Review Article
Treatments to Optimize the Use of Artificial Insemination and Reproductive Efficiency in Beef Cattle under Tropical Environments
Table 2
Ovulation, conception, and pregnancy rates of suckled Bos indicus cows submitted to a synchronization of ovulation protocol using progesterone associated with estradiol having different dosages of PGF2 (Study 1), ovulatory stimuli (Study 2), and uses of intravaginal progesterone insert (Study 3 and 4). Adapted from Meneghetti et al. [17].
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| Cows were treated with 12.5 mg (Half-dose) or 25 mg (Full-dose) dinoprost tromethamine on d 7 of a protocol using progesterone associated with benzoate estradiol. Progesterone devices were maintained between d 0 and 9, and fixed-time AI were performed on d 11. Ovulation was induced with estradiol benzoate administered on d 10. Dependent variables were not affected by PGF2 dosage (). Cows were treated with estradiol cypionate (ECP) on d 9, estradiol benzoate (EB) on d 10, or gonadotropin releasing (GnRH) hormone on d 11 relative to initiation of a protocol using progesterone associated with benzoate estradiol. Progesterone devices were maintained between d 0 and 9, and fixed-time AI were performed on d 11. Dependent variables were not affected by ovulatory stimulus (). Cows received a nonpreviously used CIDR (CIDRn), a CIDR used previously for 9 d (CIDR9d), a CIDR used previously for 18 d (CIDR18d), or a CIDR used previously for 27 d (CIDR27d) at initiation of the protocol. Dependent variables were not affected by CIDR type (). | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||