STANDARDS FOR REQUIREMENTS STANDARDS FOR METABOLIC ENERGY AND CRUDE PROTEIN FOR COWS OF HOLSTEIN DAIRY CATTLE POPULATION OF DOMESTIC SELECTION DURING THE 1ST THIRD OF LACTATION

Holstein cows show the highest genetic potential for dairy performance and a set of traits for better adaptability to industrial technology. However, feeding and management of Holsteinized animals at intensive use should be given more attention than black-and-white animals adapted to the climatic conditions of the republic. The research subject were cows of Holstein dairy cattle population of domestic selection according to black-and-white breed aged 2-6 years, taking into account milk yield as per lactation of over 8 thousand kg of milk, selected according to the principle of pair-analogues in 3 groups of 7 animals each. The experiment was carried out in conditions of SE ZhodinoAgroPlemElita in Smolevichi district of Minsk region during spring-summer period of 2019. The paper presents the results of studying the efficiency of impact of various norms of requirements for metabolic energy and raw protein (100, 110 and 115 %) in the diets for highly productive Holstein cows of domestic selection according to dairy black-and-white breed during the 1st third of lactation on performance and quality of milk, as well as homeostasis, digestibility of organic matter and use of nitrogen in animals’ body. The positive effect of moderately elevated requirements for metabolic energy and crude protein (by 10 %) in diets with a predominance of bulky feed in relation to concentrates (43.5:56.5) compared with that in the control (39.1:60.9) on the above studied indicators.

высокопродуктивные голштинские коровы, обменная энергия, сырой протеин, обмен веществ, рационы, highly productive Holstein cows, metabolic energy, crude protein, metabolism, diets

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