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

Table 3 Univariate relationships between natural logarithm of days open and studied variables

Variable	Group	n	β-value	SE	F-value	P-value
Calf 200-d weight		81	-0.003	0.001	5.49	0.02
Calf 200-d weight	1^st quartile	21	0.286	0.100	3.14	0.03
	2^nd quartile	22	0.151	0.099
	3^rd quartile	19	0.250	0.113
	4^th quartile	19	0.000	0.000
Calf birth weight		91	-0.008	0.010	0.56	0.46
Calf birth weight	1^st quartile	20	0.034	0.129	1.83	0.15
	2^nd quartile	27	-0.206	0.114
	3^rd quartile	23	-0.070	0.125
	4^th quartile	21	0.000	0.000
Calf gender	Male	51	-0.005	0.080	0.00	0.95
	Female	54	0.000	0.000
Luteal phase pattern	Normal	84	-0.342	0.085	16.34	0.001
	Irregular	24	0.000	0.000
Luteal phase pattern	Other	96	-0.290	0.114	6.42	0.01
	Prolonged	12	0.000	0.000
Natural logarithm of onset of luteal activity		103	0.162	0.081	3.96	0.05
Natural logarithm of previous calving interval		78	-0.452	0.440	1.06	0.31
Maternal breeding value		100	-0.009	0.004	5.09	0.02
Maternal breeding value	1^st quartile	24	0.267	0.096	3.10	0.03
	2^nd quartile	32	0.221	0.086
	3^rd quartile	21	0.188	0.091
	4^th quartile	23	0.000	0.000
Parity	1^st	23	0.231	0.095	3.82	0.03
	2^nd	19	-0.101	0.106
	>2^nd	67	0.000	0.000

ISSN: 1751-0147