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In order to evaluate the efficiency of two treatments for the induction of estrus in dairy cows of the central region of Cuba, and the factors that affect it, this experiment in the rainy period of the year 2013, was carried out. 174 cows from 6 to 8 years old were selected, with a longer than 60 days voluntary waiting period and a body condition score (BCS) ranging from 2.5 to 4 (scale of 1-5). Two groups were conformed, one of 90 animals receiving P4 (90 mg) + P4 (60 mg) + P4 (60 mg) + BE2 (1 mg)] and another one of 84, which were treated with P4(3) + eCG [P4 (90 mg) + P4 (60 mg) + P4 (60 mg) + eCG (500 UI)]. To determine the factors that affect the response to the induction of estrus, a model of logistic regression was applied, comparing the proportions of presentation of heat and pregnancies between treatments by means of binomial comparison of proportions and according to the BCS within each hormonal protocol intervening multiple comparison of proportions. There were not differences (p>0.05) between treatments for the presentation of estrus, on the contrary, the proportions of gestations at the first service were better (p<0.05) with the treatment P4(3) + eCG. In both treatments, the greatest percentages of pregnancies in the first service, and total in cows with a higher or similar BCS to 4 are achieved (p<0.05). It is concluded that the most effective treatment was P4(3) + eCG and BCS had influence on the efficacy of the treatments significantly.

Eficacia de dos tratamientos hormonales para la inducción del celo en la vaca lechera