Milk Fatty Acids Predicted by Mid-infrared Spectroscopy in Mixed Dairy HerdsReportar como inadecuado

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Agriculturae Conspectus Scientificus, Vol.78 No.3 September 2013. -

Over the last years, healthy food has gained interest among consumers, especially with regard to the fat content of livestock products which has been associated to the risk of cardiovascular diseases. Individual milk samples n = 12,624 of 2,977 Holstein-Friesian HF, Brown Swiss BS and Simmental SI cows from 39 multibreed herds were analyzed for fat content, protein content, casein content and somatic cell count using mid-infrared spectroscopy MIRS. Daily milk yield was also recorded. Groups of fatty acids FA, expressed as percentage of milk fat, were predicted by MIRS: they were saturated SFA, unsaturated UFA, monounsaturated MUFA and polyunsaturated PUFA FA. Data were analyzed with a linear mixed model including the fixed effects of month of sampling, parity, days in milk DIM, herd, breed, and interactions between parity and breed, and DIM and breed. The random effects were cow nested within breed and residual. Milk of HF cows exhibited the lowest percentage of SFA 70.45% and the highest of UFA 31.20%, and milk of SI cows was intermediate between that of HF and BS breeds for all groups of FA. The values of groups of FA across DIM were similar for the different breeds. Results from this study indicate that, under similar environmental and management conditions, milk of HF exhibits better FA profile than milk of BS and SI.

milk fatty acid; multibreed dairy herd; mid-infrared spectroscopy

Autor: Paolo Gottardo - ; Department of Agronomy, Food, Natural resources, Animals and Environment DAFNAE, University of Padova, Viale d



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