Impact of management factors on days to conception in dairy heifers

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Increasing the number of pregnant heifers per time unit improves reproductive efficiency in dairy herds. The objective of this work was to analyze the effect of management factors on conception. Reproductive events of 2532 heifers throughout 37 years were analyzed adjusting proportional risk models....

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Autores principales: Vera, Milba Marina, Piccardi, Monica, Maciel, Martin, Franco, Liliana, Mezzadra, Carlos, Balzarini, Monica
Formato: Artículo revista
Lenguaje:Español
Publicado: Facultad de Ciencias Agropecuarias. Área de Difusión Científica 2020
Materias:
Survival analysis
reproductive efficiency
conception rates
eficiencia reproductiva
modelo de riesgos proporcionales
tasa de concepción
Acceso en línea:https://revistas.unc.edu.ar/index.php/agris/article/view/25979
Aporte de:
Revistas de la UNC de Universidad Nacional de Córdoba
id I10-R10article-25979
record_format ojs
institution Universidad Nacional de Córdoba
institution_str I-10
repository_str R-10
container_title_str Revistas de la UNC
language Español
format Artículo revista
topic Survival analysis
reproductive efficiency
conception rates
eficiencia reproductiva
modelo de riesgos proporcionales
tasa de concepción
spellingShingle Survival analysis
reproductive efficiency
conception rates
eficiencia reproductiva
modelo de riesgos proporcionales
tasa de concepción
Vera, Milba Marina
Piccardi, Monica
Maciel, Martin
Franco, Liliana
Mezzadra, Carlos
Balzarini, Monica
Impact of management factors on days to conception in dairy heifers
topic_facet Survival analysis
reproductive efficiency
conception rates
eficiencia reproductiva
modelo de riesgos proporcionales
tasa de concepción
author Vera, Milba Marina
Piccardi, Monica
Maciel, Martin
Franco, Liliana
Mezzadra, Carlos
Balzarini, Monica
author_facet Vera, Milba Marina
Piccardi, Monica
Maciel, Martin
Franco, Liliana
Mezzadra, Carlos
Balzarini, Monica
author_sort Vera, Milba Marina
title Impact of management factors on days to conception in dairy heifers
title_short Impact of management factors on days to conception in dairy heifers
title_full Impact of management factors on days to conception in dairy heifers
title_fullStr Impact of management factors on days to conception in dairy heifers
title_full_unstemmed Impact of management factors on days to conception in dairy heifers
title_sort impact of management factors on days to conception in dairy heifers
description Increasing the number of pregnant heifers per time unit improves reproductive efficiency in dairy herds. The objective of this work was to analyze the effect of management factors on conception. Reproductive events of 2532 heifers throughout 37 years were analyzed adjusting proportional risk models. Days to conception (DC) were measured as the interval in days from the start of the service period (IPS) to conception. The observation period per animal was 90 days. Models adjusted for DC include effects of age at IPS, year, number and season of services, conception rate of bulls, and year-to-season interaction with services. The Weibull model adjusts the DC variation pattern. Conception was lower in heifers under 18 months, in the 2nd and 3rd service, and when bulls with less conception rate were used. Conception was higher in fall services by 1.17 times compared to spring services. Identifying management factors affecting days to conception in heifers allows developing strategies to improve reproductive efficiency in dairy herds.
publisher Facultad de Ciencias Agropecuarias. Área de Difusión Científica
publishDate 2020
url https://revistas.unc.edu.ar/index.php/agris/article/view/25979
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