Genetic and environmental correlations among somatic cell counts, milk yield and protein percentage in milking ewes

U.M. El-Saied; J.A. Carriedo; L.F. de la Fuente; F. San Primitivo

Genetic and environmental correlations among somatic cell counts, milk yield and protein percentage in milking ewes

In: Milking and milk production of dairy sheep and goats

Authors:

U.M. El-Saied

U.M. El-Saied Agricultural Experiment Station, Faculty of Agriculture, Cairo University, Giza, Egypt
Departamento de Produccián Animal I, Universidad de Leán, 24071, Leán, Spain

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J.A. Carriedo

J.A. Carriedo Departamento de Produccián Animal I, Universidad de Leán, 24071, Leán, Spain

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L.F. de la Fuente

L.F. de la Fuente Departamento de Produccián Animal I, Universidad de Leán, 24071, Leán, Spain

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, and

F. San Primitivo

F. San Primitivo Departamento de Produccián Animal I, Universidad de Leán, 24071, Leán, Spain

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Type:: Chapter

Pages:: 400–405

DOI:: https://doi.org/10.1163/9789004683877_083

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Summary

A total of 10,624 monthly test day records of SCC, milk yield, and protein percentage for 3,489 Spanish Churra ewes from 10 flocks were used to estimate genetic and environmental correlations. Genetic correlations were estimated by REML procedure with a multitrait repeatability animal model.

Genetic correlations of log SCC with milk yield and protein percentage were -0.10 and 0.03, respectively. Genetic correlation between milk yield and protein percentage was -0.27. Permanent environmental correlations of log SCC with milk yield and protein percentage were -0.26 and 0.23, respectively. Phenotypic correlations were -0.15 and 0.10.

The low genetic correlation of log SCC with milk yield and the nil genetic correlation between cell counts and protein percentage may indicate that selection decisions for improving milk yield and protein percentage for Churra ewes are not expected to have an effective correlated response in cell counts.

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Milking and milk production of dairy sheep and goats

E-Book ISBN:: 9789004683877

Publisher:: Wageningen Academic

Print Publication Date:: 01 Jan 1999

Subjects
- Life Sciences
  - General
  - Animal & Veterinary

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Genetic and environmental correlations among somatic cell counts, milk yield and protein percentage in milking ewes

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Milking and milk production of dairy sheep and goats

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