Evaluación de la efectividad del acetato de bucerelina vs. acetato de deslorelina para sincronización de celo en yeguas mestizas.

Abstract

The main aim of this research is to evaluate the ovulation time, ovulatory follicle size, follicular growth, ovulated ovary, and pregnancy in crossbred mares of the Equine Academic and Research Unit, belonging to the “Tunshi” Experimental Station, Faculty of Animal Sciences of the School Superior Polytechnic of Chimborazo, located at km 12 of the Riobamba-Licto highway, Chimborazo province. The effects of two treatments were evaluated against the control, which was applied under a completely random design. Treatment T0 was the control group, treatment T1 with buserelin acetate, and treatment T2 with deslorelin acetate, with four repetitions each. The search used 12 mares per experimental unit, with an average weight of 429.5 kg. The results did not report significant differences (P>0.05). However, there were numerical differences between the means of the treatments studied. The shortest ovulation time was recorded by the T1 treatment belonging to buserelin acetate with an average of 9.5 hours after the application; The largest ovulatory follicle size was also reported by buserelin acetate with an average size of 45 mm; the T2 treatment corresponding to deslorelin acetate presented the highest rate of follicular growth with an average of 3.67 mm; The T1 treatment also stood out in the highest percentage of pregnancy, reporting 100%; In ovarian function, the left ovary presents a higher frequency of ovulation with 60%. The use of buserelin acetate positively influenced the variables analyzed. Therefore its application was recommended for heat synchronization in mares because it allows us to obtain a shorter ovulation time, ideal follicular growth, and the highest percentage of pregnancy.