Veterinary Medicine International / 2011 / Article / Tab 5

Review Article

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

Table 5

Ovulation, conception, and pregnancy rates of Bos indicus pubertal heifers (Study 1) and nonlactating cows (Study 2) submitted to a synchronization of ovulation protocol using progesterone associated with estradiol having different strategies to improve fertility. Adapted from Peres et al. [53].

ItemOvulation rateConception ratePregnancy rate

Study 1-CIDR uses and eC
 CIDR 1st use/0 IU eCG84.3% (161/191)49.1% (79/161)41.4% (79/191)
 CIDR 1st use/200 IU eCG89.9% (169/188)51.5% (87/169)46.3% (87/188)
 CIDR 1st use/300 IU eCG94.6% (177/187)52.0% (92/177)49.2% (92/187)
 CIDR 3rd use/0 IU eCG83.4% (176/211)49.4% (87/176)41.2% (87/211)
 CIDR 3rd use/200 IU eCG87.2% (170/195)54.7% (93/170)47.7% (93/195)
 CIDR 3rd use/300 IU eCG93.9% (170/185)47.1% (80/170)44.2% (80/181)
Study 2-Time of PGF2 treatment and eC
 PGF2  d 7/0 IU eCG80.3% (143/178)59.4% (85/143)47.7% (85/178)
 PGF2  d 7/300 IU eCG90.7% (156/172)62.1% (97/156)56.4% (97/172)
 PGF2  d 9/0 IU eCG64.4% (112/174)42.0% (47/112)27.0% (47/174)
 PGF2  d 9/300 IU eCG89.3% (159/178)50.9% (81/159)45.5% (81/178)

Pubertal heifers received a nonpreviously used CIDR (1st use) or a CIDR used previously for 18 d (3rd use) at initiation of a TAI protocol, and 0, 200, or 300 IU of eCG on d 9 relative to CIDR insertion, in a factorial design. There were effects of eCG treatment on ovulation, conception, and pregnancy rates ( ).
Nonlactating cows were treated with 12.5 mg of dinoprost tromethamine on d 7 (48 h before CIDR withdrawal; PGF2  d 7) or on d 9 (immediately after CIDR withdrawal; PGF2  d 9), and 0 IU of eCG or 300 IU of eCG on d 9 of an ovulation synchronization protocol. There were effects of time of PGF2 treatment on ovulation, conception, and pregnancy rates ( ); eCG affected ovulation and pregnancy rates ( ).

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