Fertility response of lactating dairy cows subjected to three different breeding programs under subtropical conditions

Beni-Suef University Journal of Basic and Applied Sciences

Table 3 Effect of interactions among season, breed, and breeding program on pregnancy rate in lactating dairy cows

Season × breed × synch protocol
Dependent variable: pregnancy rate
Season	Breed	Breeding protocol	Mean	SE	95% confidence interval
Season	Breed	Breeding protocol	Mean	SE	Lower value	Upper value
Cold	Holstein	PO	36.50^b	2.90	30.82	42.17
		G6G	38.10^b	2.53	33.13	43.06
		CIDR	37.45^b	2.84	31.87	43.04
	Simmental	PO	56.90^a	6.28	44.57	69.22
		G6G	54.41^a	5.80	43.03	65.80
		CIDR	38.18^b	6.45	25.52	50.84
Hot	Holstein	PO	28.33^b	4.37	19.76	36.90
		G6G	28.57^b	3.30	22.09	35.05
		CIDR	32.14^b	9.04	14.40	49.88
	Simmental	PO	31.03^b	8.89	13.60	48.47
		G6G	36.67^b	8.74	19.53	53.81
		CIDR	27.50^b	7.92	12.31	42.69

PO Presynch-Ovsynch protocol, CIDR controlled internal drug release, G6G gonadotropin of Presynch, 6 days later Gonadotropin of Ovsynch. Values with different superscript letters are significantly different (p < 0.05)