Evaluation of non-genetic factors affecting calf growth, reproductive performance and milk yield of traditionally managed Sheko cattle in southwest Ethiopia

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Table 2 Least squares means (±SE) for effects of agro ecology, season and parity on days open and calving interval

Effects and levels	N	DO (days)	CI (months)
Overall	75	248.32 ± 6.02	17.40 ± 0.20
R²		0.69	0.70
C.V. %		13.16	6.24
AEZ		**	**
Lowland	43	274.63 ± 6.16	18.35 ± 0.20
Midland	32	220.53 ± 6.17	16.54 ± 0.20
Season		**	**
Dry	20	279.41 ± 14.53^a	18.59 ± 0.48^a
Short rainy	31	220.29 ± 7.35^b	16.42 ± 0.24^b
Main rainy	24	243.04 ± 10.96^ab	17.32 ± 0.36^ab
Parity		**	**
1st	22	289.02 ± 9.93^a	18.79 ± 0.33^a
2nd	14	250.29 ± 10.67^b	17.65 ± 0.35^b
3rd	12	267.75 ± 8.58^ab	18.04 ± 0.28^ab
4th	17	218.73 ± 14.25^cb	16.66 ± 0.47^cbd
5th	10	212.12 ± 15.54^cb	16.08 ± 0.52^c

Means with different superscripts within the same column and class are statistically different
CI calving interval, DO days open
* P < 0.05; ** P < 0.01