Evaluación de la reutilización de un dispositivo liberador de progesterona (CIDR) en la inducción de celo y la ovulación en vacas Holstein.

Abstract

The present research was made to evaluate the reuse of a progesterone- releasing device (PRID) in estrus and ovulation in cows, to offer an option to the population of small producers of Guaranda, Bolivar. For this purpose, a quantitative study was designed as a methodology applied to three experimental groups of 10 units of different hormonal treatments, each one being T1 (new), T2 (second use), and T3 (third use). The valuation indicators of the treatments to be evaluated were: (C.C, ovulation time, estrus, and pregnancy). For the ovulation time and body condition variables, the (Completely Lazarus Design)was used, for ovulation time a statistical difference was observed (p≤0.05; for body condition, it could be observed that there was no statistical difference (p≥0.05) while for the pregnancy rate and estrus presentation variables, chisquare of the goodness of fit was used. Groups T1, T2, and T3 presented homogeneous conditions in terms of the indicators, proceeding with the experimentation, obtaining the ovulation time variable, there was a more excellent estrus presentation with group T3 than with T1 and T2; the c. c for treatments T1, T2, and T3 at 35 days evaluated was homogeneous; the heat presentation in T1 and T2 was 80%-70% respectively, however, for group T3 there was 30% of heat presentation. Finally, with the pregnancy rate, greater effectiveness was recognized in groups T1 and T2 with 80% and 60% of pregnancies, compared to 20% in group T3. At the economic level, it was determined that the device presents profitable results with a single (second use), concluding that the cost-benefit relation adjusted to the investment capacities of the small producers of the Bolivar province.