The presence of coarse fiber in newborn animals indicates the viability and high productivity of animals in adulthood, therefore, when breeding meat-wool sheep of the Jalghin merino breed, flocks of lambs should be formed according to the amount of coarse fiber at birth. It was found that in all groups, animals born with coarse fiber at all age periods had superiority in live weight over animals born without coarse fiber. In group I of the fine line, 72.5% were born without coarse fiber, and 27.5% with coarse fiber. In group III of the strong line, 13.6% were born without coarse fiber of lambs, 86.4% with coarse fiber. In the second group of the medium line, there was practically the same ratio of without and with coarse fiber lambs and amounted to 48.7% and 51.3%, respectively. It was found that, at birth and at 4 months of age, in terms of live weight, rams with coarse fiber, regardless of their linearity, outnumbered their peers. At 14 months of age, the superiority of animals of group III in live weight in general over their peers in groups I and II was 8.8% (P <0.001) and 5.4% (P <0.001). In turn, the rams of the III group that were born with coarse fiber had a significant superiority over the coarse-fibered peers of the I and II groups by 5.6% (P <0.001) and 2.8% (P <0.001). The same tendency was noted for the rams that were born without coarse fiber, animals of the III group (strong) had a significant superiority over their peers (fine and medium).

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The effect of complete compound feed (CCF) with a different level of crude fat, due to the use of sunflower oil (SO), on the qualitative characteristics of muscle tissue in young Linda geese was studied. The introduction of SO into the composition of CCF contributed to an increase in the concentration of linoleic acid in it by 43–47%. No statistically significant differences were found in the chemical composition of the muscle tissue of the chest and legs. The best flavour had the meat of geese fed CCF with introduction of SO. The inclusion of SO in goslings rations did not negatively affect the serum biochemical composition of young geese up to 60 days of age.

This article studied the reproductive capacity and milk production of ewes with various combinations of lines. It was found that the highest fecundity was possessed by animals of the III group from the interline selection of rams of the ME-50 line and ewes of the AC-30 line and amounted to 139.6%, which is higher than that of their peers of the I, II and IV groups by 4.2; 9.8 and 4.8 abs. percent. With intralinear selection, the animals of group I (line ME-50) were the best in this indicator, compared with animals of group II (line AC-30) by 5.6 abs. percent. The best safety of lambs before weaning (4.5 months) was observed in animals of group IV obtained from interline selection of rams of the AC-30 line and ewes of the ME-50 line and amounted to 93.5%, which is 1.2% higher than in their peers in groups I, II and III; 1.7 and 1.0 abs. percent. The highest milkiness of ewes with intraline selection, both for little rams and for young ewes, was in animals of group I (line ME-50), which surpassed in milkiness their peers of group II (line AC-30) reliably for little rams by 18.3% (P < 0.001), and for young ewes by 3.1% (P> 0.05). The superiority in milkiness of animals of group III over their peers of group I was 6.8% in little rams (P <0.001), and in young ewes–by 5.6% (P <0.01).