Treatments to Optimize the Use of Artificial Insemination and Reproductive Efficiency in Beef Cattle under Tropical Environments

Table 3

Ovulation, conception, and pregnancy rates of suckled Bos indicus cows submitted to a synchronization of ovulation protocol using progesterone associated with estradiol having different strategies to improve fertility. Adapted from Sá Filho et al. [18].

Item	Ovulation rate	Conception rate	Pregnancy rate
Study 1-eCG to replace TW^a
Control	81.9% (181/221)	50.8% (92/181)	41.6% (92/221)
eCG300	80.8% (168/208)	57.7% (97/168)	46.6% (97/208)
eCG400	83.9% (187/223)	64.7% (121/187)	54.3% (121/223)
TW	86.6% (207/239)	59.4% (123/207)	51.5% (123/239)
Study 2-FSH to replace eCG^b
TW	—	—	41.9% (83/198)
eCG400	—	—	43.3% (81/187)
Folltropin	—	—	34.3% (74/216)
Pluset	—	—	32.1% (36/112)
Study 3-eCG associated with TW^c
TW	88.9% (264/297)	158/264 (59.8)	53.2% (158/297)
TW + eCG200	93.0% (278/299)	155/278 (55.7)	51.8% (155/299)
TW + eCG400	90.0% (261/291)	152/261 (58.2)	52.2% (152/291)

aCows received no treatment (Control), 300 IU of eCG (eCG300), 400 IU of eCG (eCG400), or temporary weaning (48 h; TW) on d 9 relative to initiation of an ovulation synchronization protocol. Pregnancy rates were greater in eCG400 and TW treatments than in Control (𝑃<.05).
bCows received temporary weaning (48 h; TW), 400 IU of eCG (eCG400), 20 mg of Folltropin (Folltropin-FSH), or 20 mg of Pluset (Pluset-FSH) on d 9 relative to initiation of an ovulation synchronization protocol. Pregnancy rates were greater in eCG400 and TW treatments than in Folltropin and Pluset (𝑃<.05).
cCows received temporary weaning (48 h; TW), temporary weaning + 200 IU of eCG (TW + eCG200), or temporary weaning + 400 IU of eCG (TW + eCG400) on d 9 relative to initiation of an ovulation synchronization protocol. Dependent variables were not affected by treatments (𝑃>.10).