For the past 5 years ram lam bs in an experimental Suffolk flock have been selected on an index o f live weight and ultrasonic fat and m uscle depths at 150 days of age. In 1989 lambs from the selection line showed significant responses o f about 7.8 and 8.7 per cent in index score for males and females respectively, com pared to lam bs from a control line. Preliminary results also show responses of about + 7.6 g lean and -10.2 g la t/k g carcass weight in the extensively-reared crossbred progeny of high index versus low index sires.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XV. Beef cattle, sheep and pig genetics and breeding, fibre, fur and meat quality., , 100–103, 1990
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