Relationship between length of productive life and the milk production in the Spanish Assaf sheep breed

The Spanish Assaf sheep breed has a National Breeding Program based on increasing milk production per lactation and its quality. This research attempts to determine the relationship between milk yield and length of productive life (number of lactations registered to culling) of the breed, using historic data from official dairy recording system until 2011. For each individual (27.170 dead and 36.268 alive animals) the average value of 150d standardized milk yield was calculated. Analysis of variance (GLM procedure of SAS) of milk production was performed using different models based on the state of sheep (alive or dead), flock, average type of birth, average number of dry days, and productive life. The average value of productive life was 3.76 lactactions/sheep (55.3% of the animals had between 2 and 3 lactations recorded to low). The results showed an increase in milk production over the years and a reduction of productive life.

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Bibliographic Details
Main Authors: Jiménez, M. A., Jurado, J. J.
Format: artículo biblioteca
Language:English
Published: Asociación Interprofesional para el Desarrollo Agrario 2013
Subjects:Dairy sheep, Lactations registered to culling, Breeding program,
Online Access:http://hdl.handle.net/20.500.12792/2195
http://hdl.handle.net/10261/292602
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spelling dig-inia-es-10261-2926022023-02-20T07:30:34Z Relationship between length of productive life and the milk production in the Spanish Assaf sheep breed Jiménez, M. A. Jurado, J. J. Dairy sheep Lactations registered to culling Breeding program The Spanish Assaf sheep breed has a National Breeding Program based on increasing milk production per lactation and its quality. This research attempts to determine the relationship between milk yield and length of productive life (number of lactations registered to culling) of the breed, using historic data from official dairy recording system until 2011. For each individual (27.170 dead and 36.268 alive animals) the average value of 150d standardized milk yield was calculated. Analysis of variance (GLM procedure of SAS) of milk production was performed using different models based on the state of sheep (alive or dead), flock, average type of birth, average number of dry days, and productive life. The average value of productive life was 3.76 lactactions/sheep (55.3% of the animals had between 2 and 3 lactations recorded to low). The results showed an increase in milk production over the years and a reduction of productive life. 2023-02-20T07:30:34Z 2023-02-20T07:30:34Z 2013 artículo Información Técnica Económica Agraria 109(3): 319-330 (2013) 1699‑6887 http://hdl.handle.net/20.500.12792/2195 http://hdl.handle.net/10261/292602 10.12706/itea.2013.019 2386‑3765 en none Asociación Interprofesional para el Desarrollo Agrario
institution INIA ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-inia-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del INIA España
language English
topic Dairy sheep
Lactations registered to culling
Breeding program
Dairy sheep
Lactations registered to culling
Breeding program
spellingShingle Dairy sheep
Lactations registered to culling
Breeding program
Dairy sheep
Lactations registered to culling
Breeding program
Jiménez, M. A.
Jurado, J. J.
Relationship between length of productive life and the milk production in the Spanish Assaf sheep breed
description The Spanish Assaf sheep breed has a National Breeding Program based on increasing milk production per lactation and its quality. This research attempts to determine the relationship between milk yield and length of productive life (number of lactations registered to culling) of the breed, using historic data from official dairy recording system until 2011. For each individual (27.170 dead and 36.268 alive animals) the average value of 150d standardized milk yield was calculated. Analysis of variance (GLM procedure of SAS) of milk production was performed using different models based on the state of sheep (alive or dead), flock, average type of birth, average number of dry days, and productive life. The average value of productive life was 3.76 lactactions/sheep (55.3% of the animals had between 2 and 3 lactations recorded to low). The results showed an increase in milk production over the years and a reduction of productive life.
format artículo
topic_facet Dairy sheep
Lactations registered to culling
Breeding program
author Jiménez, M. A.
Jurado, J. J.
author_facet Jiménez, M. A.
Jurado, J. J.
author_sort Jiménez, M. A.
title Relationship between length of productive life and the milk production in the Spanish Assaf sheep breed
title_short Relationship between length of productive life and the milk production in the Spanish Assaf sheep breed
title_full Relationship between length of productive life and the milk production in the Spanish Assaf sheep breed
title_fullStr Relationship between length of productive life and the milk production in the Spanish Assaf sheep breed
title_full_unstemmed Relationship between length of productive life and the milk production in the Spanish Assaf sheep breed
title_sort relationship between length of productive life and the milk production in the spanish assaf sheep breed
publisher Asociación Interprofesional para el Desarrollo Agrario
publishDate 2013
url http://hdl.handle.net/20.500.12792/2195
http://hdl.handle.net/10261/292602
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