Genetic analysis for mastitis resistance and somatic cell score in French Lacaune dairy sheep

F. Barillet; R. Rupp; S. Mignon-Grasteau; J.M. Astruc; M. Jacquin; G. Lagriffoul

Genetic analysis for mastitis resistance and somatic cell score in French Lacaune dairy sheep

In: Milking and milk production of dairy sheep and goats

Authors:

F. Barillet

F. Barillet INRA, SAGA, 31326 Castanet-Tolosan Cedex, France

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R. Rupp

R. Rupp INRA, SGQA, 78352 Jouy-en-Josas, France

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S. Mignon-Grasteau

S. Mignon-Grasteau INRA, SRA, 37380 Nouzilty, France

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J.M. Astruc

J.M. Astruc IE, 31326 Castanet-Tolosan Cedex, France

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M. Jacquin

M. Jacquin INRA, SAGA, 31326 Castanet-Tolosan Cedex, France

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, and

G. Lagriffoul

G. Lagriffoul CNBL - IE, 31326 Castanet-Tolosan Cedex, France

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Type:: Chapter

Pages:: 393–399

DOI:: https://doi.org/10.1163/9789004683877_082

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Summary

Genetic analysis for mastitis resistance was studied in 957 first lactation Lacaune ewe lambs of an experimental INRA flock composed of 2 divergent lines for milk yield and in 3,811 first lactation (19,200 test day) Lacaune ewe lambs recorded in 38 flocks. The arithmetic average somatic cell count (SCC) was 375,000 cell/ml. The clinical mastitis frequency (5%) was lower than the occurrence of estimated subclinical mastitis (10%) and appeared not to be genetically related to milk yield unlike subclinical mastitis. Thus, at the moment, selection for mastitis resistance may be reduced to selection against subclinical mastitis using somatic cell score (SCS). Heritability estimates for test day SCS (~ 0.02 to 0.15) were clearly lower than those for lactation average SCS (~0.15 to 0.18) and increased with day in milk in connection with the increase in infected ewes. This result suggests that the usual test day model versus lactation model is not sufficient to substantially improve the accuracy of genetic evaluation for SCS, since the main objective is, in fact, to account for subclinical infections.

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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 analysis for mastitis resistance and somatic cell score in French Lacaune dairy sheep

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Milking and milk production of dairy sheep and goats

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