The relationship between splittability of the feed protein and milk productivity

Abstract

One of approaches of a solution of the problem of a feed protein in dairy cattle breeding is improved efficiency of assimilation of feed ingredients in a multi-chambered stomach of ruminants by purposefully changing these processes by the method of appropriate feed selection with a favorable ratio of nutrients in them, as well as the use of special preparations that optimize microbial fermentation of feed. In view of the above the scientific and economic experiments on sensitivity analysis of the nutritional intervention of ruminal digestion regulators “I-Sak 1026” and “Novatan 50” on milk productivity of animals were run for cows in the period of increasing the milk yield. These studies on feeding yeast culture “I-Sak 1026” were conducted under the conditions of Commercial dairy farm LLC “AK Bars Agro” of Arsky District of the Republic of Tatarstan (RT), and preparation “Novatan 50” – in the Central branch of CJSC “Biruli” of Vysokogorsky district of RT. As a result of the conducted studies, the use of these regulators has led to a positive shift in the control of the ratio of splittable and non-splitting feed protein in the diet and increase in milk productivity. Thus, the use of “I-Sak 1026” (10 g per animal per day) and “Novatan 50” (12 g per animal per day) increases the average daily milk yield in terms of the basic fat content, respectively, by 2.9 kg or 16.0 % (p<0.05), by 2.97 kg or 13.3 % (p<0.05) while optimizing the qualitative composition of milk. With the intervention of “I-Sak 1026” the mass fraction of milk fat increased by 0.14 % (p<0.05), of protein - by 0.24 % (p<0.01) in absolute values. When using “Novatan 50” there is a tendency of increasing the content of fat milk and protein milk, respectively, by 0.13% and 0.05% compared with the control.