Screening of Breeding Bulls of Different Breeds through Karyotyping
نویسندگان
چکیده
A study of chromosomal analysis for 200 breeding bulls of different breeds of cattle (Jersey, Holstein Friesian, Sahiwal and Cross-bred) and Nili-Ravi buffalo, maintained at Semen Production Unit, Qadirabad and Livestock Experiment Station, Bhunikey (Pattoki) was carried out. Micromethod was adopted for leukocyte culture and chromosomes were trapped at metaphase stage. The diploid number of chromosomes in all breeds of cattle was found to be 60 (58 autosomes and 2 sex chromosomes: XY), while this number in Nili-Ravi buffalo bulls was 50 (48 autosomes and 2 sex chromosomes: XY). All the autosomes and sex chromosomes in males of both species were found normal.
منابع مشابه
Puberty in beef bulls: acrosome morphology and semen quality in bulls of different breeds.
Semen characteristics were evaluated every 2 wk from 7 through 13 mo of age in 31 beef bulls representing six breed groups (Hereford, Angus, Hereford x Angus crossbreeds, Angus x Hereford crossbreds, Red Poll and Brown Swiss). Breeds differed in age at puberty, defined as the age at which an ejaculate was first obtained that contained a minimum of 50 x 10(6) total spermatozoa with at least 10% ...
متن کاملGrowth and pubertal development in Brahman-, Boran-, Tuli-, Belgian Blue-, Hereford- and Angus-sired F1 bulls.
Growth and testicular development between 7 and 15 mo of age were evaluated in bulls produced by mating sires of six breeds (Hereford, Angus, Belgian Blue, Brahman, Boran, and Tuli) to Angus, Hereford, and MARC III (four-breed composite) cows. At 12 mo of age, Angus- and Hereford-sired bulls had the heaviest body weight (P < 0.08 to 0.001), whereas Brahman- and Belgian Blue-sired bulls were int...
متن کاملBreeding performance of bulls assigned either to 40 cows per bull or 80 cows per two bulls during the breeding period.
The reproductive performance of Angus (A), Polled Hereford (PH) and Santa Gertrudis (SG) bulls was compared when exposed to 40 cows/bull vs 80 cows/two bulls during a 90- to 95-d breeding period on pasture. Cows were A, PH and SG straightbreds and crossbreds of these breeds. Each year, cows were allotted at random within breed composition and age of dam to breeding groups. A replicate consisted...
متن کاملIncidence of bovine leukocyte adhesion deficiency carrier in breeding sires of West Bengal
Bovine leukocyte adhesion deficiency (BLAD) is a genetically transmitted disease and inherited as an autosomal recessive defect. Keeping this in view the present study was conducted to estimate incidence of carrier animals in a herd of breeding bulls for mutation in Integrin â2 gene, reared at Frozen Semen Bull Station (FSBS), Haringhata, Nadia, West Bengal, India. A total of 80 bulls of differ...
متن کاملGene flow in a national cross-breeding beef population.
Future progress in genetic improvement and the monitoring of genetic resources in beef cattle requires a detailed understanding of the population under selection. This study examines the gene flow in the UK beef population with an uncommon breeding structure involving interaction between the beef and dairy populations. British Cattle Movement Service records were used as the primary source of i...
متن کامل