Table 2.

Distribution (%) of calving ease, stillbirths and placental expulsion in respect of investigated factors

Trait	Level	Calving ease				Stillbirths		Placental expulsion
		1	2	3	4	1	2	1	2	3
Calving season	Fall-winter	66.67	21.11	8.89	3.33	95.33	4.67	70.44	19.11	10.44
	Winter-spirng	55.51	24.25	13.43	6.81	92.99	7.01	62.53	22.04	15.43
	Summer	62.66	24.03	7.14	6.17	92.53	7.47	64.29	22.73	12.99
Successive calving	First	45.25	30.28	15.85	8.63	91.90	8.10	66.73	25.00	8.27
	Second	68.88	20.82	7.09	3.20	94.51	5.49	65.90	17.39	16.70
	Third	84.13	10.71	3.17	1.98	96.43	3.57	63.49	19.05	17.46
Calf sex	1 (heifer calves)	63.34	23.99	8.95	3.72	95.61	4.39	70.10	21.28	8.61
	2 (bull calves)	59.40	22.26	11.43	6.92	92.03	7.97	61.95	21.05	16.99
Husbandry system	1 (tie-stall)	54.82	26.76	11.37	7.05	92.23	7.77	70.36	19.57	10.07
	2 (free-stall)	69.22	18.51	8.90	3.38	95.55	4.45	60.14	23.13	16.73