A (CA)n microsatellite (MS) in the 5’ flank of the IGF-I gene and an RFLP in the growth hormone (GH) gene were tested for effects on production traits in Australian Holstein-Friesian cattle. Three alleles (127, 129 and 131 bp) at frequencies of 3.7%, 78.9% and 17.4% were found for the IGF-I MS and two alleles, Val12" and Leu127, with frequencies of 18% and 82% were observed for the GH RFLP. The quantitative effect of the markers on milk production traits was estimated from 3,811 lactation records using an animal model. The IGF-I MS had no effect on milk production traits. The Leu127 allele of GH favoured higher production of milk, fat and protein and was dominant to Val1
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 25: Lactation; growth and efficiency; meat quality; role of exotic breeds in the tropics; design of village breeding programs; n, , 43–46, 1998
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