Effect of milk production on reproductive performance in dairy herds

The objective of the present study was to assess the relationship between individual cow milk yield and fertility, accounting for the contextual effect of the herd. A data set including 657,968 lactations from 677 dairy herds in Argentina from 2001 to 2012 was used. The odds of pregnancy by 100 d in...

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Autores principales: Rearte, Ramiro, LeBlanc, Stephen J., Corva, Santiago Gerardo, Sota, Rodolfo Luzbel de la, Lacau Mengido, I. M., Giuliodori, Mauricio Javier
Formato: Articulo
Lenguaje:Inglés
Publicado: 2018
Materias:
Veterinaria
milk yield
reproductive performance
contextual effect
multilevel model
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/132606
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-132606
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Veterinaria
milk yield
reproductive performance
contextual effect
multilevel model
spellingShingle Veterinaria
milk yield
reproductive performance
contextual effect
multilevel model
Rearte, Ramiro
LeBlanc, Stephen J.
Corva, Santiago Gerardo
Sota, Rodolfo Luzbel de la
Lacau Mengido, I. M.
Giuliodori, Mauricio Javier
Effect of milk production on reproductive performance in dairy herds
topic_facet Veterinaria
milk yield
reproductive performance
contextual effect
multilevel model
description The objective of the present study was to assess the relationship between individual cow milk yield and fertility, accounting for the contextual effect of the herd. A data set including 657,968 lactations from 677 dairy herds in Argentina from 2001 to 2012 was used. The odds of pregnancy by 100 d in milk (DIM) were assessed by a multilevel logistic model (with cow as the first and herd as the second hierarchical level), and time to pregnancy was assessed by a proportional hazards regression model. Multilevel logistic models included the fixed effects of milk yield by 80 DIM, parity, year, and calving season at cow level and quartiles of herd milk yield by 80 DIM as a contextual effect. The proportional hazards model included the effect of daily cow-level milk yield as time-dependent variable, with milk yield at herd level as the stratification variable. Cows producing 1 standard deviation over the mean milk yield of their herd had 1.3 percentage point lower pregnancy by 100 DIM (from 31.4 to 30.1%; odds ratio = 0.942) when in herds in the top quartile of milk yield, whereas they increased 0.5 percentage points (from 27.9 to 28.4%) when in herds in the lowest quartile of milk yield. Only 4% of the observed variation in pregnancy by 100 DIM was explained by the random effect of the herd. Similarly, cows producing 1 standard deviation (8 kg/d) greater than the herd mean daily milk had 1.3% lower hazard of pregnancy (hazard ratio = 0.987) at 63 DIM in herds in the top quartile of milk yield, whereas they had 14.8% higher hazard (hazard ratio = 1.148) in herds in the lowest quartile of milk yield. The magnitude of the negative association between the cow's daily milk yield and the hazard of pregnancy increased with DIM. In conclusion, the relationship between milk yield and reproductive performance is statistically significant, but the effect size is practically small and is modulated by herd production level.
format Articulo
Articulo
author Rearte, Ramiro
LeBlanc, Stephen J.
Corva, Santiago Gerardo
Sota, Rodolfo Luzbel de la
Lacau Mengido, I. M.
Giuliodori, Mauricio Javier
author_facet Rearte, Ramiro
LeBlanc, Stephen J.
Corva, Santiago Gerardo
Sota, Rodolfo Luzbel de la
Lacau Mengido, I. M.
Giuliodori, Mauricio Javier
author_sort Rearte, Ramiro
title Effect of milk production on reproductive performance in dairy herds
title_short Effect of milk production on reproductive performance in dairy herds
title_full Effect of milk production on reproductive performance in dairy herds
title_fullStr Effect of milk production on reproductive performance in dairy herds
title_full_unstemmed Effect of milk production on reproductive performance in dairy herds
title_sort effect of milk production on reproductive performance in dairy herds
publishDate 2018
url http://sedici.unlp.edu.ar/handle/10915/132606
work_keys_str_mv AT rearteramiro effectofmilkproductiononreproductiveperformanceindairyherds
AT leblancstephenj effectofmilkproductiononreproductiveperformanceindairyherds
AT corvasantiagogerardo effectofmilkproductiononreproductiveperformanceindairyherds
AT sotarodolfoluzbeldela effectofmilkproductiononreproductiveperformanceindairyherds
AT lacaumengidoim effectofmilkproductiononreproductiveperformanceindairyherds
AT giuliodorimauriciojavier effectofmilkproductiononreproductiveperformanceindairyherds
bdutipo_str Repositorios
_version_ 1764820454160203777

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