Trupa Aiga

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EFFICIENCY OF CONCENTRATED FEED EXTRUSION IN DAIRY COWS FEEDING

Trupa Aiga, Silina Anita, Kreituzis Eriks

Abstract
The cows were allotted into two groups according to the analogue principle (n=2x50). Lactation dairy cows were included in the trial in the initial lactation phase with the average milk yield of 30.73 kg per day, fat content 3.92 % and 3.16 % protein content in milk. During the extrusion process, the protein content decreased, including all the amino acids, at the expense of hydrolysis of starch, but the amount of glucose in the grain increased. The extrusion process was powerful enough to almost completely, i.e., on 99.9 %, reduce the total quantity of bacteria in grain, to halve the number of mould and to completely destroy yeast bacteria populations in grain samples. Within 150 days of study, milk yield in the experimental group of cows was approximately 0.91 to 1.27 kg higher than that in the control group of cows. In addition, the difference in yield in favour of the experimental cows showed a tendency to increase.

Key words: dairy cows, extrusion grain, milk