This study aimed to establish whether increased use of AI in the Australian stud Merino industry has led to increased crossstrain breeding and a resultant lowering of heterosis (H%) in crosses between strains. 1363 pure-strain and cross-strain progeny from Peppin, Collinsville and Bungaree parents were measured at 12 months of age for wool and liveweight traits. H% was positive for average fibre diameter (1.2%) and liveweight (1.1%) and negative for yield (-4.8%) and clean fleece weight (-2.3%). The results lend qualified support to the hypothesis.

I. Purvis

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., , 220–223, 1990
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