"EFFECT OF CALVING SEASON ON PRODUCTIVE AND REPRODUCTIVE PERFORMANCE OF A DAIRY HERD IN LOS RIOS REGION"

"EFFECT OF CALVING SEASON ON PRODUCTIVE AND REPRODUCTIVE PERFORMANCE OF A DAIRY HERD IN LOS RIOS REGION"

  Calving season, be it fall or spring, is a particularly important factor which allows the prediction of productive and reproductive performance and provides information regarding influential factors on the dairy business. The objectives of this research were to describe calving distribution of a dairy farm and quantify the effect of calving season on productive and reproductive performance. Multiple linear regression was used to study the following dependant variables: milk yield and composition, and calving interval. The analyzed data corresponded to 1,433 lactations registered from 1989 to 2007 in a dairy farm of southern Chile. Descriptive results showed two clearly distinguishable calving seasons, fall and spring, with calving incidences of 50 and 37%, respectively. Milk yield and composition were significantly affected by calving season, however, calving interval was not statistically associated with calving season. Regarding milk yield, lactations initiated during the fall were significantly more productive than those started in spring. Also, fall calving was significantly more productive in terms of milk fat which can be explained as a consequence of feeding changes across seasons. Protein yield was significantly higher for spring calving which is associated to spring grass nutrient composition.  

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Main Authors: Núñez M., Claudia, Mujica, Fernando, Uribe, Héctor
Format: Digital revista
Language:spa
Published: Facultad de Ciencias Agrarias. Universidad Austral de Chile 2011
Online Access:http://revistas.uach.cl/index.php/agrosur/article/view/4068
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spelling rev-agrosur-cl-article-40682019-10-01T12:58:38Z "EFFECT OF CALVING SEASON ON PRODUCTIVE AND REPRODUCTIVE PERFORMANCE OF A DAIRY HERD IN LOS RIOS REGION" EFECTO DE LA EPOCA DE PARTO SOBRE RENDIMIENTOS PRODUCTIVOS Y REPRODUCTIVOS DE UN REBAÑO LECHERO DE LA REGION DE LOS RIOS Núñez M., Claudia Mujica, Fernando Uribe, Héctor Lechería época de parto leche proteína grasa lapso interparto Dairy calving season milk yield protein fat calving interval   Calving season, be it fall or spring, is a particularly important factor which allows the prediction of productive and reproductive performance and provides information regarding influential factors on the dairy business. The objectives of this research were to describe calving distribution of a dairy farm and quantify the effect of calving season on productive and reproductive performance. Multiple linear regression was used to study the following dependant variables: milk yield and composition, and calving interval. The analyzed data corresponded to 1,433 lactations registered from 1989 to 2007 in a dairy farm of southern Chile. Descriptive results showed two clearly distinguishable calving seasons, fall and spring, with calving incidences of 50 and 37%, respectively. Milk yield and composition were significantly affected by calving season, however, calving interval was not statistically associated with calving season. Regarding milk yield, lactations initiated during the fall were significantly more productive than those started in spring. Also, fall calving was significantly more productive in terms of milk fat which can be explained as a consequence of feeding changes across seasons. Protein yield was significantly higher for spring calving which is associated to spring grass nutrient composition.     La época de parto con la que se inicia la lactancia, ya sea otoño o primavera, tiene especial importancia para reconocer cuáles serán los rendimientos esperables tanto desde el punto de vista productivo como reproductivo, y cuáles son las causas o las variables que influyen en éstos, para poder manejar de mejor forma una explotación lechera. Es por esto que en el presente estudio tuvo como objetivos, describir la distribución de partos de una lechería y cuantificar el efecto de la época de parto sobre el comportamiento productivo y reproductivo, de las lactancias en estudio. Esto se realizó, mediante modelos de regresión lineal múltiple para las variables dependientes analizadas: producción y composición de leche y la variable reproductiva Lapso Interparto (LIP). Los datos analizados corresponden a los de una lechería del sur del país y se analizaron 1.433 lactancias desde los años 1989 a 2007. Los resultados descriptivos presentaron dos épocas claras de parto, otoño y primavera con ocurrencia de partos de un 50% y de un 37%, respectivamente. Los modelos propuestos determinaron que la época de parto tuvo efectos significativos sobre los rendimientos productivos analizados, vale decir, producción y composición de leche. Sin embargo, no influyó significativamente en el LIP. En producción de leche las lactancias iniciadas en otoño fueron significativamente más productivas que las iniciadas en primavera. En los rendimientos de grasa, la época de otoño fue significativamente más favorable, acorde con los cambios en los patrones alimenticios que se expresan en las distintas épocas. Para los niveles de proteína láctea se obtuvieron significativamente mayores rendimientos en primavera, lo que está relacionado a la mayor calidad que presenta la pradera en esta estación del año.   Facultad de Ciencias Agrarias. Universidad Austral de Chile 2011-12-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://revistas.uach.cl/index.php/agrosur/article/view/4068 10.4206/agrosur.2011.v39n3-03 Agro sur; Vol. 39 Núm. 3 (2011); 133-142 0719-4196 0304-8802 spa http://revistas.uach.cl/index.php/agrosur/article/view/4068/5082 http://revistas.uach.cl/index.php/agrosur/article/view/4068/5083 Derechos de autor 2011 Agro sur
institution UACH CL
collection OJS
country Chile
countrycode CL
component Revista
access En linea
databasecode rev-agrosur-cl
tag revista
region America del Sur
libraryname Biblioteca de la Facultad de Ciencias Agrarias y Alimentarias de la UACH
language spa
format Digital
author Núñez M., Claudia
Mujica, Fernando
Uribe, Héctor
spellingShingle Núñez M., Claudia
Mujica, Fernando
Uribe, Héctor
"EFFECT OF CALVING SEASON ON PRODUCTIVE AND REPRODUCTIVE PERFORMANCE OF A DAIRY HERD IN LOS RIOS REGION"
author_facet Núñez M., Claudia
Mujica, Fernando
Uribe, Héctor
author_sort Núñez M., Claudia
title "EFFECT OF CALVING SEASON ON PRODUCTIVE AND REPRODUCTIVE PERFORMANCE OF A DAIRY HERD IN LOS RIOS REGION"
title_short "EFFECT OF CALVING SEASON ON PRODUCTIVE AND REPRODUCTIVE PERFORMANCE OF A DAIRY HERD IN LOS RIOS REGION"
title_full "EFFECT OF CALVING SEASON ON PRODUCTIVE AND REPRODUCTIVE PERFORMANCE OF A DAIRY HERD IN LOS RIOS REGION"
title_fullStr "EFFECT OF CALVING SEASON ON PRODUCTIVE AND REPRODUCTIVE PERFORMANCE OF A DAIRY HERD IN LOS RIOS REGION"
title_full_unstemmed "EFFECT OF CALVING SEASON ON PRODUCTIVE AND REPRODUCTIVE PERFORMANCE OF A DAIRY HERD IN LOS RIOS REGION"
title_sort "effect of calving season on productive and reproductive performance of a dairy herd in los rios region"
description   Calving season, be it fall or spring, is a particularly important factor which allows the prediction of productive and reproductive performance and provides information regarding influential factors on the dairy business. The objectives of this research were to describe calving distribution of a dairy farm and quantify the effect of calving season on productive and reproductive performance. Multiple linear regression was used to study the following dependant variables: milk yield and composition, and calving interval. The analyzed data corresponded to 1,433 lactations registered from 1989 to 2007 in a dairy farm of southern Chile. Descriptive results showed two clearly distinguishable calving seasons, fall and spring, with calving incidences of 50 and 37%, respectively. Milk yield and composition were significantly affected by calving season, however, calving interval was not statistically associated with calving season. Regarding milk yield, lactations initiated during the fall were significantly more productive than those started in spring. Also, fall calving was significantly more productive in terms of milk fat which can be explained as a consequence of feeding changes across seasons. Protein yield was significantly higher for spring calving which is associated to spring grass nutrient composition.  
publisher Facultad de Ciencias Agrarias. Universidad Austral de Chile
publishDate 2011
url http://revistas.uach.cl/index.php/agrosur/article/view/4068
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