Eficiência reprodutiva em éguas assintomáticas portadoras de Theileria equi submetidas a um programa de transferência de embrião

Abstract

This study aimed to evaluate the influence of babesiosis in embryo recovery rates, early pregnancy and embryonic loss. The project was carried out in a Central Commercial Embryo Transfer, located in the city of Itaguai, and two farms in the county of Seropédica-RJ, using animals from the same breed (Mangalarga Marchador). The 13 donors and 40 recipients used in this experiment were positive for Theileria equi confirmed by nested-PCR method . Two embryo collections were performed in donor mares in two consecutive estrous cycles (GID), in sequence these same animals were treated with imidocarb dipropionate (1.2 mg / kg IM.) in order to conduct two more embryo collections in two estrous cycles (GIId). The embryo recipients were divided into two groups of 20 animals each, where one was the control group (IRG), and the other group was treated (GIIr) with 1.2 mg / kg IM imidocarb dipropionate, with the aim of evaluating pregnancy rate at 15, 30, 45 and 60 days. The embryo donors mares had normal erythrocyte before and after treatment with imidocarb dipropionate. ConcerningWBC, the embryo donors showed a decrease in the count of total leukocytes and neutrophils after treatment and a slight increase of lymphocytes and monocytes after treatment. The embryo recipients showed normal erythrocyte and leukocyte counts before and after the treatment with imidocarb dipropionate. After 52 embryo collections performed, embryo recovery rate was 53.84% (14/26) and 65.38% (17/26) ( p> 0,05) for GID and GIId respectively. The pregnancy rate was 70% (14/20) ( p> 0,05) at 15, 30, 45 and 60 days in the Gir and the GIIr was 85% (17/20) ( p> 0,05) at 15 days, 80% (16/20) ( p> 0,05) at 30 , 45 and 60 days. Treatment with imidocarb dipropionate did not improve significantly the reproductive efficiency in an ET program.