Abstract

MUELLER, J.P; VOZZI, P.A; GIOVANNINI, N  and  ALVAREZ, J.M. Beneficio del progreso genético en ovinos de la Argentina. RIA. Rev. investig. agropecu. [online]. 2016, vol.42, n.3, pp.307-316. ISSN 1669-2314.

The economic benefit of genetic improvement observed in stud flocks of the Horned Merino, Corriedale and Polwarth breeds using Provino, the Argentinean sheep genetic evaluation service, was analysed. With population statistics and reproduction parameters estimated from reference production systems of each breed, the number of stud ram progeny was calculated. Using gene flow methodology, genetic expressions were calculated for each lamb throughout his life and that of its descendants. The benefit of 10 years of genetic improvement in the stud flocks accumulated over 20 years in the general flocks and discounted at an annual rate of 5% turned out to be 7.70, 0.93 and 0.12 million USD for the Horned Merino, Corriedale and Polwarth populations, respectively. For the first two breeds a three tier structure was modelled and for the Polwarth breed a two tier structure was modelled. Sensitivity analysis indicated an ample scope to increase the economic benefit of genetic improvement in Argentina. Promotion policies for further genetic improvement in the stud flocks and increased dissemination of rams should be encouraged.

Keywords : Selection; Genetic structure; Merino; Corriedale; Polwarth; Provino.

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