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

Autor: J. M. Astruc, Sandrine Mignon-Grasteau, Rachel Rupp, M. Jacquin, Francis Barillet
Přispěvatelé: Station d'Amélioration Génétique des Animaux (SAGA), Institut National de la Recherche Agronomique (INRA), Station de Génétique Quantitative et Appliquée (SGQA)
Jazyk: angličtina
Rok vydání: 2001
Předmět:
héritabilité
Staphylococcus
Culling
Mastitis
Breeding
dairy sheep
ovin
Risk Factors
Lactation
méthode statistique
genetic parameters
Genetics(clinical)
numération cellulaire
lcsh:SF1-1100
0303 health sciences
somatic cell count
04 agricultural and veterinary sciences
General Medicine
Dairying
medicine.anatomical_structure
Milk
risque
Female
France
résistance aux maladies
lcsh:QH426-470
MAMMITE
Biology
paramètre génétique
Genetic correlation
03 medical and health sciences
Animal science
Mammary Glands
Animal
Genetic variation
Genetics
medicine
Animals
Ecology
Evolution
Behavior and Systematics
030304 developmental biology
[SDV.GEN]Life Sciences [q-bio]/Genetics
chèvre laitière
Sheep
méthode d'amélioration génétique
Research
0402 animal and dairy science
Genetic Variation
Heritability
medicine.disease
040201 dairy & animal science
lait
[SDV.GEN.GA]Life Sciences [q-bio]/Genetics/Animal genetics
lcsh:Genetics
cellule somatique
Animal Science and Zoology
Flock
lcsh:Animal culture
maladie des glandes mammaires
Somatic cell count
Mathematics
Zdroj: Genetics Selection Evolution
Genetics Selection Evolution, BioMed Central, 2001, 33, pp.397-415
Genetics, Selection, Evolution : GSE
Genetics Selection Evolution (33), 397-415. (2001)
Genetics Selection Evolution, Vol 33, Iss 4, Pp 397-415 (2001)
Genetics Selection Evolution, BioMed Central, 2001, 33 (4), pp.397-415. ⟨10.1051/gse:2001124⟩
ISSN: 0999-193X
1297-9686
DOI: 10.1051/gse:2001124⟩
Popis: Genetic analysis for mastitis resistance was studied from two data sets. Firstly, risk factors for different mastitis traits, i.e. culling due to clinical or chronic mastitis and subclinical mastitis predicted from somatic cell count (SCC), were explored using data from 957 first lactation Lacaune ewes of an experimental INRA flock composed of two divergent lines for milk yield. Secondly, genetic parameters for SCC were estimated from 5 272 first lactation Lacaune ewes recorded among 38 flocks, using an animal model. In the experimental flock, the frequency of culling due to clinical mastitis (5%) was lower than that of subclinical mastitis (10%) predicted from SCC. Predicted subclinical mastitis was unfavourably associated with the milk yield level. Such an antagonism was not detected for clinical mastitis, which could result, to some extent, from its low frequency or from the limited amount of data. In practice, however, selection for mastitis resistance could be limited in a first approach to selection against subclinical mastitis using SCC. The heritability estimate of SCC was 0.15 for the lactation mean trait and varied from 0.04 to 0.12 from the first to the fifth test-day. The genetic correlation between lactation SCC and milk yield was slightly positive (0.15) but showed a strong evolution during lactation, i.e. from favourable (-0.48) to antagonistic (0.27). On a lactation basis, our results suggest that selection for mastitis resistance based on SCC is feasible. Patterns for genetic parameters within first lactation, however, require further confirmation and investigation.
Databáze: OpenAIRE
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