Wool production traits and the incidence of yellow discoloration in five breeds of sheep at Botucatu.
Data obtained on 98 ewes over a period of 2 years were analysed. Ewes were kept on pasture and were given mineral supplements ad lib., lambings occurred from 15 April to 15 June, and lambs were weaned at 60 days of age. For Australian Merino, Polwarth, Corriedale, Romney and Ile-de-France ewes, the average greasy fleece weight was 2.88, 3.13, 3.27, 3.36 and 2.68 kg respectively, clean wool yield 78.96, 80.17, 79.58, 80.23 and 70.49%, clean fleece weight 2.28, 2.51, 2.60, 2.70 and 1.88 kg, and the incidence of yellow wool discoloration 1.82, 1.50, 2.27, 2.95 and 3.20%, the differences between breeds being highly significant. Year had a significant effect on all traits, and clean wool yield was affected by the amount of rainfall prior to shearing.