Survival analysis of productive life in Florida dairy goats using a Cox proportional hazards model

Longevity is an economically important trait, since extending the functional life of a doe would allow us to keep the most productive females in the herd as long as possible, and this could result in the increased profitability of dairy farms. Thus, the objectives of this study were to determine the...

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Bibliographic Details
Published in:Journal of animal breeding and genetics (1986) 2023-07, Vol.140 (4), p.431-439
Main Authors: Ziadi, C, Sánchez, J P, Sánchez, M, Morales, R, Molina, A
Format: Article
Language:English
Subjects:
Age
Animals
Cox model
Dairy farming
Dairy farms
dairy goat
Dairying
Economics
Female
Females
Florida
Genetic diversity
genetic parameters
Genetic variance
Goats
Goats - genetics
Hazards
Heritability
Lactation
Lactation - genetics
Longevity
Milk
Milk production
productive life
Profitability
Proportional Hazards Models
Statistical models
Survival Analysis
Time dependence
Variance
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Summary:Longevity is an economically important trait, since extending the functional life of a doe would allow us to keep the most productive females in the herd as long as possible, and this could result in the increased profitability of dairy farms. Thus, the objectives of this study were to determine the most important factors that influence the length of productive life (LPL) of female Florida goats and to estimate its genetic additive variance using a Cox proportional hazards model. The data consisted of 70,695 productive life records from 25,722 Florida females kidding between 2006 and 2020. A total of 19,495 does had completed their productive life while 6227 (24.2%) does had censored information. The pedigree contained information on 56,901 animals. The average censoring age and average failure age after first kidding for LPL were 36 and 47 months respectively. The model included, as time‐independent effects, the age at first kidding and the interaction between herd, year and season of birth of the doe, and as time‐dependent effects, the age at kidding, the interaction between herd, year and season of kidding, the within‐herd class of milk production deviation, and the interaction between the lactation number and the stage of lactation. All fixed effects had a significant effect on LPL (p 
ISSN:0931-2668
1439-0388
DOI:10.1111/jbg.12769