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Table 1 Least squares means for the effect of birth season, parity and year on replacement rate and component traits at Holta Bull Dam Station

From: Genetic and non-genetic parameters of replacement rate component traits in Holstein Friesian cattle

Source Total preg. Proportion of birth from total pregnancy Proportion from normal births (sex ratio) Proportion from female calves birth Female replacement rate from
Abnormal Normal Male Births Female births Died Culled Female births Total Preg.
Overall 3092 360(0.12) 2732(0.88) 1435(0.525) 1297(0.475) 303(0.23) 90(0.07) 904(0.70) 0.29
Season   NS NS NS NS NS NS NS NS
Dry 1368 172(0.13) 1198(0.88) 615(0.51) 583(0.49) 142(0.24) 36(0.06) 405(0.70) 0.30
Short 740 83(0.11) 656(0.89) 355(0.54) 301(0.46) 66(0.22) 20(0.07) 215(0.71) 0.29
Long 984 105(0.11) 878(0.89) 465(0.53) 413(0.47) 95(0.23) 34(0.08) 284(0.69) 0.29
Parity   * * *** * * NS *** NS
1 898 141(0.16) 757(0.84) 391(0.52) 366(0.48) 97(0.27) 22(0.06) 247(0.67) 0.28
2 660 70(0.11) 590(0.89) 329(0.56) 261(0.44) 61(0.23) 16(0.06) 184(0.70) 0.28
3 493 43(0.09) 450(0.91) 245(0.54) 205(0.46) 46(0.22) 14(0.07) 145(0.71) 0.29
4 373 34(0.09) 339(0.91) 169(0.50) 170(0.50) 35(0.21) 18(0.11) 117(0.69) 0.31
5 258 32(0.12) 226(0.88) 111(0.49) 115(0.51) 30(0.26) 9(0.08) 76(0.66) 0.29
6 169 17(0.10) 152(0.90) 75(0.49) 77(0.51) 10(0.13) 6(0.08) 61(0.79) 0.36
7 113 13(0.12) 100(0.88) 49(0.49) 51(0.51) 14(0.27) 3(0.06) 34(0.67) 0.30
8+ 128 12(0.09) 116(0.91) 66(0.57) 52(0.43) 10(0.19) 2(0.04) 40(0.77) 0.32
Year   *** *** *** *** *** *** *** ***
1986-88 70 4(0.06) 66(0.94) 38(0.58) 28(0.42) 0(0.0) 0(0.0 28(1.0) 0.40
1989 71 6(0.08) 65(0.92) 39(0.60) 26(0.40) 0(0.0) 0(0.0) 26(1.00) 0.37
1990 89 11(0.12) 78(0.88) 42(0.54) 36(0.46) 0(0.0) 0(0.0) 36(1.00) 0.40
1991 52 8(0.16) 44(0.84) 21(0.48) 23(0.52) 0(0.0) 0(0.0) 23(1.00) 0.44
1992 39 7(0.19) 32(0.81) 12(0.37) 20(0.63) 0(0.0) 0(0.0) 20(1.00) 0.51
1993 117 10(0.08) 107(0.92) 48(0.45) 59(0.55) 7(0.12) 0(0.0) 51(0.88) 0.44
1994 192 28(0.15) 165(0.85) 84(0.51) 81(0.49) 12(0.15) 3(0.04) 66(0.81) 0.34
1995 123 8(0.07) 115(0.93) 62(0.54) 53(0.46) 13(0.25) 2(0.03) 38(0.72) 0.31
1996 143 19(0.13) 124(0.87) 69(0.56) 55(0.44) 4(0.07) 1(0.02) 50(0.91) 0.35
1997 159 14(0.09) 145(0.91) 81(0.56) 64(0.44) 22(0.34) 2(0.03) 40(0.63) 0.25
1998 177 19(0.11) 158(0.89) 78(0.49) 80(0.51) 17(0.21) 18(0.23) 45(0.56) 0.25
1999 157 9(0.06) 148(0.94) 75(0.51) 73(0.49) 21(0.29) 14(0.19) 38(0.52) 0.24
2000 200 19(0.10) 181(0.90) 100(0.55) 81(0.45) 15(0.19) 10(0.12) 56(0.69) 0.28
2001 190 40(0.21) 151(0.79) 76(0.51) 75(0.49) 17(0.23) 8(0.11) 50(0.67) 0.26
2002 214 25(0.12) 189(0.88) 113(0.60) 76(0.40) 15(0.20) 10(0.13) 51(0.67) 0.24
2003 193 31(0.16) 162(0.84) 83(0.51) 79(0.49) 26(0.33) 5(0.06) 29(0.61) 0.25
2004 175 20(0.11) 155(0.89) 80(0.52) 75(0.48) 20(0.27) 8(0.11) 47(0.63) 0.27
2005 147 17(0.12) 130(0.88) 65(0.50) 65(0.50) 29(0.47) 6(0.09) 30(0.46) 0.20
2006 162 20(0.12) 142(0.88) 74(0.52) 68(0.48) 33(0.49) 1(0.02) 34(0.50) 0.21
2007 175 25(0.14) 150(0.86) 76(0.51) 74(0.49) 36(0.47) 2(0.03) 40(0.49) 0.21
2008 86 4(0.05) 82(0.95) 38(0.46) 44(0.54) 14(0.32) 0(0.0) 30(0.68) 0.35
2009 77 9(0.12) 68(0.88) 41(0.60) 27(0.40) 2(0.07) 0(0.0) 25(0.93) 0.32
2010 84 9(0.11) 75(89.0) 40(0.53) 35(0.47) 0(0.0) 0(0.0) 35(1.00) 0.42
  1. Preg. = pregnancy; * = (P ≤ 0.05); *** = (P ≤ 0.01); NS = not significant.
  2. Figures in parentheses are proportions.