A Cox proportional-hazards model with time-dependent covariates to evaluate the relationship between body-condition score and the risks of first insemination and pregnancy in a high-producing dairy herd

A Cox proportional-hazards model with time-dependent covariates to evaluate the relationship between body-condition score and the risks of first insemination and pregnancy in a high-producing dairy herd

The objective of this study was to determine the relationship between body-condition score and postpartum reproductive efficiency in dairy cattle. Data on body-condition score, reproduction, diseases, and production from 1404 lactations of 639 cows, calving between January 1984 and November 1996 on...

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Veröffentlicht in:Preventive veterinary medicine 1998-12, Vol.37 (1), p.159-172
Hauptverfasser: Suriyasathaporn, W., Nielen, M., Dieleman, S.J., Brand, A., Noordhuizen-Stassen, E.N., Schukken, Y.H.
Format: Artikel
Sprache:eng
Schlagworte:
Animals
ARTIFICIAL INSEMINATION
BODY CONDITION
Body-condition score
Cattle
Cattle-reproduction
Conception risk
CONDICION CORPORAL
Cox proportional-hazard model
DAIRY COWS
Data Collection
ETAT CORPOREL
Female
First-insemination risk
GESTACION
GESTATION
Health Status
INSEMINACION ARTIFICIAL
Insemination
INSEMINATION ARTIFICIELLE
Lactation
Male
Postpartum Period
PREGNANCY
Pregnancy, Animal
Proportional Hazards Models
RIESGO
RISK
RISQUE
Time Factors
Time-dependent covariates
VACAS LECHERAS
VACHE LAITIERE
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Beschreibung
Zusammenfassung:The objective of this study was to determine the relationship between body-condition score and postpartum reproductive efficiency in dairy cattle. Data on body-condition score, reproduction, diseases, and production from 1404 lactations of 639 cows, calving between January 1984 and November 1996 on a commercial farm, were used. The Cox proportional-hazards model with time-dependent covariates was used to qualify the relationship between body-condition score on a scale of 1 to 5 and risks of first insemination and pregnancy. Cows with body condition at calving
ISSN:0167-5877
1873-1716
DOI:10.1016/S0167-5877(98)00100-7