Author/Authors :
AI-Mustafa، Ahmed H. نويسنده , , Javed، K. نويسنده Department of Livestock Production, University of Veterinary and Animal Sciences, Lahore-Pakistan , , Abdullah، M. نويسنده Department of Livestock Production, University of Veterinary and Animal Sciences, Lahore-Pakistan , , AHMAD، N. نويسنده , , Ajmal، A. نويسنده Department of Livestock Production, University of Veterinary and Animal Sciences, Lahore-Pakistan ,
Abstract :
Present study was carried out on some reported repeat breeder individuals (n=08) of nondescript cows at Para-veterinary hospital, University of veterinary and Animal Sciences, Ravi Campus, Pattoki. Nondescript cows has major share, which is approximately 70% in cattle farming in Pakistan. Chromosomal preparations were made using blood culture from animals under study. About 50 metaphase spreads were screened to detect the chromosomal aberrations and prepare the karyotype. The results showed that the percent of total numerical aberrations for repeat breeder group was 19.95%, while the percent of total structural aberrations were predominant and reached 62%. These results concluded that cytogenetic studies should be used as a diagnostic tool to determine the causes of low reproductive efficiency.
