Abstract

The effects of genetic and non genetic factors on the number of ovarian follicles and oocyte yield and quality in the bovine local breed (Oulmes Zaer), exotic breeds and their crosses in Morocco was investigated. In this study, females in very bad body conditions (BCS < 2) were not slaughtered and the average. The body condition scores (BCS) was 2.94 ± 0.89. Although some individual values were out of the normal ranges, mean values  of  total  proteins,  albumin,  urea,  β-OH and GOT remain normal and were 77.83 ± 8.74 g/l,  32.4 ± 4.41g/l, 4.43 ± 2.13 mmol/l ,  0.83±  0.48 mmol/l et  45.55 ± 11.95 UI/l, respectively. The mean number of ovarian follicles per cow (2-8 mm) was high (22.98 ± 8.41) whereas the oocyte yield (and 2.60 ± 1.53) was very low. The effects of genetic group, age and BCS on the number of follicles, oocyte yield and the quality were significant.

Key words: Cows, follicular population, oocyte yield and quality.