Informe final de pasantía profesional en la empresa Suministros Veterinarios y Genética. Evaluación del uso de dos ésteres de estradiol en el porcentaje de preñez en vacas multiparas en un protocolo de sincronización de la ovulación.

Abstract

The following study was aimed to evaluate two formulations of estradiol E2 estradiol benzoate (BE) and estradiol Cypionate (CE) in multiparous cows at a farm in Ceiba from the municipality of San Alberto in the state of Cesar. The type of sampling that was applied was non-probabilistic with sample selection with criteria of exclusion. One hundred fifty (150) mixed breed cows of double purpose (Bos taurus by Bos indicus) were selected, close to birth) of (50±15) days postpartum and with an average of (4±2) births each one. For the application of the treatments, three groups G1, G2 and G3 were randomly classified, each group made up of 50 cows. In turn, each group was divided into two groups of 25 each for a total of 6 sample subgroups. On day 0 all of the cows received a DIB along with 2 mg of EB. On day 8, the DIB were removed and the cows received a dose of 150 ug of PGF2, plus 400 U.I of eCG (Folligon). Half of the cows received 1 mg of CE on Day 8 of the treatment (BE 0h) and the other half 1 mg of BE on Day 9 (BE 24h). Subsequently the IATF on Day 10 was achieved, 54 to 56 h after the removal of the DIB. All of the cows were examined by ultrasonography on day 40 post insemination. The date was analyzed by means of the statistical technique ANOVA, with a significance level of 5% and the statistical software that was used was SPSS, EXCEL and STATISTIX 10.0. The obtained results did not lead to reject the null hypothesis, no significant difference (P-value>0.05) in the number of pregnant cows or by treatment or per group were observed, therefore, one can use the protocol benzoate plus cypionate to avoid the confinement of animals without affecting the pregnancy rate.