Indução da ciclicidade em receptoras de embriões equinos: busca por um manejo sustentável

Abstract

The horse productive chain has shown an expressive growth on the last years, besides, in function of athlletes horses raise, in which, require more careful, including the use of reproduction biotequiniques, that search the best animals. Within the years, the pregnancy rate in mare incresead, due to the use of several techniques, including the hormone usages as progesterone that can be efficient inducing the first ovulation of the year. The main of the study was investigate a sustentable management at the equine reproductive chain, using intravaginal progesterone implants, in mares in seasonal anestrous, aiming the first ovulation at reproductive season. Twenty two crossbreed mares were used, classified in two treatments: TI- animals with foliculius smaller or equal 20mmand T2- animals with foliculus bigger or equal 20mm, which received progesterone intravaginal dispositive. After seven days, the two groups were submited to daily ultrasounds exams to verify the follicular growth, the implants were withdrawn when the animals presented a foliculus bigger or equal 35mm, and one day after the implant withdraw, all the animals had induced ovulation. The datas were tabulated and analized using PROC GENMOD. The data showed that the percentage of animals that responded to the treatment and had a dominant follicle greater than 35 mm was significantly higher (P <0.05) in the animals of the T2 group (62.5%) than in the T1 group (28.5 %). According to the obtained results in this research, we can conclude that the progesterone dispositive usage, induces the cyclicity in equine receptors of embryos, and antecipated the first ovulation at the reproductive season, showing that this technique can make the management of maresmore efficient, productive and sustentable, at the economic and ambiental point of view.