Veterinary Medicine International / 2011 / Article / Tab 3

Review Article

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].

ItemOvulation rateConception ratePregnancy rate

Study 1-eCG to replace T
 Control81.9% (181/221)50.8% (92/181)41.6% (92/221)
 eCG30080.8% (168/208)57.7% (97/168)46.6% (97/208)
 eCG40083.9% (187/223)64.7% (121/187)54.3% (121/223)
 TW86.6% (207/239)59.4% (123/207)51.5% (123/239)
Study 2-FSH to replace eC
 TW41.9% (83/198)
 eCG400 43.3% (81/187)
 Folltropin34.3% (74/216)
 Pluset32.1% (36/112)
Study 3-eCG associated with T
 TW88.9% (264/297)158/264 (59.8)53.2% (158/297)
 TW + eCG20093.0% (278/299)155/278 (55.7)51.8% (155/299)
 TW + eCG40090.0% (261/291)152/261 (58.2)52.2% (152/291)

Cows 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 ( ).
Cows 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 ( ).
Cows 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 ( ).

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