Influence of different participation of forages from grasslands in feeding ratio on effectiveness of dairy cattle feeding

摘要

During the years 2003-2006 a study was conducted on three dairy cattle breeding farms (Jastrzebiec, Falenty and Biebrza) that have different systems of feeding, forage types, and levels of animal performance. The aim of study was the evaluation of utilization of forages from permanent grassland in dairy cow feeding. The demand of net energy (UFL) for the production of 1kg of milk during each of two periods (summer and winter) of feeding (Biebrza and Falenty), and in the first and second halves of lactation (Jastrzebiec), and the allocation of feed from grasslands, arable lands and concentrates, were calculated. The highest consumption of feeds per kg of milk was recorded at Jastrzebiec (indoor feeding), lower at Falenty (periodical grazing) and thelowest at Biebrza (all-day grazing). The winter system of feeding at Falenty and Biebrza was the least effective (higher UFL energy consumption per kg of milk) than the summer system of feeding. At Jastrzebiec, in both periods, in spite of high contributions of concentrates in the feed, there was significantly lower consumption of energy UFL per kg of milk produced, than for winter feeding at Biebrza and Falenty.