Abstract
The completeness of the provision of the body of highly productive cows with the necessary set of nutrients depends on the set of feeds included in their diet, as well as on their quality. The purpose of the research is to study the effect of silage with the biological preservative “GreenGrass 3×3” on the technological properties of milk from cows of Holstein and Ayrshire breeds. It is found that the morphological and biochemical composition of the blood in the animals of the experimental groups significantly improves approaching the optimal parameters. Feeding lactating cows with silage in feed mixture from lucerne prepared with bio-preservative increases the average daily milk yield by 20.5% in the Holstein breed and by 26.9% in the Ayrshire breed. The quality of milk is improved by the increase in the mass fat fraction by 0.10-0.13% respectively, the mass protein fraction - by 0.10-0.14%, including casein - by 0.14-0.19%. In the general structure of milk proteins, the mass fraction of casein increases, while the mass fraction of whey proteins, on the contrary, decreased by 2.0-2.2%. It is very important that the proportion of γ-caseins, which do not clot under the influence of rennet, decreased by 0.5-0.9% in the test samples. As a result, the duration of clotting by rennet decreased by 13.8-12.1% and the loss of dry matter with whey - by 1.3-2.1%, the yield of casein clot increased by 5-4% and its density increased by 0,37-0.22 g / cm2. All these aspects show the increase in the technological properties of milk in cows from the experimental groups.
Highlights
The experience of scientists and specialists in the field of dairy cattle breeding shows that a further increase in gross milk production is possible only when highly productive animals are used at modern dairy complexes
The study of blood samples was carried out using the analyzer “VA-88”, the chemical composition of milk was carried out using the analyzer “Laktan 1-4”, the fractional composition of milk proteins were studied using the apparatus of capillary electrophoresis “Kapel 105M” in the Testing Research Laboratory of Samara State Agrarian University, technological properties of milk were studied
Silage with a bio-preservative, getting into the body of cows, during the digestion and assimilation of nutrients had a positive effect on the process of lactogenesis, as a result of which the mass fraction of casein in the composition of milk proteins increased in the Holstein breed by 2.0% (P
Summary
The experience of scientists and specialists in the field of dairy cattle breeding shows that a further increase in gross milk production is possible only when highly productive animals are used at modern dairy complexes. The main reason that moderates the breeding of highly productive animals is the problem of meeting the protein needs of their bodies. Due to the fact that bulky feed is the main source of nutrients for cattle, it is possible to increase the protein content in the diet only by increasing legumes in the fodder structure. Traditional fodder crops with a high content of vegetable protein are perennial grasses of the legume family: alfalfa, clover, vetch, Galega orientalis, etc. In recent years, when harvesting silage, various preservatives have been widely used, which improve the quality of the finished feed and reduce the loss of nutrients during storage. We are not talking about the increase in the number of lactic acid
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