Evaluación de tres métodos de sincronización de estro e inseminación artificial en vacas mestizas lecheras en la parroquia El Altar.

Abstract

In El Altar parish, belonging Penipe canton, Chimborazo province, three methods of estrus synchronization and artificial insemination were evaluated in mixed dairy cows, for which 18 cows were used, distributed in different estrus synchronization protocols, P1 (PF2α PF2α), P2 (GnRH PF2α) and P3 (PF2α Gonadotropin ECG), with 6 repetitions each giving us a total of 18 experimental units, each made up of a cow. The experimental design applied was the completely simple random design, with a bifactorial arrangement 3 x 2; three protocols of estrus synchronization (factor A) and number of lactations (factor B) with six repetitions for each treatment, the duration of this research methodology was 90 days. As a result, in protocols P2 and P3, all cows presented heat within 24 and 48 hours after the application of each protocol, with protocol P1, three cows out of six presented heat. Of the three protocols of estrus synchronization, the most effective were P2 (GnRH PF2α) and P3 (PF2α + Gonadotropin) with 100 % of pregnancy, higher than P1 (PF2α PF2α) with 50%; in addition, with protocols 2 and 3, the lowest costs per cow/pregnant woman were obtained with 69,83$ and 71,52$, respectively. The preliminary data obtained included protocol 2 (GnRH PF2α). The cows being studied must be free of reproductive pathologies, nutritional complications, the standard permitted body condition variable 2,5 – 3 must be taken into account.