The fatty acid composition were estimated by Medium Infrared Spectrometry. The differences within and across breeds were estimated using mixed model and the components of variance were estimated by REML. Differences between breeds (Dual Purpose Belgian Blue, Holstein-Friesian, Jersey, Montbeliarde and non Holstein Meuse-Rhine-Yseel type Red and White breeds) were shown. The difference within breed was approached by estimating the repeatabilities. The high values obtained might suggest a high heritability for each fatty acid components. Finally, this study has also shown that the individual animal effect was more important than the breed effect. In conclusion, the nutritional quality of milk might be improved by choice of breed or by a classical animal selection.

H. Soyeurt, P. Dardenne, P. Mayeres, C. Croquet, S. Vanderick, C. Bertozzi, Nicolas Gengler

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 01.59, 2006
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