughter surveillance (Addass et al. 2010), animal slaughter and meat quality (Hoffman et al. 2009; Muchenje et al. 2008; 2009b). Obviously, these studies have made novel contributions to animal welfare and meat science in general yet; cases of slaughtering pregnant animals for meat production have not received adequate attention. Hence, this review therefore attempts to: retrace history behind the promulgation of slaughter reforms; highlight causes and cases of maternal slaughter. It also suggests some ideas on how the quantitation of pain biomarkers can aid “humane slaughter of animals or Welfare Quality® assessment” for preventing cruelty to animals at slaughter, curbing the extinction of meat species and for respecting consumers’ right.
Reminiscence on abattoir and slaughter reforms
The practice of animal slaughter to produce meat for consumption is inadvertently dated back to antiquity. The history behind the existence of public abattoirs had been traced to Roman civilization and France, between 15th and 16th centuries (Bello and Oyedemi, 2009). The law of 1890 in Italy required that public abattoirs be provided in all communities of more than six thousand inhabitants (Oldfield 1895). Similar developments were reported in Norway, Sweden, Denmark, Netherlands and Rumania (Jode et al. 1906). During the 1880’s and early 1890’s, the animal-protectionists, veterinarians and anti-Semitic societies in Saxony and in parts of Germany consequently lobbied for slaughterhouse reforms (Judd 2003). They sought the licensing of slaughterers and the restriction of the abattoir operations to men only. They also proposed the implementation of stricter inspection procedures and the stunning of animals into a state of unconsciousness before their slaughter. These groups as well, called for change because they were convinced that the current state of affairs in the municipally-run slaughter houses posed a risk to the public’s health (Judd 2003). In their view, the activities at the abattoir allegedly encouraged cruel behaviour, attracted unsavoury characters from employees and were responsible for the accumulation of contaminants from its dirty and bloody surfaces (Judd 2003; Ubwa et al. 2013).
Saxon animal protectionists also expressed concern with the traditional ways in which animals were slaughtered for food (Metcalf 1989; Judd 2003; Lavi 2007). The concern later became the Dutch Veterinarians’ motto: ‘Hominum animaliumque saluti, ‘to the benefit of man and animal alike’ indicating their role in maintaining animal resources and protecting animal and human health (Smith and Philips 2002). Laws for the protection of animals existed in the Australian states before Australia’s federation in 1901 (Jode et al. 1906) and remained the dominant policy instrument for animal welfare until the 1980s. These laws were directed against cruelty which was interpreted as willful or needless infliction of pain or spiteful neglect of the animal (Grandin 2004). While the prevention of cruelty to animal acts were revised regularly to keep pace with the time, it became apparent in the latter half of the twentieth century that these anti-cruelty acts provided insufficient protection for animal welfare (Thornber 2010). This is because the subject of animal slaughter and their pre-slaughter welfare is considered to be very unpleasant. Often, the personnel concerned prefer not to know the details of what goes on inside a slaughterhouse or rather feel secured to conceal it in order to avoid controversy or suspicion (Grandin 2004).
Cases of slaughtering pregnant animals at the abattoirs
Pregnancy stage and foetal number of slaughtered pregnant animals
Pregnancy stage (1st -3rd Trimester)
Khan and Khan (1989).
Sonfada et al. (2009).
Mukasa-Mugerwa and Tekelye (2003).
In all these cases, various pregnancy diagnoses have been adopted to ascertain the status of the meat species presented for slaughter. This is necessary as a means of conserving valuable genetic resources from livestock and consequently work towards sustainability of meat production (Ślósarz et al. 2007; Verberckmoes et al. 2004; Whitlock and Maxwell 2008; Grazul-Bilska et al. 2010) using pregnancy-associated glycoproteins as biomarkers (Garbayo et al. 2000; Jerome 2012). The presence of early conceptus proteins such as ovine Trophablast protein I (OTP-1) which prevents the release of PGF2α has also been used for pregnancy diagnosis in sheep (Bretzlaff and Romano 2001) and the appearance of cytokinen at approximately day 15 post mating as pregnancy indicator in goats (Goossens et al. 1998). Laparoscopy, laparotomy within 18–25 day post mating and serum progesterone (P4) values higher than 1 ng/ml; the secretion of 17& 22–24 KDa proteins on day 17 post mating in the caprine conceptus, non-return to eostrus and the expression of follistatin and activin during oestrous cycle confirmed follicular development at slaughter have been reported in literature too (Wani 1982; Xia et al. 2010).
More than 90% of the affected animals in different states of gravidity have also been found slaughtered during the last two trimesters of pregnancy. Among many techniques, several authors (Tajik et al. 2001; Boscos et al. 2003; Verberckmoes et al. 2004; Yotov 2007 have confirmed the pregnancy status at second trimester using: maternal serum alpha fetoprotein (MSAFP) levels; maternal serum chorionic gonadotropin levels (α hCG, beta hCG peak concentration); unconjugated estriol; inhibin (α and β-inhibins); multiple marker screening; neutrophils alkaline phosphatase; scwangeschafts protein1; the proform of eosinophil major basic protein (proMBP); placental isoferrintin p43 component; foetal cell sorting; bioactive modulators (E2 and F2α) and metabolizing enzymes for characterization of DNA+. In their third trimester, palpation and ballotment; foetal measurements; ultrasonography and morphology imaging of endometrial have established the pregnancy status of cows, does, ewes, mares, sows and others (Beg et al. 2001; Bretzlaff and Romano 2001; Calamari 2001; Flores et al. 2001; Verberckmoes et al. 2004; Whitlock and Maxwell, 2008; Grazul-Bilska et al. 2010).
The visual assessment of the reproductive tracts from the right and left side and, the palpation of the uterus, ovaries and oviduct have been used at a local abattoir in Pakistan to substantiate that 61% of the cows were pregnant at the point of slaughter (Khan and Khan, 1989). In buffaloes and cows, each pregnancy was reported comprising a single foetus with the distribution of 51.11% on the right and 48.88% on left side in buffaloes whereas in cows, 57.14% on the right and 42.85% on left side (Khan and Khan 1989; Ladds et al. 2008). Harvested ovaries from the slaughtered animals have equally shown evidence of current and past reproductive states of such animals in the form of follicles at varying stages of oestrous cycles, embryonic trophoblastic adhesions, implantation and foetal-placental developments (Arthur et al. 1982; Bretzlaff and Romano 2001; Okoli et al. 2006).
Socio-economic and physiologic reasons for converting pregnant animals to meat
The exploitation of conjugated equine oestrogen (CEE) from pregnant horses for the treatment of menopausal syndrome in women is another reason behind the slaughter of pregnant horses for meat. The utilization of this hormone for alleviating age-related mnemonic decline or for improving spatial reference memory and for the prevention of scopolamine-induced amnesia is connected with the reason for massive slaughter of pregnant horses (Frick et al. 2002; Creidi et al. 2005). The extraction of Premarin from pregnant horse to enhance the facial skin of ageing post-menopausal women also support, the biochemical benefits for the slaughter of pregnant animals in some countries (Williams 1994; Frick et al. 2002).
The recurrence of spontaneous abortion by pregnant heifers within 3 weeks of arrival at the feedlots has been noted by some farmers as a rationale for presenting their pregnant heifers for slaughter. The disruptive bulling behaviour being recognised was implicated by other farmers for slaughtering pregnant cows by Gregory and Grandlin (2007). The occurrence of bulling amounting to 11% during the peak period in autumn and winter has always left the victimized in-calf cows ill as a result of unwanted mounting by the buller steers. The exhibition of buller syndrome by the bulling steers usually influences some cattle farmers in the USA to cull their injured pregnant cows. The depressions in the beef market in the United State of America have sometimes compelled farmers as well to offer 1–3% of their pregnant heifers for slaughter and retain fewer heifers on their farms as breeding replacements (Gregory and Grandin 2007). It was reported that a total of 28.29% of cows in their third trimester of pregnancy were culled because of infertility, 21.8% for mastitis and 15.8% as a result of old age (Singleton 1996; Ernst 2009).
Approximately, 27.3% of the farmers who consigned these animals for slaughter were ignorant of the fact that the cows were actually pregnant but only 21.8% of the farmers were aware of the physiological status of these cows. At least 6% of the culled cows were “discarded” for fertility reasons when they were actually pregnant. Otherwise known as euthanasia, few authors have indicated that emergency slaughter may be an exceptional situation that might necessitate slaughtering pregnant animals (Grandin 1994; Butterworth, 2000; Biggs and Blackwell 2005). When emergency slaughter remains the only alternative, it is expected that the farmer contact the slaughter operators and the Official Veterinarian must rather be present during the ante-mortem and post-mortem inspection to declare the meat either fit or unfit for human consumption (Gregory and Grandin 2007). This is the only permissible situation in the USA when maternal slaughter will not be considered as cruelty to the animal (Singleton 2010) otherwise; fines will be paid by the culprit (Perera 2006; Cowan 2012).
In the USA and Sri Lanka, a sum of one hundred thousand Sri Lankan Rupee (Rs 100,000.00; which is equivalent to USD 888.54) is paid as fine in Sri Lanka for violating the revolutionary legislation on cruelty to animals (Perera 2006). The guilty abattoir operator in the USA goes through chains of punishments. The license of the convicted abattoir operator will either be suspended or revoked for conviction of a felony and offense on animal cruelty. A sum of one thousand US Dollar is paid for the first offense, five thousand USD for the second and ten thousand USD for the third and subsequent offenses for cruelty on livestock including maternal slaughter of animals at slaughterhouses (Laura 2010). The United States of America also has a version of H.R.2744 (USDA’s FY2006) appropriation bill to prohibit non-ambulatory livestock (also called downers) from being slaughtered for human food (Cowan 2012).
Conclusion and recommendation on maternal slaughter
Non-conformity to the rules for which only unproductive, infertile, sterile, old or accidentally injured animals are allowed to be slaughtered shows as a drift from the original code of conduct on public abattoir operation (Jode et al. 1906; Judd 2003). So far from pre-slaughter welfare perspective, no information is available on pain manifestations and anoxic signals that accompany the production of cytotoxic cascade and activation of brain damaging processes when pregnant animals are slaughtered. Due to human preference for veal, a study has shown that calf foetuses do not feel pains when electrically stunned based on the impact of endogenous neuron-inhibitors Mellor et al. (2005); Mellor (2010). Hitherto, there is no report indicating if the same is obtainable when pregnant cows, ewes, mares, does, sows and others are stunned before exanguination. Through indigenous knowledge system (IKS) where animals are slaughtered without stunning, dearth of information still exists even when pregnant animals, calves, lambs or kids are conducted through traditional slaughter proceedings (Fayemi and Muchenje 2012).
As postulated in cellular genomics (Bartel 2004; Moqil 2012), there is a possibility that studies on the roles of naturally occurring non-coding micro ribonucleic acids (miRNAs) might profoundly inhibit the expression of pain genes and epigenetic mechanisms. Since miRNAs are endogenously produced, its molecular mechanism fuels the binding of small-interfering RNA strands to Argonaute proteins to form effectors complexes known as RNA induced silencing complex. In animals, miRNAs function in a way to direct mRNA cleavage or repress translation of complementary RNAs during brain development, organogenesis, pathways signalling, apoptosis, metabolism, cardiogenesis and many other biological processes (McDaneld 2009; Wang et al. 2010). It becomes expedient in future studies therefore, to link the roles of endogenous neuron-inhibitors with changes in noiceptors miRNA producing enzymes while pregnant meat species undergo stunning and slaughter processes at the abattoir or in traditional settings.
Moreover, research efforts should be directed to use appropriate pain biomarkers at different parity stages to characterize response to slaughter pains (with or without stunning) by pregnant animals. Molecular quantification of neuropathic biomarkers (ubiquitin C-terminal hydrolase-L1; S-100β neuroprotein; glial fibrillary acidic protein; neuron specific enolase, etc.) will be necessary to ascertain the degree of gene disorder or analgesic sensitivity of pregnant animals at slaughter. The characteristic expressions of housekeeping genes are also suggested as means of understanding syndromes featuring absence or presence of relevant pain candidate genes in pregnant animals at slaughter. More studies should also be focused on:
The breed of livestock that is more prone to maternal slaughter and subtle erosion of genetic materials.
Restocking programme of meat species commonly slaughtered when pregnant.
Kind of pregnancy (normal or ectopic) and foetal physiological condition from livestock that are presented for slaughter.
Diet -related risk factor or diet intervention related to the consumption of meat from pregnant animals.
Creation of consumer awareness and branding of meat from pregnant animals.
The authors are grateful to Govan Mbeki Research and Development Centre (GMRDC) and the National Research Foundation (NRF Project T134) for providing financial assistance for this work.
- Abdulkadir U, Jiya EZ, Kosu SA: Survey of fetal wastages: a case study of Makurdi abattoir in Benue State from 1997 to 2002. Pak J Nutr 2008, 7(3):450-452. 10.3923/pjn.2008.450.452View ArticleGoogle Scholar
- Aberle ED, Forrest JC, Gerrard DE, Mills EW: Principles of Meat Science vol 4. Third edition. USA: Kendall/Hunt Publishing Company; 2001:92-95.Google Scholar
- Adama JY, Shiawoya EL, Michael N: Incidence of foetal wastages of cows slaughtered in Minna abattoir, Niger state. Nigeria J Appl Biosci 2011, 42: 2876-2881.Google Scholar
- Addass PA, Midau A, Milka M, Tizhe MA: Assessment of Abattoir foetal wastage of cattle, sheep and goat in Mubi main Abattoir Adamawa State. Nigeria World J Agri Sci 2010, 6(2):132-137.Google Scholar
- Ademola AI: Incidence of fetal wastage in cattle slaughtered at the Oko-Oba Abattoir and Lairage, Agege, Lagos, Nigeria. J Vet Res 2010, 3(3):54-57.Google Scholar
- Arthur GH, Moakes DE, Pearson H: Veterinary Reproduction and Obstetrics. 5th edition. London: Bailliere Tindall; 1982.Google Scholar
- Bartel DP: MircoRNAs: genomics, biogenesis, mechanism and function. Cell 2004, 116: 281-297. 10.1016/S0092-8674(04)00045-5View ArticleGoogle Scholar
- Beg MA, Bergfelt DR, Kot K, Wilt bank MC, Ginther JO: Follicular fluid factors granulose-cell gene expression associated with follicle deviation in cattle. Biol Repro 2001, 64: 432-441. 10.1095/biolreprod64.2.432View ArticleGoogle Scholar
- Bello MB, Garba HS, Sonfada ML: Foetal wastages in camels slaughtered at Sokoto municipal abattoir, Sokoto. J Vet Sci 2008, 7(1):46-49.Google Scholar
- Bello YO, Oyedemi DTA: The Impact of Abattoir activities and Management in Residential Neighbourhoods: A Case study of Ogbomoso, Nigeria. J Soc Sci 2009, 19(2):121-127.Google Scholar
- Biggs A, Blackwell JM: Emergency slaughter, and changes to the OTM rule. Vet Rec 2005, 157(16):490-491.View ArticleGoogle Scholar
- Boscos CM, Samartzi FC, Lymberopoulos AG, Stefanakis A, Belibasaki S: Assessment of progesterone concentration using enzyme immunoassay for early pregnancy diagnosis in sheep & Goats. Repro Dom Anim 2003, 38(3):170-174. 10.1046/j.1439-0531.2003.00407.xView ArticleGoogle Scholar
- Botreau R, Bonde M, Butterworth A, Perny P, Bracke MBM, Capdeville J, Veissier I: Aggregation of measures to produce an overall assessment of animal welfare. Part 1:a review of existing methods. Anim 2007, 1(8):1179-1187.Google Scholar
- Bretzlaff KN, Romano JE: Advanced reproductive techniques in goats. Vet Clin North Am Food Anim Pract 2001, 17(2):421-434.View ArticleGoogle Scholar
- Butterworth A: Euthanasia of large animals. Vet Rec 2000, 147(3):84.Google Scholar
- Cadmus SIB, Adesokan HK: Bovine fetal wastage in Southwestern Nigeria: A survey of some abattoirs. Trop Anim Health Prod 2010, 42(4):617-621. 10.1007/s11250-009-9465-xView ArticleGoogle Scholar
- Calamari CV: Evaluation of two methods for early pregnancy diagnosis in ewe: transectal ultrasonography and pregnancy detector for small ruminant (DPPR-80®). DPPR80R, 57; 2001.Google Scholar
- Cowan T: Horse slaughter prevention bills and issues. Congressional Research Servic; 2012:1-11. Available on: . Acceessed in February 2013 http://www.crs.gov Available on: . Acceessed in February 2013Google Scholar
- Creidi P, Faivre B, Agache P, Richard E, Haudiquet V, Sauvanet JP: Effect of a conjugated oestrogen (Premarin®) cream on ageing facial skin: a comparative study with a placebo cream. International Health Foundation South-East Asia Study 2005, 19(3):211-223.Google Scholar
- Cudworth E: Most farmers prefer Blondes’: The Dynamics of anthroparchy in Animals Becoming Meat. J Crit Anim Stud 2008, 6(1):32.Google Scholar
- Ernst S: Pregnancy at slaughter: What Happens to the Calves? Part1. Anim. 2009. Available on: http://animals.change.org Google Scholar
- Fayemi PO, Muchenje V: Meat in African context: From history to science. Afr J Biotechnol 2012, 11(6):1298-1306.View ArticleGoogle Scholar
- Flores JM, Sanchez MA, Nieto A, Sanchez B, Gonzalez M, Garcia P: Detection of estrogen alpha and progesterone receptors and cell proliferation in the uterus during early pregnancy in goat. Theriog 2001, 56(2):341-355. 10.1016/S0093-691X(01)00568-4View ArticleGoogle Scholar
- Frick KM, Fernandez SM, Bulinski SC: Estrogen replacement improves spatial reference memory and increases hippocampal synaptophysin in aged female mice. Neurosci 2002, 115(2):547-558. 10.1016/S0306-4522(02)00377-9View ArticleGoogle Scholar
- Galvin SL, Herzog HA: Ethical ideology, animal rights activism and attitudes toward the treatment of animals. Ethics and Behavior 1992, 2: 141-149. 10.1207/s15327019eb0203_1View ArticleGoogle Scholar
- Garba HS, Hassan WA, Akingbemi BT: Foetal wastage through slaughtering of pregnant cattle at the Sokoto abattoir. J Trop Vet 1998, 10: 123-126.Google Scholar
- Garbayo JM, Green JA, Manikkam M, Beckers JF, Kiesling DO, Ealy AD, Roberts RM: Caprine pregnancy-associated glycoproteins (PAG): their cloning, expression, and evolutionary relationship to other PAG. Mol Reprod Dev 2000, 57(4):311-322. 10.1002/1098-2795(200012)57:4<311::AID-MRD2>3.0.CO;2-FView ArticleGoogle Scholar
- Goossens B, Osaer S, Kora S, Chandler KJ, Petriel L, Thevasagayam JA, Woolhouse T, Andersan J: Abattoir survey of sheep and goats in The Gambia. Vet Res 1998, 142(11):277-281.Google Scholar
- Grandin T: Euthanasia and slaughter of livestock. J Am Vet Med Ass 1994, 204: 1354-1360.Google Scholar
- Grandin T: Restaurant Animal Welfare Audits of Stunning and Handling in federally inspected U.S. and Canadian beef, veal, pork, lamb, and poultry slaughter plants. 2004. Available on: http://www.grandin.com/survey Google Scholar
- Grazul-Bilska AT, Borowicz PP, Johnson MJ, Minten MA, Bilski JJ, Wroblewski R, Redmer DA, Reynolds LP: Placental development during early pregnancy in sheep: vascular growth and expression of angiogenic factors in maternal placenta. Repro 2010, 14: 165-174.View ArticleGoogle Scholar
- Gregory NG, Grandin T: Animal Welfare and Meat Production. 2nd edition. Wallingford, Oxfordshire, United Kingdom: CABI Int; 2007:168-190.View ArticleGoogle Scholar
- Hoffman LC, Cloette SJ, van Schalkwyk SJ, Botha SSC: Effect of bleeding method and low voltage electrical stimulation on meat quality of ostriches. S Afri J Anim Sci 2009, 39(3):206-213.Google Scholar
- Jerome A: An overview on Pregnancy Associated Glycoproteins in Cattle and Buffalo. J Adv Vet Res 2012, 2: 50-58.Google Scholar
- Jode L, Martel H, Mallet J: Les Abattoirs Publics. Paris: H. Dunod et E. Pinat Editeurs; 1906.Google Scholar
- Judd R: The Politics of Beef: Animal Advocacy and the Kosher Butchering. Jewish Soc Stud 2003, 10(1):117-150.View ArticleGoogle Scholar
- Khan MZ, Khan A: Frequency of Pregnant Animals slaughtered at Faisalabad Abattoir. J Islam Acad Sci 1989, 2(1):82.Google Scholar
- Ladds PW, Summers PM, Humphrey JD: Pregnancy in slaughtered cows in North-Eastern Australia: Incidence and Relationship to pregnancy diagnosis, season, age and carcass weight. Australian Vet J 2008, 51(10):472-477.View ArticleGoogle Scholar
- Laura A: Conference Committee endorses strong penalties for humane slaughter law violations. Animal Law Coalition; 2010. Available in http://www.animallawcoalition.com/farm-animalsarticles Google Scholar
- Lavi S: Animal Laws and the Politics of life: Slaughterhouse Regulation in Germany-1870 to 1917. Theo Inq Law 2007, 89(1):10-15.Google Scholar
- McDaneld TG: MicroRNA: Mechanism of gene regulation and application to livestock. J Anim Sci 2009, 87(E-Suppl):21-28.View ArticleGoogle Scholar
- Mellor DJ: Galloping Colts. Foetal feelings and reassuring regulations: Putting Animal-Welfare Science into Practice. J Vet Med Educ 2010, 37(1):94-100. 10.3138/jvme.37.1.94View ArticleGoogle Scholar
- Mellor DJ, Diesch TJ, Gunn AJ, Bennet L: The importance of awareness for understanding foetal pain. Brain Res Rev 2005, 49: 455-471. 10.1016/j.brainresrev.2005.01.006View ArticleGoogle Scholar
- Metcalf MF: Regulating slaughter: Animal protection and Anti-Semitism in Scandinavia, 1880–1941. Pat Prej 1989, 23(3):32-48. 10.1080/0031322X.1989.9970018Google Scholar
- Mogil JS: Pain genetics: past, present and future. Trends Genet 2012, 28(6):258-266. 10.1016/j.tig.2012.02.004View ArticleGoogle Scholar
- Muchenje V, Dzama K, Chimonyo M, Raats JG, Strydom PE: Meat quality of Nguni, Bonsmara and Aberdeen Angus steers raised on natural pasture in Eastern Cape. South Meat Sci 2008, 79: 20-28. 10.1016/j.meatsci.2007.07.026View ArticleGoogle Scholar
- Muchenje V, Dzama K, Chimonyo M, Strydom PE, Hugo H, Raats JG: Some biochemical aspects pertaining to beef eating quality and consumer health: A review. Food Chem 2009a, 112: 279-289. 10.1016/j.foodchem.2008.05.103View ArticleGoogle Scholar
- Muchenje V, Dzama K, Chimonyo M, Strydom PE, Raats JG: Relationship between pre-slaughter stress responsiveness and beef quality in three cattle breeds. Meat Sci 2009b, 81: 653-657. 10.1016/j.meatsci.2008.11.004View ArticleGoogle Scholar
- Muhammad BF, Haruna IY, Abdulsamad AM, Bichi JM: Foetal wastage in Northern Nigerian: The case of Gombe abattoir, Gombe State. Proceedings of the 13th Annual Conference of Animal Science (ACAS ’08). ABU, Zaria 2009, 13: 124-127.Google Scholar
- Muhammad IR, Ashiru R, Abdullahi AY: Implications of the slaughter of pregnant ewes and does to the future stock in the semi-arid urban abattoirs. J Anim Vet Adv 2007, 6(6):819-822.Google Scholar
- Mukasa-Mugerwa E, Tekelye B: The reproductive performance of Ethiopian Highland sheep. Ani Repro Sci 2003, 17(1–2):95-102.Google Scholar
- Nwakpu PE, Osakwe II: Trends in volume and magnitude of foetal waste of slaughter Animals (2000–2005) in Ebonyi State of Nigeria. Res J Anim Sci 2007, 1(1):30-35.Google Scholar
- Okoli CG, Okoli IC, Okorondu UV, Opara MN: Environmental and Public Health Issues of Animal Food Products Delivery System in Imo State. Nigeria Online J Health and Allied Sci 2006, 5(2):1-11.Google Scholar
- Oldfield J: The Groaning Creation. The ideal Publishing Union 1895, 8(1):100.Google Scholar
- Opara MN, Okoli CI, Herbert U, Adeyemo O: Ovarian morphology and estradiol-17 concentrations in serum and follicular fluid of slaughtered zebu cattle in Ibadan. Nigeria Vet Arch 2006, 76(5):403-411.Google Scholar
- Perera J: Animal Welfare Authority Bill handed over to Sri Lankan President. 2006. Available on: . Accessed in September 2010 http://www.buddhistchannel.tv/index Available on: . Accessed in September 2010Google Scholar
- Riehn K, Domel G, Einspanier A, Gottschalk J, Hildebrandt G, Luy J, Lucker E: R Schlachtung gravider Rinder- ethische und rechtliche Aspekte = Slaughter of pregnant cattle- ethical and legal aspects. 90th edition. Frankfurt am Main, Allemagne (Revue): Deutscher Fachverlag; 2010:100-106.Google Scholar
- Sanusi M, Abubakar M, Luka B: Incidence of foetal wastage in ruminant animals slaughtered at Bauchi and Jos abattoirs. Proc.31st Ann. Conf. Nig. Soc. Anim. Prod. March 12–15. Bayero University, Kano, Nigeria 2006, 31: 102-106.Google Scholar
- Singleton GE: Throwaway lives: The massacre of pregnant animals. Vegetarians International Voice for Animals (VIVA); 1996.Google Scholar
- Singleton GE: Guidance for Veterinary Surgeons on the emergency slaughter of cattle. Edinburgh: British Cattle Veterinary Association (BCVA); 2010.Google Scholar
- Ślósarz P, Frankowska A, Dobrzyński S, Frąckowiak A: Effectiveness of Early Pregnancy Diagnostics in Sheep Depending on Ultrasound Examination Method Applied. Electr J Polish Agric Univ 2007, 10(2):1-3.Google Scholar
- Smith DF, Philips J: Food, Science, Policy and Regulation in the Twentieth Century: International and Comparative Perspectives. Great Britain: Routledge and Garamond Publishing Services Limited; 2002.Google Scholar
- Sonfada ML, Shehu SA, Umar AA, Onyenusi BI: Anencephaly in a second trimester camel foetus in Sokoto, Nigeria: a case report. J Cam Sci 2009, 2: 50-52.Google Scholar
- Tajik P, Abbas V, Sarang S: Measurement of different parts in Chall fetuses to determine the pregnancy age. South-Africa: Proceedings of the5th International Sheep Veterinary-Conference-University of Stellenbosch; 2001.Google Scholar
- Terlouw EMC, Arnould C, Auperin B, Berri C, Le Bihan-Duval E, Deiss V, Lefevre F, Lensink BJ, Monier L: Pre-slaughter conditions, animal stress and welfare: current status and possible future research. Anim 2008, 2: 1501-1517.View ArticleGoogle Scholar
- Thornber PM: Animal welfare in Education and Research: An Australian perspective on developing standards and ensuring compliance. J Vet Med Educ 2010, 37(1):22-25. 10.3138/jvme.37.1.22View ArticleGoogle Scholar
- Ubwa ST, Atoo GH, Offem JO, Abah J, Asemave K: Effect of activities at the Gboko abattoir on some physical properties and heavy metals levels of surrounding soil. Int J Chem 2013, 5(1):49-57.View ArticleGoogle Scholar
- Verberckmoes S, Vandaela L, Cat S, de EL-Ameri B, Sulon J, Duchateau L, Kruif A, de Beckers JF, Soom A, Van de Cat S, de Kruif A, Van Soom A: A new test for early pregnancy diagnosis in sheep: determination of ovine pregnancy associate glycoprotein (ovPAG) concentration means of a homologous radio immunoassay. Vlaams- Diergeneeskundig- Tijdschrift 2004, 73(2):119-127.Google Scholar
- Wang Y, Li Y, Ma Z, Yang W, Ai C: Mechanism of microRNA-Target interaction: Molecular dynamics simulations and thermodynamics analysis. PLOS Comp Biol 2010, 6(7):1-19.View ArticleGoogle Scholar
- Wani GM: Laparoscopy in farm Animals. World Rev Anim Prod 1982, 18: 7-13.Google Scholar
- Warriss PD: Meat science- an introductory text (First Edition). United Kingdom: CAB International; 2008:68-86.Google Scholar
- Whitlock BK, Maxwell HS: Pregnancy-associated glycoproteins and pregnancy wastage in cattle. Therio 2008, 70(3):550-559. 10.1016/j.theriogenology.2008.05.003View ArticleGoogle Scholar
- Williams LS: Canada’s huge pregnant-mare-urine industry faces growing pressure from animal-rights lobby. Can Med Asso J 1994, 151(7):1009-1012.Google Scholar
- Woolliams JA, Matika O, Pattison J: Conservation of animal genetic resources: approaches and technologies for in situ and ex situ conservation. Anim Gen Res Infor 2007, 42: 71-85.View ArticleGoogle Scholar
- Xia Y, O’Shea T, Almanbobi G, McFarlane JR: Changes in ovarian follistatin levels during the oestrous cycle in sheep may serve as an intraovarian regulator. Repro Dom Anim 2010, 45: 509-515.View ArticleGoogle Scholar
- Yotov S: Determination of the number of foetuses in sheep by means of blood progesterone assay and ultrasonography. Bulg J Vet Med 2007, 10(3):185-193.Google Scholar
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