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Relationship between reproduction traits and functional longevity in canadian dairy cattle.
J Dairy Sci. 2008 Apr; 91(4):1660-8.JD

Abstract

The aim of this study was to use survival analysis to assess the relationship between reproduction traits and functional longevity of Canadian dairy cattle. Data consisted of 1,702,857; 67,470; and 33,190 Holstein, Ayrshire, and Jersey cows, respectively. Functional longevity was defined as the number of days from first calving to culling, death, or censoring; adjusted for the effect of milk yield. The reproduction traits included calving traits (calving ease, calf size, and calf survival) and female fertility traits (number of services, days from calving to first service, days from first service to conception, and days open). The statistical model was a Weibull proportional hazards model and included the fixed effects of stage of lactation, season of production, the annual change in herd size, and type of milk recording supervision, age at first calving, effects of milk, fat, and protein yields calculated as within herd-year-parity deviations for each reproduction trait. Herd-year-season of calving and sire were included as random effects. Analysis was performed separately for each reproductive trait. Significant associations between reproduction traits and longevity were observed in all breeds. Increased risk of culling was observed for cows that required hard pull, calved small calves, or dead calves. Moreover, cows that require more services per conception, a longer interval between first service to conception, an interval between calving to first service greater than 90 d, and increased days open were at greater risk of being culled.

Authors+Show Affiliations

Agriculture and Agri-Food Canada, Dairy and Swine Research and Development Centre, Sherbrooke, Quebec, J1M 1Z3 Canada. sewalem@cdn.caNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

18349259

Citation

Sewalem, A, et al. "Relationship Between Reproduction Traits and Functional Longevity in Canadian Dairy Cattle." Journal of Dairy Science, vol. 91, no. 4, 2008, pp. 1660-8.
Sewalem A, Miglior F, Kistemaker GJ, et al. Relationship between reproduction traits and functional longevity in canadian dairy cattle. J Dairy Sci. 2008;91(4):1660-8.
Sewalem, A., Miglior, F., Kistemaker, G. J., Sullivan, P., & Van Doormaal, B. J. (2008). Relationship between reproduction traits and functional longevity in canadian dairy cattle. Journal of Dairy Science, 91(4), 1660-8. https://doi.org/10.3168/jds.2007-0178
Sewalem A, et al. Relationship Between Reproduction Traits and Functional Longevity in Canadian Dairy Cattle. J Dairy Sci. 2008;91(4):1660-8. PubMed PMID: 18349259.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Relationship between reproduction traits and functional longevity in canadian dairy cattle. AU - Sewalem,A, AU - Miglior,F, AU - Kistemaker,G J, AU - Sullivan,P, AU - Van Doormaal,B J, PY - 2008/3/20/pubmed PY - 2008/11/5/medline PY - 2008/3/20/entrez SP - 1660 EP - 8 JF - Journal of dairy science JO - J Dairy Sci VL - 91 IS - 4 N2 - The aim of this study was to use survival analysis to assess the relationship between reproduction traits and functional longevity of Canadian dairy cattle. Data consisted of 1,702,857; 67,470; and 33,190 Holstein, Ayrshire, and Jersey cows, respectively. Functional longevity was defined as the number of days from first calving to culling, death, or censoring; adjusted for the effect of milk yield. The reproduction traits included calving traits (calving ease, calf size, and calf survival) and female fertility traits (number of services, days from calving to first service, days from first service to conception, and days open). The statistical model was a Weibull proportional hazards model and included the fixed effects of stage of lactation, season of production, the annual change in herd size, and type of milk recording supervision, age at first calving, effects of milk, fat, and protein yields calculated as within herd-year-parity deviations for each reproduction trait. Herd-year-season of calving and sire were included as random effects. Analysis was performed separately for each reproductive trait. Significant associations between reproduction traits and longevity were observed in all breeds. Increased risk of culling was observed for cows that required hard pull, calved small calves, or dead calves. Moreover, cows that require more services per conception, a longer interval between first service to conception, an interval between calving to first service greater than 90 d, and increased days open were at greater risk of being culled. SN - 1525-3198 UR - https://neuro.unboundmedicine.com/medline/citation/18349259/Relationship_between_reproduction_traits_and_functional_longevity_in_canadian_dairy_cattle_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0022-0302(08)71294-3 DB - PRIME DP - Unbound Medicine ER -