Nowadays, a new science-based approach to animal feeding is required to create conditions for the full realization of their potential with intensive use of livestock. This research was an experimental test that aimed to evaluate effective feed intake of energy supplements TirsanaBSC by high-yield Ayrshire cows in the transit period. As a result of the supplement application the daily milk yield increased during 100 days of milking cows. The amount of milk fat and protein increased as well. There was an increase in carotene, glucose, pyruvic acid in the blood of experimental cows and reducing non-esterified fatty acids (NEFA). Adding the supplement Tirsana BSC to the diet of highly productive Ayrshire cows improved the quality of their colostrum.

A key factor in realizing the genetic potential of animal productivity is their complete feeding, in the organization of which the leading role belongs to the intensive system of feed production and the feed industry including the development of different balancing additives. In highly productive herds it is most problematic to balance the rations of down-calving cows and after their calving, since there is a physiological limitation of feed consumption and as a result a lack of energy and nutrients. At this stage there is a negative energy balance. After calving (and in general during the period of increasing the milk yield) to achieve high milk yields it is necessary to provide animals with feed of increased energy value, such as concentrates. However, high consumption of concentrated feed leads to acidosis and other diseases, which is accompanied by a decrease in milk yield and fertility. Special feed supplies are required to replenish energy. Due to the relevance and practical significance of the issue we have carried out a research aimed at studying the effect of the energy additive Tirzana BSK on the productivity of Ayrshire cows. The results of research on the use of the energy energy additive Tirzana BSK during late dry period and during the period of increasing the milk yield for Ayrshire cows with the yield of 8800 kg per lactation have been presented in the article. It has been found that the introduction of Tirzana BSK contributes to increasing milk productivity, reducing expenditures of feed per unit of production and reducing the time from calving to effective insemination. It has been experimentally proved that it is more effective to use the additive from late dry period to the middle of the period increasing the milk yield, which determines an increase in milk yield by 12,4 %, a reduction in the duration of the open days period by 19 days, and the increase in the profitability of milk production from 25,1 to 31,7 %.

Приведены результаты научно-хозяйственного опыта, проведенного в условиях хозяйства в Вологодской области. Изучено влияние жидкой энергетической добавки на основе смеси пропиленгликоля, глицерина и гепатопротектора на продуктивность и качество молока коров айрширской породы с удоем 8,8 тыс. кг за лактацию и их воспроизводительные способности. Исследования показали, что поедаемость кормовой смеси коровами позднего сухостоя и в раздой составляет в среднем 88—90%, прослеживается тенденция к лучшему поеданию корма животными опытных групп при применении изучаемой энергетической добавки. Подтверждением этому являются результаты наблюдений за пищевым поведением коров в начале лактации. Подопытные животные затрачивали ежедневно на потребление кормов 6,5 ч за 17—20 приемов. В разрезе групп установлена достоверная разница по продолжительности жвачки. Суточные удои коров опытных групп за первые 100 дней лактации достоверно превышали продуктивность контрольных животных на 12,4 и 13,2% (39,1 и 39,4 кг против 34,8 кг). Содержание в молоке белка и жира в разрезе групп резких отличий не имело. Увеличение продуктивности и снижение продолжительности сервис-периода на 19 дней (со 102 до 83 дней) выявлено при использовании изучаемой добавки в количестве 300 г на 1 голову в сутки в течение 3 мес, включая транзитный период. Эффективность применения добавки очевидна и с экономической стороны: в период раздоя на каждую корову только за счет увеличения надоев в опытных группах получена дополнительная выручка, которая в 2,7 раза превосходила затраты на энергетик. The article presents the results of scientific and economic experience conducted in the conditions of a farm in the Vologda region. The effect of a liquid energy Supplement based on a mixture of propylene glycol, glycerol and hepatoprotector on the productivity and quality of milk of Ayrshire cows with a milk yield of 8.8 thousand kg per lactation and their reproductive abilities was studied. Studies have shown that the feed mixture is eaten by cows of late dead wood and in the distribution is on average 88—90%, there is a tendency to better feed consumption by animals of experimental groups when using the studied energy Supplement. This is confirmed by the results of observations of the feeding behavior of cows at the beginning of lactation. Experimental animals spent 6.5 hours per day on feed consumption for 17—20 meals. In the context of groups, a significant difference in the duration of chewing gum was established. The daily milk yield of cows in the experimental groups for the first 100 days of lactation significantly exceeded the productivity of control animals by 12.4 and 13.2% (39.1 and 39.4 kg versus 34.8 kg). The content of protein and fat in milk in the context of groups had no sharp differences. An increase in productivity and a decrease in the duration of the service period by 19 days (from 102 to 83 days) was revealed when using the studied Supplement in the amount of 300 g per 1 head per day for 3 months, including the transit period. The effectiveness of the additive is also obvious from the economic side: during the milking period, additional revenue was obtained for each cow only due to an increase in milk yield in the experimental groups, which was 2.7 times higher than the cost of energy.

No abstract

Under the conditions in the Vologda region the organization of complete feeding of cows in highly productive herds is especially difficult, since the range of harvested feed is reduced and their quality issues remain problematic. In the region many of the normalized nutrients in the rations of dairy cattle are limiting, which reduces the effi ciency of production of its products. The purpose of the work was to increase the effi ciency of milk production when using the energy additive Tirzana BSK in the rations of highly productive cows of Ayrshire breed. Studies on the eff ectiveness of the use of the energy additive Tirzana BSK were carried out in the winter-stall period of housing cows on the basis of the agricultural complex “Maysky Breeding Farm” in the Vologda region. A comprehensive research of the technology of milk production with the use of an energy additive in the rations of cows was carried out It was found that as a result of feeding the energy additive Tirzana BSK, there is an improvement in the digestibility of nutrients in rations, especially organic matter and fi ber. Higher digestibility coeffi cients in animals of experimental groups are obviously achieved due to the optimization of microbiological processes in the gastrointestinal tract due to the components of the additive, which includes propylene glycol, glycerin, polysaccharides and a complex of biologically active substances. Feeding Tirzana BSK additive has a positive eff ect on increasing milk productivity without reducing product quality. New data on the animal husbandry and economic feasibility of using the energy additive in feeding cows with a milk yield of over 8500 kg of milk per lactation have been obtained, which make it possible to identify additional reserves for increasing milk yields with rational expenditure of feed. The use of the energy additive Tirzana BSK in feeding highly productive cows of Ayrshire is economically justified, especially during periods of late dry period and the first 100 days of lactation.