For the first time, in the conditions of the Magadan region, have been carried out studies on the use of a feed additive (FA) based on mountain pine in combination with lichens in the rations of young cattle (C) of Holstein breed and cross-bred young of Holstein and Aberdeen Angus breeds of the dairy and growing period. The use of FA positively affects the growth rate, daily average growth, blood counts, young growth resistance and digestibility of feed. The live-weight of the experimental gobies of Holstein breed at the age of 16 months, which additionally received the FA ration, exceeded the rate of the control group up to 2.15 kg (0.58%), the crossbreeds of the Aberdeen-Angus breed exceeded the rate of a control group up to 9.55 kg (2.3%) (P≤0.05). The relative growth rate (according to S. Brody) of gobies at the age of 16 months, which got FA was higher than of gobies of the control groups. The growth rate of experimental gobies of Holstein breed is 0.12% higher, and of crossbred gobies is 2.57% higher respectively. A study of the hematological composition of the blood of experimental half-blood gobies of the Aberdeen-Angus breed showed that relative to the control group, the concentration of eosinophils increases by 0.4%, monocytes 0.8%, lymphocytes by 7.2%, the concentration of band neutrophil decreases by 1%, segmented neutrophils by 7.4%. The young of the experimental groups had better digestibility of dietary nutrients and feed costs per 1 kg of growth in comparison with the control groups.

It was undertook a number of studies on the effects of introducing new non-conventional vegetable supplementary feeds in the diets of dairy cows and industrial laying hens. Plants are not cultivated for their production, but they refer to wild crops growing in the natural habitat in sufficient quantities. The purpose of the research was to determine the effect of introducing non-conventional vegetable supplementary feeds on the productive qualities of cows and laying hens; quality of products (milk, eggs); nutrient digestibility (use) of laying hens and reproductive functions of cows; and to identify the economic efficiency of using these supplementary feeds by changing feed conversion ratio. The composition of supplementary feeds for cows included sea furbelow, creeping pine needles, lichens. Supplementary feeds consisting of sea furbelow flour and wild crops were introduced into the diet of laying hens: fireweed or rosebay willowherb, stinging nettle, and creeping pine needles. The studies were conducted at the agricultural enterprises. The experiments were performed on Ayrshire and Holstein cows of different lactation periods and the Hisex White laying hens of various age and productive periods. Randomized regimens were used, including 2-5 levels of feeding. The groups of cows were formed by the analog to pair matching method; laying hens were formed by the analog to group matching method and were kept in equal zoohygienic conditions. During group formation, no significant differences in body weight and productivity between the formed groups were revealed (P> 0.05), which indicates the correct selection of groups for the research. As a result, cows improved reproductive functions, increased milk yield, milk fat content and feed conversion; hens showed the intensification of metabolic processes, contributing to an increase in productivity, feed conversion and egg quality (P 0.05), which indicates the effectiveness of using new supplementary feeds.

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In the conditions of the Magadan region researches on the use of a feed additive based on seaweeds (Laminaria Bullatelancet-likelargekelp, fucus Fucusevanescens C. Agardh) in combination with lichens (Cladonia alpestris and Cetraria islandica) in the diets of young cattle of mixed cattle were conducted. Experimental and control groups of 15-17-month-old young animals were matched by the pairwise method. The groups included first-generation crossbred Hereford and Aberdeen Angus steers. Young animals of the experimental group received daily feed supplement in addition to the basic diet: kelp in an amount of 120 g/head with lichens 50 g/head/day. The stimulating effect of the supplement on the body is due to the content of a wide range of biologically active substances that are a factor in the growth and development of farm animals and have a positive effect on their immune system. Inclusion of the feed additive into the diets increased the absolute weight gain of the experimental bulls by 5,62 kg, the relative gain by 12,53%, and the average daily gain by 93,8 g (12,55%) as compared to the control bulls (p ≤ 0,001). The relative growth rate according to S. Brody was 1.31% higher in experimental young animals from birth to 17 months of age compared to the control. The use of the feed additive improved the physiological condition and resistance of the young animals of the experimental group. The content of erythrocytes in their blood increased by 0.32 million/μL (5.18%), hemoglobin by 1.1 g/dL (11.48%), and calcium by 0.06 mmol/L (2.37%).

For the first time, in the conditions of the Magadan Region, studies were carried out on the use of a feed additive (FA) prepared from dwarf pine (mountainpine) in combination with lichens in feeding young cattle of the Holstein breed and crossbred young animals of the Golstein and Hereford breeds. Over the period of the experiment, the absolute increase of the experimental bulls exceeded the indicators of the control groups: young Holstein breed by 2.15 kg (0.58%), hybrids by 6.35 kg (1.51%). The relative growth rate of experimental bulls according to Brody was higher than that of bulls in the control groups: bulls of the Holstein breed by 0.12%, crossbreeds by 0.77%. The use of crossing low-productivity dairy cattle with bulls of meat breeds makes it possible to obtain interbred hybrid animals of the I and II generations. The production of beef from crossbred young stock is characterized by greater economic efficiency in comparison with the fattening of super-renovated young Holstein breed. In the experimental group of a hybrid of the Holstein and Hereford breeds of the 1st generation, this indicator was 7.2 energy feed units (EFU), which is 7.7% lower than in the control one, and 13.25% lower than in the experimental group of the Holstein breed.

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