Milk yield and composition in cows fed rations with different energy and protein resources
2001
Strzetelski, J. | Krawczyk, K. (Research Institute of Animal Production, Balice (Poland). Dept. of Animal Nutrition) | Kowalczyk, J. | Osieglowski, S. | Pustkowiak, H.
The results of the experiment showed that despite of the rations being balanced for energy and protein, the type of dietary protein can affect the yield of milk and its components in high-yielding cows. The extent of starch degradation in the rumen appeared to be of limited influence on these parameters. The highest milk protein content was obtained with the lupin-barley combination indicating that adequate synchronization of energy and protein for bacterial yield in the rumen may affect the level of protein in milk. Increased intake of rape seeds oil had a favourable effect on milk and lactose yield without a significant effect on milk composition. The effect of rape seeds on milk performance was not related to the other feed components in therm of the rate of protein and carbohydrate degradation, as the protein x starch x oil interaction was not significant. The source of protein, starch and oil from rape seeds had only a slight effect on changes in the fatty acid composition of milk fat
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