Evaluación de dos protocolos de sincronización de celo en ovinos para la inseminación artificial a tiempo fijo

Abstract

The best protocol between an intravaginal device (Medroxyprogesterone acetate) _PMSG and GnRH_PGF2a_PMSG was determined. This research was carried out in the Sheep, Caprina and Camelids Academic Research Unit belonging to the Tunshi Experimental Station of the Escuela Superior Politécnica de Chimborazo, located in the Licto Parish, Riobamba canton, Chimborazo Province, by the means of an experimental methodology, under a Completely Random Design with a bifactorial arrangement, setting the protocols as factor A and sheep breeds as factor B, as well as using 2 treatments with 6 repetitions; the experimental unit consisted of 1 adult sheep with a duration of 120 days of research. When analyzing the variances in the percentage of presence of heat for the factor A, B, and the interaction (AxB), statistical differences were recorded at (P <0.05), among the treatment measures, obtaining for factor A the highest percentage when using the intravaginal device with 97.66%, unlike the hormonal protocol reaching 91.66%; regarding the factor B, the highest percentage occurred in the Corriedale race with 97.17% and the lowest in the Rambouillet breed with 92.17%, in the interaction the highest percentages registered the intravaginal device with 97.67% in both races. In terms of the number of services per conception, it was determined that 1 service per sheep was needed reaching a 100% biological fertility in the experiment. It is concluded that the best heat synchronization protocol is the intravaginal device that obtained a percentage of 97.66%, since it was not subjected to excessive stress to the sheep, compared to the second protocol that reached 91.66% for undergoing several injections that cause stress on the livestock. It is recommended to use animals with a Body Condition of 2.5 or the ideal of 3 since the reproductive parameters show better results.