Groups of 25 weaned lambs sampled from properties on the Northern Tablelands of New South Wales were tested in a common environment for resistance to the abomasal parasite Haemonchus contortus. Three flocks from each of four strains were represented. Although there were large differences between strains there was insufficient evidence to conclude that strain contributed significantly to the total variation in resistance. Large differences between strain means were apparent but these were not statistically significant due to substantial variation between flocks within strains. Given the strong genetic links between flocks within strains, the results suggest that there are powerful and enduring environmental influences on lambs during the first 8-12 weeks which are expressed as altered resistance 3-5 months later.
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., , 135–138, 1990
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