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Evaluation of connectedness in the registered population of the Sardinian dairy sheep breed

Salaris, Sotero Luca and Fresi, Pancrazio and Casu, Sara (2009) Evaluation of connectedness in the registered population of the Sardinian dairy sheep breed. Italian Journal of Animal Science, Vol. 8 (Suppl. 2), p. 141-143. eISSN 1828-051X. Article.

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DOI: 10.4081/ijas.2009.s2.141


Connectedness across flocks of the registered population of the Sardinian dairy sheep breed was evaluated. Used criteria were: number of sires used in the same contemporary group; number of direct links and the average within and between contemporary group relationship coefficients. Dataset including yearlings’ first lactation records of 1990 and 2008 were compared to evaluate the effect of coupling artificial insemination with controlled natural mating on connectedness. An increase of number of sires and direct links were registered between 1990 and 2008. These results confirm that the across years prolonged use of well planned moderate rates of artificial insemination had a strong effect on the overall statistical connectedness across flocks so permitting more accurate estimations of the management and genetic effects. As a whole, the decreasing of the average relationship within flock coupled to a marked enhance of the average relationship between contemporary groups, indicates that the genetic connectedness of the Sardinian registered population presents a clearly increasing trend. This fact assures that current genetic evaluations are reliable across flocks.

Item Type:Article
ID Code:5738
Uncontrolled Keywords:Direct link, relationship coefficient, Sardinia
Subjects:Area 07 - Scienze agrarie e veterinarie > VET/02 Fisiologia veterinaria
Divisions:002 Altri enti e centri di ricerca del Nord Sardegna > AGRIS Sardegna, Olmedo > Dipartimento per la ricerca nelle produzioni animali > Settore genetica e biotecnologie
Publisher:Avenue media on behalf of Scientific Association of Animal Production (ASPA)
Publisher Policy:Depositato per gentile concessione dell'ASPA
Additional Information:Relazione presentata al 18. Congresso nazionale ASPA, Palermo, 9-12 giugno 2009.
Deposited On:15 Mar 2011 13:08

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