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Estimation of (co)variance components of nematode parasites resistance and somatic cell count in dairy sheep

Sechi, Stefania and Salaris, Sotero and Scala, Antonio and Rupp, Rachel and Moreno, Carole and Bishop, Stephen C. and Casu, Sara (2009) Estimation of (co)variance components of nematode parasites resistance and somatic cell count in dairy sheep. Italian Journal of Animal Science, Vol. 8 (Suppl. 2), p. 156-158. ISSN 1828-051X. Article.

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Abstract

Nematode parasites and mastitis are the major animal health constraints in sheep. The aim of this study was estimating the genetic (co)variances of nematode parasites resistance and somatic cell count in dairy sheep. From 2000 to 2008, Somatic Cell Score (SCS) and Faecal Egg Count (FEC) records were available on an experimental population consisting of 949 backcross ewes and 806 their daughters. Data were processed independently for each subpopulation in order to adjust for specific environmental effects and to obtain lactation records for both traits to be used in the genetic analysis. Variance components estimation was performed by using the REML method applied to a bi-trait repeatability animal model. Heritabilities of lactation SCS (LSCS) and FEC were 0.19 and 0.16. Genetic correlation was 0.21, whereas phenotypic correlation was 0.01. The estimated heritabilities confirm that both traits could be selected by the classical quantitative approach. The genetic correlation estimate between LSCS and FEC suggests that selection for one of the two traits would not have any detrimental effect on the other one.

Item Type:Article
ID Code:3018
Status:Published
Refereed:Yes
Uncontrolled Keywords:Genetic parameters, SCS, nematode parasite resistance
Subjects:Area 07 - Scienze agrarie e veterinarie > VET/06 Parassitologia e malattie parassitarie degli animali
Divisions:001 Università di Sassari > 01 Dipartimenti > Biologia animale
002 Altri enti e centri di ricerca del Nord Sardegna > AGRIS Sardegna, Olmedo > Dipartimento per la ricerca nelle produzioni animali
Publisher:Avenue media on behalf of Scientific Association of Animal Production (ASPA)
ISSN:1828-051X
Publisher Policy:Depositato per gentile concessione dell'ASPA
Additional Information:Relazione presentata al 18. Congresso nazionale ASPA, Palermo, 9-12 giugno 2009.
Deposited On:18 Sep 2009 12:18

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