Veterinary Medicine International / 2011 / Article / Tab 1

Review Article

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

Table 1

Percentage of cows inseminated (first 3 d and 25 d of breeding season), conception (first 3 d and from d 4 to 25 of breeding season) and pregnancy rates (first 3 d, 25 d, and in 80 d of breeding season) in anestrous Nelore (Bos indicus) Angus (Bos taurus) crossbred cows treated or not treated with an intravaginal insert containing 1.9 g of progesterone (CIDR) between days −7 to 0 of breeding season and/or 48 h temporary weaning (TW) between d 0 and 2 of breeding season. Adapted from Vasconcelos et al. [4].

Dependent variableWithout CIDRWith CIDR
Without TWWith TWWithout TWWith TW

% cows inseminated 2.7% (2/73)48.6% (34/70)17.8% (13/73)41.4% (29/70)
Conception 50.0% (1/2)8.8% (3/34)46.1% (6/13)58.6% (17/29)
Pregnancy rate 1.4% (1/73)4.3% (3/70)8.2% (6/73)24.3% (17/70)
Conception (4–25 d)50.0% (7/14)16.7% (2/12)50.0% (4/8)60.0% (3/5)
% cows inseminated 21.9% (16/73)60.0% (42/70)28.8% (21/73)48.6% (34/70)
Pregnancy rate 10.9% (8/73)7.1% (5/70)13.7% (10/73)28.6% (20/70)
Pregnancy rate (80 d)58.9% (43/73)65.7% (46/70)61.6% (45/73)58.6% (41/70)

CIDR ( ); TW ( ); CIDR TW ( ).

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