OVARIAN ACTIVITIES IN BUNAJI COWS SLAUGHTERED DURING THE DRY SEASON AT THE ZARIA ABATTOIR, KADUNA STATE,

Authors

  • Egbodo, B. E. National Animal Production Research Institute, Ahmadu Bello University, Shika-Zaria,
  • Ate, I. U. Department of Theriogenology and Production, Faculty of Veterinary Medicine, Ahmadu Bello University, Zaria-Nigeria
  • Omontese, B. O. National Animal Production Research Institute, Ahmadu Bello University, Shika-Zaria,
  • Oke, P. O. Department of Parasitology and Entomology, College of Veterinary Medicine, Federal University of Agriculture Makurdi-Nigeria
  • Samuel. F. U. National Animal Production Research Institute, Ahmadu Bello University, Shika-Zaria,
  • Bello, T. K. National Animal Production Research Institute, Ahmadu Bello University, Shika-Zaria,
  • Hassan, R. National Animal Production Research Institute, Ahmadu Bello University, Shika-Zaria,

Keywords:

Bunaji cows, Ovarian activity, dry Season

Abstract

A total of one hundred and sixty ovaries (80 left and 80 right from 80 Bunaji cows slaughtered
at Zaria abattoir, Kaduna State, during the dry season (March to May) were examined grossly
for follicular and luteal structures. The findings were used to ascertain ovarian activity of these
Bunaji cows before slaughter. Follicules were characterized on the basis of diameter: small (1-4
mm), medium (5-8 mm) and large (?9 mm) while luteal structures were characterized on the
basis of morphology: corpus haemorrhagicum (CH), corpus luteum (CL) and corpus albicans
(CA). Presence of CL was indicative of cyclicity while abnormal ovarian function was
described as the presence of one or more CA and follicular growth without a CL. Cows without
luteal structures in the ovaries and complete absence of follicles were regarded to be in
anoestrous. Cows with no CL in any of its ovaries were regarded as prepubertal heifers
irrespective of the presence of follicular structures. Out of the eighty cows sampled, seventynine (98.75%) had functional structures indicative of present or past ovarian activity. Twentythree (29.0%) were cycling, forty-one (51.0%) showed abnormal ovarian activity, one (1%) was
in anoestrus and fifteen (19.0%) were pre-pubertal heifers. The results of this study show that
fewer number of Bunaji cows continue to cycle despite the dry season effect which
characterized by a lack of rainfall and low quality of pastures.

Published

2015-12-30