Veterinary Medicine International / 2011 / Article / Tab 2

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].

ItemOvulation rateConception ratePregnancy rate

Study 1-PGF2 dosag
 Half-dose88.7% (110/124)69.2% (76/110)61.3% (76/124)
 Full-dose 94.4% (119/126)68.2% (81/119)64.3% (81/126)
Study 2-Ovulatory stimulu
 ECP89.5% (282/315)56.7% (160/282)50.8% (160/315)
 EB90.9% (289/318)57.1% (165/289)51.9% (165/318)
 GnRH91.0% (284/312)59.5% (169/284)54.2% (169/312)
Study 3-CIDR use
 CIDRn91.7% (496/541)56.0% (278/496)51.4% (278/541)
 CIDR9d90.6% (482/532)59.3% (286/482)53.8% (286/532)
 CIDR18d90.1% (373/414)55.8% (208/373)50.2% (208/414)
Study 4-CIDR use
 CIDRn79.7% (55/69)54.5% (30/55)43.5% (30/69)
 CIDR9d80.0% (144/180)61.1% (88/114)48.9% (88/180)
 CIDR18d83.9% (188/224)60.1% (113/188)50.4% (113/224)
 CIDR27d85.7% (90/105)57.8% (52/90)49.5% (52/105)

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 ( ).

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