Cargando…
Genetic analysis for mastitis resistance and milk somatic cell score in French Lacaune dairy sheep
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 e...
Autores principales: | , , , , |
---|---|
Formato: | Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2001
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2705413/ https://www.ncbi.nlm.nih.gov/pubmed/11559483 http://dx.doi.org/10.1186/1297-9686-33-4-397 |
_version_ | 1782168994701115392 |
---|---|
author | Barillet, Francis Rupp, Rachel Mignon-Grasteau, Sandrine Astruc, Jean-Michel Jacquin, Michèle |
author_facet | Barillet, Francis Rupp, Rachel Mignon-Grasteau, Sandrine Astruc, Jean-Michel Jacquin, Michèle |
author_sort | Barillet, Francis |
collection | PubMed |
description | 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. |
format | Text |
id | pubmed-2705413 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2001 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-27054132009-07-03 Genetic analysis for mastitis resistance and milk somatic cell score in French Lacaune dairy sheep Barillet, Francis Rupp, Rachel Mignon-Grasteau, Sandrine Astruc, Jean-Michel Jacquin, Michèle Genet Sel Evol Research 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. BioMed Central 2001-07-15 /pmc/articles/PMC2705413/ /pubmed/11559483 http://dx.doi.org/10.1186/1297-9686-33-4-397 Text en Copyright © 2001 INRA, EDP Sciences |
spellingShingle | Research Barillet, Francis Rupp, Rachel Mignon-Grasteau, Sandrine Astruc, Jean-Michel Jacquin, Michèle Genetic analysis for mastitis resistance and milk somatic cell score in French Lacaune dairy sheep |
title | Genetic analysis for mastitis resistance and milk somatic cell score in French Lacaune dairy sheep |
title_full | Genetic analysis for mastitis resistance and milk somatic cell score in French Lacaune dairy sheep |
title_fullStr | Genetic analysis for mastitis resistance and milk somatic cell score in French Lacaune dairy sheep |
title_full_unstemmed | Genetic analysis for mastitis resistance and milk somatic cell score in French Lacaune dairy sheep |
title_short | Genetic analysis for mastitis resistance and milk somatic cell score in French Lacaune dairy sheep |
title_sort | genetic analysis for mastitis resistance and milk somatic cell score in french lacaune dairy sheep |
topic | Research |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2705413/ https://www.ncbi.nlm.nih.gov/pubmed/11559483 http://dx.doi.org/10.1186/1297-9686-33-4-397 |
work_keys_str_mv | AT barilletfrancis geneticanalysisformastitisresistanceandmilksomaticcellscoreinfrenchlacaunedairysheep AT rupprachel geneticanalysisformastitisresistanceandmilksomaticcellscoreinfrenchlacaunedairysheep AT mignongrasteausandrine geneticanalysisformastitisresistanceandmilksomaticcellscoreinfrenchlacaunedairysheep AT astrucjeanmichel geneticanalysisformastitisresistanceandmilksomaticcellscoreinfrenchlacaunedairysheep AT jacquinmichele geneticanalysisformastitisresistanceandmilksomaticcellscoreinfrenchlacaunedairysheep |