Ciclicidade em femêas bubalinas (Bubalus bubalis) nas estações reprodutivas

Abstract

It is believed that the reproductive performance of buffaloes is more influenced by environmental factor than genetic factors, so a good nutritional condition is also fundamental to obtain a good reproductive performance. The goal of this study was to evaluate the cyclicity of female buffaloes (Bubalus bubalis), the pregnancy rate obtained in the breeding seasons, as well as to correlate the body condition score with the ovarian score observed in female buffaloes. The study was conducted in a rural property in the municipality of Arari – MA , which is a micro region of the Baixada Maranhense, was chosen. The study was divided into two stages, the first during the month of January / 2016 and the second during the month of July / 2016, periods characterized as unfavorable and favorable to the reproduction of buffalo, respectively. A total of 205 buffaloes (Bubalus bubalis) of the Murrah breed, multiparous and non-lactating, were evaluated. The ECO (ovarian condition score) evaluation was performed using B-mode ultrasonography, where the status was determined by classifying the scores in 01 (presence of CL or corpus luteum), 02 (absence of CL and presence of follicles ≥ 8.5) and 03 (absence of CL and presence of follicles <8.5), respectively. The ECC (body condition score), ECO and pregnancy rate were also evaluated. It can be observed that ECO 01 was predominant during the favorable season, and ECO 02 was predominant during the unfavorable season. The ECO 3 was similar during unfavorable and favorable seasons. The ECO 1 during unfavorable season was 75% (6/8) when the ECC was ≥ 3, on the other hand, during the favorable season it was 67, 9% (19/28) when the ECC was <3.ECO 2 was predominantly observed during unfavorable season for ECC <3, 48.9% (22/45) and for ECC ≥ 3, 51.1% (23/45). There was a significant difference in the pregnancy rate between favorable and unfavorable seasons (41.20% vs. 27.80%, respectively, for P <0.05). Thus, it was possible to observe that there was a concentration of the reproductive activity of female buffaloes (Bubalus bubalis), with predominance of ECO 1 in the favorable reproductive season.