QUALITATIVE ASPECTS OF OOCYTES FROM NELORE AND SENEPOL BREEDS REARED IN A TROPICAL REGION

Abstract

The objective of this work was to evaluate the influence of the tropical climate on donor races on the quantity and quality of oocytes aspirated in Nellore and Senepol cows by means of follicular aspiration, destined to the in vitro production of embryos. The experimental design was in randomized blocks, considering each bovine female as a plot and each farm being a block totaling 14 different properties, and the number of cows used were 238 for the Nelore breed and 267 for the Senepol breed totaling 505 bovine females. The evaluation of the total number of oocytes and the quality by the quality classification of oocytes aspirated in Grade I, II, III, atresic and degenerate. According to the results we can conclude that, among the two races evaluated, a greater amount of GII oocytes is observed for the Nelore breed, and the Senepol breed in tropical climate can produce a good quantity and quality of oocytes, with the lowest amount of nude in relation to the Nelore.