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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Format: | artículo biblioteca |
Language: | English |
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Asociación Interprofesional para el Desarrollo Agrario
2013
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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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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 |
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Dairy sheep Lactations registered to culling Breeding program Dairy sheep Lactations registered to culling Breeding program |
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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 |
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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 |
work_keys_str_mv |
AT jimenezma relationshipbetweenlengthofproductivelifeandthemilkproductioninthespanishassafsheepbreed AT juradojj relationshipbetweenlengthofproductivelifeandthemilkproductioninthespanishassafsheepbreed |
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