Abstract
The effect of feeding dietary fat supplements on the fatty acid composition of goat milk was examined. Inclusion of canola and soybean ( 80 20 ; w w ) oilseed supplement protected from ruminal hydrogenation, significantly increased the proportion of C18:1 (oleic acid), C18:2 (linoleic acid) and decreased the proportion of C16:0 (palmitic acid) and C14:0 (myristic acid), while there was a small increase in C18:0 (stearic acid). Feeding protected cotton seed significantly increased C18:2 and C18:0, but there was a reduction in C18:1 while the C16:0 was unchanged. When combinations of protected cotton seed and protected-canola soybean ( 80 20 ; w w ) were fed, a level of 20–25% incorporation of protected cotton seed was sufficient to inhibit the desaturase enzyme, with an increase in the proportion of C18:0. In contrast, feeding calcium salts of fatty acids, a predominantly saturated fatty acid supplement, increased C16:0 and reduced C10:0 (decanoic acid) and C14:0. Feeding fat supplements of different fatty acid compositions and varying levels of inertness in the rumen will enable significant manipulation of the fatty acid composition of milk fat.
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