title: Effect of reproductive disorders and parity on repeat breeder status and culling of dairy cows in Quebec.
abstract: This study quantified the effect of peripartum reproductive disorders and parity on repeat breeder status and involuntary culling of dairy cows. Reproductive data of 418 383 lactations were taken from a computerized databank of health records for dairy cows. A logistic regression model was used with dystocia, retained placenta (RP), metritis complex, and parity as fixed effect risk factors and herd entered as the random effect. Of the peripartum problems studied, dystocia had the greatest effect on future fertility. Dystocia increased the odds of a cow being a repeat breeder by 44% [odds ratio (OR): 1.44; confidence interval (CI): 1.37 to 1.51]. Compared to first-parity cows, cows in second, third, and fourth parities had significantly higher odds of being a repeat breeder: 18% (OR: 1.18; CI: 1.16 to 1.20); 24% (OR: 1.24; CI: 1.21 to 1.26); and 42% (OR: 1.42; CI: 1.39 to 1.45), respectively. The odds for second-, third-, or fourth-parity repeat breeders being culled were 24% (OR: 1.24; CI: 1.20 to 1.28); 39% (OR: 1.39; CI: 1.35 to 1.43); and 67% (OR: 1.67; CI: 1.62 to 1.71) respectively, while peripartum reproductive problems had less of an effect.
authors: Department of Clinical Sciences, Faculty of Veterinary Medecine, Université de Montréal, St-Hyacinthe, Quebec J2S 7C6. ariane.bh@hotmail.com
authors: Ariane
authors: A
authors: Bonneville-Hébert
authors: Emile
authors: E
authors: Bouchard
authors: Denis Du
authors: DD
authors: Tremblay
authors: Réjean
authors: R
authors: Lefebvre
mesh_terms: D000818:Animals; D001947:Breeding; D002417:Cattle; D002418:Cattle Diseases / Q000503:physiopathology*; D003612:Dairying; D004420:Dystocia / Q000503:physiopathology / Q000662:veterinary*; D004716:Endometritis / Q000503:physiopathology / Q000662:veterinary; D005260:Female; D016015:Logistic Models; D016017:Odds Ratio; D010298:Parity; D018457:Placenta, Retained / Q000503:physiopathology / Q000662:veterinary*; D011247:Pregnancy; D011792:Quebec / Q000453:epidemiology; D012189:Retrospective Studies; D014591:Uterine Diseases / Q000503:physiopathology / Q000662:veterinary*