Assessment of progesterone profiles and postpartum onset of luteal activity in spring calving Hereford beef suckler cattle

Table 2 Univariate relationship between incidence of irregular luteal phases and study variables

Variable	Group	N	β-value	SE	Odds ratio	Chi-square	P-value
Calf 200-d weight		88	0.008	0.006	1.01	1.25	0.27
Calf 200-d weight	1^st quartile	22	-0.646	0.643	0.52	1.75	0.63
	2^nd quartile	24	0.296	0.664	1.34
	3^rd quartile	20	-0.131	0.787	0.88
	4^th quartile	22	0.000	0.000	1.00
Calf birth weight		98	0.069	0.063	1.07	1.35	0.25
Calf birth weight	1^st quartile	21	-0.280	0.706	0.76	7.48	0.06
	2^nd quartile	29	-1.983	0.948	0.14
	3^rd quartile	23	0.003	0.598	1.00
	4^th quartile	25	0.000	0.000	1.00
Calf gender	Male	56	0.115	0.437	1.12	0.07	0.79
	Female	56	0.000	0.000	1.00
Natural logarithm of onset of luteal activity		110	-1.003	0.537	0.37	3.58	0.06
Natural logarithm of previous calving interval		89	2.220	2.697	0.11	0.77	0.38
Maternal breeding value		107	0.032	0.026	1.03	1.45	0.23
Maternal breeding value	1^st quartile	26	-1.674	0.751	0.19	6.50	0.08
	2^nd quartile	33	-0.001	0.550	1.00
	3^rd quartile	22	-0.969	0.691	0.38
	4^th quartile	26	0.000	0.000	1.00
Parity	1^st	26	-0.443	0.619	0.64	1.20	0.55
	2^nd	19	0.475	0.613	1.61
	>2^nd	71	0.000	0.000	1.00

ISSN: 1751-0147