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 variable	Without CIDR		With CIDR
	Without TW	With TW	Without TW	With TW
% cows inseminated (3d)^bc	2.7% (2/73)	48.6% (34/70)	17.8% (13/73)	41.4% (29/70)
Conception (3d)^ac	50.0% (1/2)	8.8% (3/34)	46.1% (6/13)	58.6% (17/29)
Pregnancy rate (3d)^ab	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 (25d)^b	21.9% (16/73)	60.0% (42/70)	28.8% (21/73)	48.6% (34/70)
Pregnancy rate (25d)^ac	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)

aCIDR (𝑃<.05); bTW (𝑃<.05); cCIDR × TW (𝑃<.05).