Cytogenetic Studies Related to Some Reproductive Disorders in Cattle

The present study was carried out to show the differentchromosomal aberrations associated with repeat breeder, anestrum,freemartinism, retained placenta, vaginal prolapse and habitual abortion inHolstein-Friesian cattle.A total 90 healthy Holstein-Friesian cows aged form 3-8 years andweighing form 300-800 kg from different farms located at El-Sharkiaprovince. The animals were classified into 7 groups as follows:-Group A: - Consists of 20 normal cyclic cows and showing normalreproductive history.Group B: - Consists of 22 Holstein - Friesian lactating cowssuffering from ovarian follicular cysts with a history of repeat breedersGroup C: - Consists of 18 Holstein - Friesian lactating cowssuffering from luteal cysts with a history of anestrum.Group D: - Consists of 8 Holstein - Friesian heifers which born Co-twin to male.Group E: - Consists of 10 Holstein - Friesian cows affected withretained placenta.Group F: - Consists of 8 Holstein - Friesian cows suffering fromfrequently prolapsed vagina.Group G: - Consists of 4 Holstein-Friesian heifers suffering fromhabitual abortion.