The article presents data on a scientific experiment conducted on quails of the Japanese breed. Data on the influence of the prebiotic drug «BioAxel» on the physiological parameters of quails have been established. The dynamics of the live weight of quails when feeding different dosages of the drug is estimated. In the experiment, the positive effect of different doses of the feed additive «BioAxel» on the average daily and gross growth of experimental birds (by 8,2–16,5% compared to the control) was established. The most effective method was feeding part of the BioAxel (5% of the feed weight) plus another part (4%) with water. A comprehensive veterinary and sanitary examination of quail slaughter products was also carried out when using the prebiotic drug «BioAxel»in the diet. It was found that this drug does not have a negative effect on the quality of meat. At the same time, the indicators of biological safety are within the limits of the norm established by current regulatory documents. In terms of nutritional value, the meat of quails raised with the use of the prebiotic drug «BioAxel» exceeds the meat of quails from the control group. The content of essential amino acids significantly increased in poultry meat of the experimental groups, and the total biological value in the test with Tetrahymena pyriformis exceeded the control parameters.
In a scientific and economic experiment, it was studied the effect of the multifunctional probiotic preparation Bionorm K on the stabilizing digestion process and dairy cow milk productivity-increasing during the transition from one ration composition to another.
The probiotic drug Bionorm K is a multi-strain product, which consists of 14 strains of bifidobacteria and lactobacillus. Moreover, it has a protective shell, which retains the microorganism activity after passing the acid barrier of the cow's abomasum.
It was found that the diet probiotic addition is advisable to start from the first day after calving and continues for 45 days in a dose of 5 g per head per day.
The experimental group animals outpaced the control animals by the consumption of dry matter of the diet by 2.6 %. At the same time, the likelihood of developing digestive disorders and the incidence of diarrhea is reduced by 2-2.5 times. At the end of the studies, none of the cows suffered from digestive upsets.
Besides, cows, which injected the probiotic to the ration, had improved the ruminative processes due to an increase in the frequency of their contractions compared to the control. Already on the fifth day, the number of ruminal contractions at the experimental animals was 12.5% higher than the control. The higher intensity of rumen work at the experimental cows was maintained during the entire time of probiotic addition into the diet, although the difference with the control was constantly decreasing.
The feed probiotic addition promotes a gradual increase in milk production by 7.64 % and an increase in the fat level in milk by 0.02 % compared to the control. At the same time, feed costs of 1 kg of milk decreased by 5.6 %.
The probiotic stabilizes the biochemical composition of the cow blood quickly and increases the gamma globulin level at blood serum, which indicates an increase in the immune status of cows in the experimental group.
The research results will form the basis for the analysis of greenhouse gas emissions with various technologies of cattle keeping in order to identify technologies that can ensure minimum level of greenhouse gas emissions.
Relevance. Single-type feeding of dairy cows has a significant advantage over traditional split ration feeding due to the minimal frequency of changes in the composition of the ration and the higher stability of feeding. However, in the process of such a feeding method, it is still necessary to change the diet composition during the seasonal transition from the last year feed to the current year feed. This change leads to significant feed stress for animals, which negatively affects the intensity and nature of cicatricial digestion, and, consequently , productivity. At the same time, at least 100-150 kg of the annual milk yield of a cow is lost. For this reason, the development of a method for eliminating the inevitable cows' stress during the change of feeding seems relevant.Methodology. Scientific and economic experience on dairy cows of the first lactation phase was carried out in accordance with generally accepted methods. The biochemical composition of the blood was studied, observations of the ruminatory processes were carried out, the data were processed by modern methods of variation statistics using the EXCEL program.Results. As a result, it was found that during the transition from one diet composition to another, it is advisable to introduce a probiotic based on lactic acid bacteria into dairy cows diet. The use of a probiotic can be considered as a preventive measure for digestive disorders caused by changes in the composition of the diet. The use of a probiotic helps to stabilize the ruminal processes in cows, which is reflected in an increase in the frequency of cicatricial contractions. Probiotic effect on the intestinal microbial community, increases the immune status of the body by increasing the level of protein, gamma-globulin fractions in its composition, as well as increasing the reserve alkalinity index.
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