Bases for evaluating the reproductive performance of breeding herds managed under grazing conditions
Some factors influencing the reproductive performance of beef breeding herds managed under grazing conditions are discussed in this paper. In addition, the objectives for commercial beef herds are set and an index of reproductive performance efficiency (IER) es presented. The use of IER for comparison between different herds is considered. Total kg of calves weaned per hectare is not only dependant upon those basic resources of the farm but also on management decisions which set the stocking rate and the reproductive practices carried out in the farm. Both these factors have an overriding importance in defining the reproductive efficiency of beef breeding herds. The ultimate objetive for beef breeding herds must be minimun weight and condition of the herd through least cost feeding systems consistent with heavy calves at weaning, satisfactory cow and calf survival and unimpaired fertility. Because of pregnancy rates alone do not account for many of those factors influencing reproductive efficiency of beef herds, IER can help to compare different herds managed under different environment as well as to determine the scope improvement in that efficiency.
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Sociedad de Medicina Veterinaria del Uruguay (SMVU)
1995
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rev-smvu-uy-article-6452021-01-20T14:53:17Z Bases for evaluating the reproductive performance of breeding herds managed under grazing conditions Bases para la evaluación de la performance reproductiva de los rodeos de cría manejados en condiciones de pastoreo de Nava Silva, G. T. Rodríguez Sabarrós, M. Eficiencia reproductiva Rodeos bovinos Reproductive efficiency Beef heards Some factors influencing the reproductive performance of beef breeding herds managed under grazing conditions are discussed in this paper. In addition, the objectives for commercial beef herds are set and an index of reproductive performance efficiency (IER) es presented. The use of IER for comparison between different herds is considered. Total kg of calves weaned per hectare is not only dependant upon those basic resources of the farm but also on management decisions which set the stocking rate and the reproductive practices carried out in the farm. Both these factors have an overriding importance in defining the reproductive efficiency of beef breeding herds. The ultimate objetive for beef breeding herds must be minimun weight and condition of the herd through least cost feeding systems consistent with heavy calves at weaning, satisfactory cow and calf survival and unimpaired fertility. Because of pregnancy rates alone do not account for many of those factors influencing reproductive efficiency of beef herds, IER can help to compare different herds managed under different environment as well as to determine the scope improvement in that efficiency. En este artículo se discuten algunos de los factores que influencian la performance reproductiva de los rodeos de cría en condiciones de pastoreo. Además, los objetivos que deben ser tomados en cuenta y un índice de la eficiencia de la performance reproductiva (IER) son presentados y discutidos. Los kilos de terneros que se desletan por hectárea no solo dependen de los recursos básicos del predio, sino también de las decisiones de manejo que establecen la carga animal y las prácticas reproductivas que serán llevadas a cabo en el establecimiento. Ambos factores tienen una gran importancia en la definición de la eficiencia reproductiva de los rodeos. El principal objetivo de los rodeos de cría debe ser el mínimo peso y condición, a través de sistemas de alimentación de mínima costo, pero que no impida la obtención de terneros pesados al destete, adecuadas tasas de sobrevivencia de vacas y terneros y satisfactoria fertilidad. Debido a que los porcentajes de preñez no parecen reflejar exactamente la eficiencia de la performance reproductiva, el IER puede ayudar a comparar rodeos manejados en diferentes ambientes así como establecer el potencial para mejorar esa eficiencia. Sociedad de Medicina Veterinaria del Uruguay (SMVU) 1995-09-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed article. Artículo evaluado por pares. Artigo revisado por pares. application/pdf https://www.revistasmvu.com.uy/index.php/smvu/article/view/645 Veterinaria (Montevideo); Vol. 31 No. 127 (1995): September; 19-24 Veterinaria (Montevideo); Vol. 31 Núm. 127 (1995): Setiembre; 19-24 Veterinaria (Montevideo); v. 31 n. 127 (1995): Setembro; 19-24 1688-4809 0376-4362 spa https://www.revistasmvu.com.uy/index.php/smvu/article/view/645/414 Derechos de autor 1995 Sociedad de Medicina Veterinaria del Uruguay |
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Biblioteca de la Facultad de Veterinaria de la UDELAR de UY |
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| author |
de Nava Silva, G. T. Rodríguez Sabarrós, M. |
| spellingShingle |
de Nava Silva, G. T. Rodríguez Sabarrós, M. Bases for evaluating the reproductive performance of breeding herds managed under grazing conditions |
| author_facet |
de Nava Silva, G. T. Rodríguez Sabarrós, M. |
| author_sort |
de Nava Silva, G. T. |
| title |
Bases for evaluating the reproductive performance of breeding herds managed under grazing conditions |
| title_short |
Bases for evaluating the reproductive performance of breeding herds managed under grazing conditions |
| title_full |
Bases for evaluating the reproductive performance of breeding herds managed under grazing conditions |
| title_fullStr |
Bases for evaluating the reproductive performance of breeding herds managed under grazing conditions |
| title_full_unstemmed |
Bases for evaluating the reproductive performance of breeding herds managed under grazing conditions |
| title_sort |
bases for evaluating the reproductive performance of breeding herds managed under grazing conditions |
| description |
Some factors influencing the reproductive performance of beef breeding herds managed under grazing conditions are discussed in this paper. In addition, the objectives for commercial beef herds are set and an index of reproductive performance efficiency (IER) es presented. The use of IER for comparison between different herds is considered. Total kg of calves weaned per hectare is not only dependant upon those basic resources of the farm but also on management decisions which set the stocking rate and the reproductive practices carried out in the farm. Both these factors have an overriding importance in defining the reproductive efficiency of beef breeding herds. The ultimate objetive for beef breeding herds must be minimun weight and condition of the herd through least cost feeding systems consistent with heavy calves at weaning, satisfactory cow and calf survival and unimpaired fertility. Because of pregnancy rates alone do not account for many of those factors influencing reproductive efficiency of beef herds, IER can help to compare different herds managed under different environment as well as to determine the scope improvement in that efficiency. |
| publisher |
Sociedad de Medicina Veterinaria del Uruguay (SMVU) |
| publishDate |
1995 |
| url |
https://www.revistasmvu.com.uy/index.php/smvu/article/view/645 |
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