Utilización de dispositivos intravaginales (CIDRO) en un programa de inseminación a tiempo fijo en vacas lecheras en distintos pisos climáticos de la sierra norte

Abstract

In different dairy farms in the Northern Sierra of the country, located in different climatic zones (Santa Teresita 2721.3 m.a.s... La María m.a.s.I., San Isidro 2848,7 m.a.s.l., and Ingueza 3045,9 m.a.s.l), the pregnancy rate in dairy cows was evaluated by effect of estrus synchronization with new and used CIDR devices, using 10 repetitions per treatment, with one animal as the experimental unit and chosen randomly of the dairy cows that were in lactation stage. The experimental data were analyzed using the Chi-square (X2). for two variables and the Independence Test, in order to determine the independence or not of the CIDR VS. Climatic zones. Establishing that the use of intravaginal CIDR devices, new or used showed statistically similar responses, although numerically a slight superiority was observed with the use of new CIDR. The differences between the responses are determined by climatic zones where the farms are, obtaining better results on an altitude of 2721.3 m.a.s.l. Lower costs per pregnant cow (76.03 and 75.95 dollars), were determined in cows that are at 2721,3 m.a.s.l. and at 3045.9 m.a.s.l., these costs were 117.39 and 151,84 dollars instead; therefore it is recommended the estrus synchronization with the use of new or used CIDR because similar results were obtained in pregnancy rate.