The effect of feeding diets markedly differing in the proportion of grass and maize silages on bovine milk fat composition
2009
Samková, E. | Pešek, M. | Špička, J. | Pelikánová, T. | Hanuš, O.
Ten Czech Pied cows in the mid-lactation stage were fed diets based on grass silage and maize silage. The composition of milk fats differed. The proportions of even-chain saturated fatty acids (SFAs) up to C<sub>14:0</sub> were insignificant and the content of C<sub>16:0</sub> was significantly higher (<i>P</i> < 0.05) when feeding a diet based on maize silage, while the proportions of the individual polyunsaturated fatty acids (PUFAs) were significantly (except for C<sub>18:2</sub>) higher when feeding a diet based on grass silage. The total SFA proportions were 67.60 and 62.93% (<i>P</i> < 0.05) of maize and grass silages, respectively, while an opposite relation was observed for the sum of PUFAs (3.56 and 4.74%; <i>P</i> < 0.001). Feeding of grass silage resulted in a significantly lower proportion of hypercholesterolaemic fatty acids C<sub>12:0</sub>, C<sub>14:0</sub> and C<sub>16:0</sub> (49.38 and 44.98%, respectively; <i>P</i> < 0.05) and in lower values of the atherogenic index (3.03 and 2.44; <i>P</i> < 0.05). Thus, the results could be used for the improvement of milk fat composition.
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