Bovine cystic ovarian disease: hereditary relationships and case study.
Cystic ovarian disease (COD) was studied in a closed 300-cow dairy herd, using Dairy Herd Improvement Association and individual health records for a 7-year period (1974-1980). There were 2,112 calvings by 649 cows during the period. Cysts were found in 130 cows. Of the 649 cows that calved, 110 (16.9%) produced at least 1 daughter in which COD developed. Two bulls sired 17.6% of the daughters with COD, which was more than anticipated inasmuch as they sired only 11.6% of all daughters (P less than 0.05). These bulls were removed from the breeding program in an attempt to reduce code in the herd.
D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology / Q000235:genetics*; D003430:Cross-Sectional Studies; D005260:Female; D007061:Idaho; D007774:Lactation; D010048:Ovarian Cysts / Q000453:epidemiology / Q000235:genetics / Q000662:veterinary*; D049590:Postpartum Period; D011247:Pregnancy