Influence of growing heifers intensity on milk productivity of red-and-white cows
Therefore the intensification of the dairy cattle breeding industry gives priority to the realization of the genetic potential of dairy productivity of cows, the preservation of their health, good reproductive qualities and the duration of economic use.In this regard, the study of the influence of the intensity of cultivation on the productive qualities of red-and-white cattle is of scientific and practical importance.5 groups of red-and-white animals (20 heads in each group) were formed to conduct the experiments. Feeding was planned to receive an average daily increase in the first experimental group within the range of 850-900 g, the 2nd group received a diet planned for 800-850 g, the 3rd group for 750-800 g, the 4th for 700-750 g and the 5th household diet for 650-700 g of average daily growth. Based on the conducted research, it can be concluded that red-and-white animals are able to grow live weight at a young age, which indicates earliness of animals. Heifers of the first experimental group reached a live weight of 380 kg at 13 months of age, the 2nd experimental group at 14 months, the 3rd experimental group at 15 months, the 4th experimental group at 16 months, and the control group at 17 months. From heifers that reached a live weight of 380 kg and sired at the age of 14-15 months, they were subsequently milked for the first lactation of 6192 and 6345 kg, for all lactation of 24684-24944 kg of milk.