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Cited by 34Genetic and phenotypic traits in livestockReproductive Physiology in LivestockStatistical Distribution Estimation and Applications

The DOI matches its Crossref record; 16 of the 16 references it cites were found in a registry or an index.

Development of a Survival Model with Piecewise Weibull Baselines for the Analysis of Length of Productive Life of Holstein Cows in Japan

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Terawaki, Y., Katsumi, T., Ducrocq, V.·2006·Journal of Dairy Science
DOI 10.3168/jds.s0022-0302(06)72449-3
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Abstract

A total of 100,000 records of Holstein dairy cows in Hokkaido, Japan, were used to study the current characteristics of their length of productive life, to build up a suitable model for genetic survival analysis, and to apply the piecewise Weibull baseline model. The data for this analysis only included records of cows belonging to herds in which more than 60% of cows had type score. Compared with other studies, the proportions of cows with only 1 or 2 calvings were low (24 and 46%, respectively), indicating a very low culling rate in first or second parity in Hokkaido. The median length of productive life was about 1,250 d (3 yr and 5 mo). Four different definitions of stages of lactation were studied. The best fit of the data was obtained when stages of lactation were chosen with cutpoints at 0, 60, 250, and 350 d after calving. Whatever the definition of stages of lactation, the piecewise Weibull baseline model was better than a unique baseline model. The estimated shape Weibull parameters rho for the different parity x stage of lactation combinations varied greatly (1.0 to 5.0). The estimated hazard functions based on the piecewise Weibull baseline model were smooth and reflected the important changes in observed hazard within lactation. The results of this study are expected to contribute to the development of a genetic model for sire evaluation and to genetic improvement of length of productive life of Holstein cattle in Hokkaido, Japan.

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Metadata

Authors
Terawaki, Y., Katsumi, T., & Ducrocq, V.
Affiliations
  • Rakuno Gakuen University (JP)
  • Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement (FR)
Corresponding author
Terawaki, Y.
ORCID
Ducrocq, V.
Venue
Journal of Dairy Science
Publisher
American Dairy Science Association
Published
2006-10
Volume
89
Issue
10
Pages
4058-4065
ISSN
0022-0302 (ISSN-L)
DOI
10.3168/jds.s0022-0302(06)72449-3
OpenAlex
W2041101183
Cited by
34
References
16
Citations by year
2026: 1 · 2024: 2 · 2023: 2 · 2022: 2 · 2021: 1 · 2020: 1 · 2019: 1 · 2018: 1 · 2017: 1 · 2016: 6 · 2015: 5 · 2014: 1 · 2013: 4 · 2012: 1
FWCI
0.57
Type
journal article
Language
en
Open access
Licence
Locations
  • Journal of Dairy Science (publishedVersion)
  • PubMed (publishedVersion)
Funders
Institut National de la Recherche Agronomique
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic and phenotypic traits in livestock
  • Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Reproductive Physiology in Livestock
  • Physical Sciences › Mathematics › Statistics and Probability › Statistical Distribution Estimation and Applications
Keywords
length of productive life, Holstein cows, survival analysis, culling rate, parity, hazard function, sire evaluation, genetic improvement, Hokkaido
MeSH terms
Animals, Cattle, Dairying, Female, Japan, Lactation, Longevity, Models, Genetic, Pregnancy, Time Factors, Proportional Hazards Models, Survival Analysis

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