Daniel Claro M.1
Mating weight and infertility rate were measured in Magallanes for Corriedale flocks from 1971 to 1973. In Scrub Country a total of 1.380 adult ewes and 422 two-tooth ewes were controlled. In Tussock Country 1.018 adult ewes and 212 two-tooth. For adult ewes in Scrub Country a mating weight of 49.2 Kg (37-69 Kg), 0.4% of sheep being below 40 Kg and infertility rate of 15.9% were found. In Tussock Country mating weight was 42.6 Kg (30-66 Kg), 14% ewes below 40 Kg and infertility rate of 22% were found, the difference in mating weight and infertility being significant (P < 0.01).
1Ing. Agr., M. Agr. Sci., Programa Producción Ovina. Estación Experimental La Platina, Instituto de Investigaciones Agropecuarias (INIA) , Casilla 5427, Santiago, Chile.