Evaluación de Diferentes Métodos de Sincronización del Celo en Vacas Lecheras en la Provincia de Pastaza

Abstract

At the dairy cattle herds of Puyo Canton, Pastaza Province, the induction and synchronization in crossbred cows based on three hormonal protocols and artificial insemination at a fixed time (IATF), to be compared to the control treatment. The experimental treatments were T1: Implant Progesterone + stradiol cipionate + PGF20 + PMSG + Ngr. Implant; T2: Implant P4 + stradiol cipionate + PGF20 + stradiol cypionate, T3: Implant P4 + stradiol cipionate + PGF20 + Ngr. and T4: control treatment (estrous detection and Al). For this a sample of 40 cows, 10 per treatment and distributed under a DCA, were used; each animal was an experimental unit. The experimental results were subjected to the variance analysis and mean separation through the Duncan's test (Prob. <0.05 and <0.01). It was determined that the hormone protocols influenced neither on the weight gain nor on the final body condition, reaching between 3.0 and 3.5 points in the 1 to 5 scale. The conception rate of the control group cows was 50%, which is surpassed upon applying the hormone treatments, and among these the best responses were reached with treatment T3 with 80% conception, this is why it is recommended to carry out the estrous synchronization and the use of IATF, with treatment T3.