The content of fatty acids in the fat of goat milk and its variation during lactation
1990
Boros, V. | Stevonkova, E. (Vyskumny Ustav Mliekarensky, Zilina (CSFR))
Variations of the spectrum of fatty acids in the fat of goat milk were investigated during the lactation period. Samples of bulk milk were taken to be analyzed in a flock of 100 goats of domestic breed; the samples were taken in thre-week intervals, from morning milk, during the whole lactation period, which was divided into spring, summer and autumn parts. With the exception of the spring period, when the diet contained prevailingly hay and concentrate supplements, the goats were exclusively grazing in the pasture and they were not given any other feeds. Analyses of the fat of goat milk indicated during the lactation period variations in the content of short-chain acids - butyric, caproic and caprylic ones, their content decreased by 31.8 per cent and 45.9 per cent. These variations were statistically significant at the significance level of 0.05. The contents of linoleic and linolenic acids also decreased during lactation, by 26.7 per cent and 42 per cent, respectively, these variations being statistically significant (P0.05) The dependence of the contents of the above-mentioned fatty acids on the lactation period is also confirmed by the coefficients of correlation which were calculated for butyric, caproic, caprylic and linolenic acids: -0.767, -0.704, -0.766 and 0.546, resp. On the other hand, the contents of capric and myristic acids increased significantly by 16.9 per cent and 17.6 per cent, respectively, during lactation, the correlation dependence having the values r
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