Evaluación del nivel de LH plasmático en diferentes protocolos de sincronización del estro para inseminación artificial a tiempo fijo en vacas lecheras Brown Swiss Mestizas.

Abstract

Evaluation of plasma lh level in different protocols for timing estro artificial insemination fixed time brown swiss crossbred dairy cows in the farmer "SAN ANTONIO" located at km 10 way to Misahualli, Canton Tena Napo Province. The effect of different estrus synchronization protocols for a Fixed Time Artificial Insemination was evaluated in crossbred Brown Swiss cows to determine plasma levels of LH and related cup design features. Using the experimental scientific method the distribution of treatments were completely randomized and the usage of Experimental Design was not needed. It was analyzed crossbred Brown Swiss cows, and with the help of reproductive / productive registration and health record, different variables were determined during 120 research days. The results had shown that higher plasma LH profiles and percent conception rate were identified in treated cows Norgestomet - GnRH , with 31.42 ng / ml and 100% respectively. As conclusion, there is possible the use of Norgestomet - GnRH for estrus synchronization for Artificial Insemination at Fixed Time in crossbred Brown Swiss cows , because the best reproductive parameters were found , as well the best economic returns with a value of benefit - cost of $ 1244. Therefore it is recommended to apply the treatment Norgestomet - GnRH in estrus synchronization protocols for fixed-time artificial insemination in cows , in order to raise the profile of LH before ovulation. The corpus luteum quality and conception rate also were improved. It is recommended also to disseminate the results at the level of dairy farming, with the aim of increasing bovine fertility consequently to obtain higher economic returns for producers.