Quality of reproductive ewes under conditions of central Yakutia

The analysis of reproductive qualities of domestic sheep at purebred cultivation and crossing in the conditions of the Central Yakutia is carried out. The studies were carried out on the basis of the existing laboratory of agricultural products processing and biochemical analyses at the Institute. Production experiments were performed in the farm "Mayak" Namskiy ulus on the Romanov sheep and the Transbaikal fine-wool breeds. It is established that the lambing the ewes of Romanov breed took place in January - March, the Transbaikal fine-wool - in December - February. It was found that the highest multiple pregnancy, when crossed with argali × chubuku × Romanov sheep differed sheep of Romanov breed in an average of 2.66 sheep3 lambs 1 the uterus. The duration of the preparatory stage of childbirth in the Transbaikal sheep averaged 75.8 minutes, while during the first lamb they mostly had one, twins during the second lamb were born from 4 ducks (6.5% of the entire uterine population), during the third lamb from 5 heads (16.6% of the uterine population). The Romanov sheep breed, the duration of the preparatory stage lasted an average of 54.5 minutes. The stage of removing fruit of the Transbaikal fine-wool continued to average 16.9 minutes, Romanov sheep and 12.1 minutes. The intervals between the appearance of the fruit ranged from 3.4 to 27.5 minutes. Milking ewes amounted 165.5 - 178 liters per lactation. The study of the chemical composition of milk of experimental sheep revealed quite high rates of dry matter and fat in milk. The use of hybrids, bighorn sheep when crossed with the Romanov sheep and the TRANS-Baikal fine-wool breeds allows to obtain new genetic combinations of domestic sheep in the conditions of Central Yakutia. For three periods of agneya received 12 argali × the shank × Romanov, 58 Transbaikal fine-wool and 15 zabajkale × Arkhar × Chubuku× Romanov lambs.

reproduction, lambing, sheep of Romanov breed, sheep Transbaikal fine-wool breed, archali×chubuku×romanov sheep

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