ABSTRACT:The specific features of free-radical polymerization of methyl methacrylate in the presence of a new initiating system, benzoyl peroxide-N,N-dimethyl-N-(methylferrocenyl)amine, are studied. Mutual influence of ferrocenyl-and amine groups on kinetic parameters of polymerization and on the microstructure of the resulting polymers is found. It is shown that the polymer obtained in the presence of this initiating system has predominantly syndiotactic structure.
Modern industrial milk processing based on high-tech processes has high demands to the quality of milk used as raw material for the production of a wide range of dairy products. Seasonality of milk production remains a significant problem for dairy cattle breeding. In some seasons, the supply of milk of optimal quality is rather unstable. The purpose of the work was to study the influence of season on the technological properties of milk during its processing into dairy products. As a result of research, it was found that the organoleptic properties of milk met the requirements of regulatory documents. The milk color changed with the seasons. A more intense yellowish tint in the milk color was noted in summer and autumn, which is associated with the carotene content in feed. The highest content of dry matter, SNF, fat and protein in milk was observed in winter, while in summer these values were the lowest. In the spring period, there is an increase in the mechanical contamination of milk up to group 2. In general, the bulk of milk has primary quality. The coagulation phase in cows’ milk was shorter in spring than in other seasons of the year (P <0.001) by 0’05 “- 2’35”, and it was longer in milk obtained in winter. The best speed to clot under the influence of rennet was the milk of cows in summer. Evaluation of milk for thermal stability, depending on the season of the year, showed that it has high thermal stability and can be used for processing into products with a high temperature of pasteurization and sterilization.
Aim: This study aimed to analyze the efficiency of carbohydrate-enriched rations fed to pasture and stall-housed cows.
Materials and Methods: Forty Holstein cows were divided into four groups of 10 animals each. The experiment lasted 305 days. All animals were kept under the same conditions, except for the amount of energy-carbohydrate rations fed. The control cows were on a standard diet. Experimental groups 1, 2, and 3 received a ration enriched with energy-carbohydrate components at 250, 500, and 700 g/head/day, respectively. Feed intake was measured on 2 consecutive days each month. During the balance trial, when young animals reached 13 months, feed intake was examined daily. Fodder, its residues, feces, and urine collected during the balance trial were used to determine nutrient digestibility and nitrogen exchange.
Results: Nitrogen balance was positive in all experimental animals. Cows in Group 3 made better use of the digested nitrogen. A biochemical blood test showed higher total protein content in the serum of the experimental cows than in the control by 1.47-3.49% (p≤0.05-0.001) in winter and 0.24-0.98% (p≤0.01) in summer. In winter, the serum protein level increased due to changed feeding routines and shorter exercise times, but did not exceed physiological requirements. The alpha- and gamma-globulins levels increased to 0.2-0.5 g/L in winter and 0.3-0.6 g/L in summer, and 0.5-1.4 g/L in winter and 0.1-0.2 g/L in summer, respectively. Beta-globulins decreased. The supplement had a positive effect on milk output, which increased by 67.1-137.3 kg (1.93-3.95%; p≤0.05-0.001) in the first 100 lactation days, then by 198.2-458.8 kg (2.39- 5.53%; p≤0.05-0.001) for the remaining days. All animals had a high milk yield coefficient, with the experimental groups having 0.64-2.64% more milk yield than the control. The lactation curves showed that the average daily milk yield of all experimental cows increased, then gradually decreased along the physiological trajectory from the 3rd month until the end of lactation. Milk quality analysis in the experimental groups indicated an increase in the dry matter content by 0.17- 0.27% (p≤0.001) in summer and 0.16-0.27% (p≤0.001) in winter; higher protein levels by 0.04-0.06% in summer and 0.03- 0.07% (p≤0.05) in winter; increased fat by 0.09-0.14% (p≤0.05-0.001) in summer and 0.09-0.13% (p≤0.05-0.001) in winter; increased density by 0.47-0.61°A (p≤0.05) in summer and 0.17-0.27°A in winter; and increased energy by 1.70-2.63% (p≤0.001) in summer and 1.57-2.54% (p≤0.01-0.001) in winter.
Conclusion: The energy-carbohydrate feed "Tanrem" can provide the required energy intake of Holstein cows. The maximum biological and economic effect wads attained at 500 g per animal.
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