Impact of management factors on days to conception in dairy heifers
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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Formato: | Artículo revista |
Lenguaje: | Español |
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Facultad de Ciencias Agropecuarias. Área de Difusión Científica
2020
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Acceso en línea: | https://revistas.unc.edu.ar/index.php/agris/article/view/25979 |
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I10-R10article-25979 |
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ojs |
institution |
Universidad Nacional de Córdoba |
institution_str |
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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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