title: Interval from calving to conception in high producing dairy cows treated with recombinant bovine somatotropin.
abstract: Intervals from calving to conception in cows treated for two lactations with recombinant bST were ascertained using survival analysis methods. Daily intramuscular administration of placebo, 17.2, 51.6, or 86 mg of bST per cow started at d 70 postpartum and ended at culling or drying off. Breeding began at d 70 postpartum. Multiparous cows treated during the first lactation had significantly longer intervals from calving to conception. Cows treated during the previous lactation, but not during the second lactation, had significantly shorter intervals from calving to conception. Cox proportional hazards regression analysis was used with adjustment for the confounding effect of serum metabolites, milk production, energy balance, and body condition.
authors: Veterinary Medicine Teaching and Research Center, School of Veterinary Medicine, University of California, Davis 95616.
authors: E
authors: E
authors: Esteban
authors: P H
authors: PH
authors: Kass
authors: L D
authors: LD
authors: Weaver
authors: J D
authors: JD
authors: Rowe
authors: C A
authors: CA
authors: Holmberg
authors: C E
authors: CE
authors: Franti
authors: H F
authors: HF
authors: Troutt
mesh_terms: D000818:Animals; D002417:Cattle / Q000502:physiology*; D005260:Female; D005306:Fertilization; D013006:Growth Hormone / Q000008:administration & dosage / Q000494:pharmacology*; D007774:Lactation / Q000502:physiology*; D010298:Parity; D011247:Pregnancy; D011994:Recombinant Proteins / Q000008:administration & dosage / Q000494:pharmacology; D012044:Regression Analysis; D013997:Time Factors
chemical_list: D011994:Recombinant Proteins; D013006:Growth Hormone