Abstract
The considers the research results of productive qualities and biological features of Tyvan short-fat tailed sheep breed depending on the season of the year and the breeding zone of the Republic of Tyva: mountain taiga-steppe, desert-steppe and dry steppe. The highest live weight was observed in sheep raised in the dry steppe zone. When studying the biochemical composition of the blood of sheep in the summer-autumn grazing period, the content in the blood of sheep of the compared groups of basic biochemical parameters is within the physiological norms. In the winter-spring period, when grazing sheep on rags of last year’s grass due to a deficiency in their diets of basic nutrients, the blood levels of animals of all groups of total protein, calcium and reserve alkalinity are below physiological norms.
Highlights
For year-round pasture grazing in various natural and climatic zones of the Republic of Tyva, the main fodder for sheep is herbs of natural fodder land [1-6]
We have studied the adaptive properties of the Tyvan short-fat tailed sheep breed at year-round pasture grazing in MUE “Head Farm Torgalyg” in Ovyursky, MUE “Stud Farm Despen” in Tes-Khemsky and AC “Stud Farm Kyzylsky” in Kyzylsky cozhuuns, located respectively in Tannuol mountain taiga-steppe, Southern desert-steppe and Central Tyva dry-steppe zones of the Republic of Tyva
The largest live weight is noted in Tyvan short-fat tail breed sheep bred in the dry steppe and the smallest - in the mountainous taiga-steppe zone
Summary
For year-round pasture grazing in various natural and climatic zones of the Republic of Tyva, the main fodder for sheep is herbs of natural fodder land [1-6]. The most critical in the provision of animal feed is winter and early spring months, when the grass stand of pastures is represented by the herbs of last year's grass with insufficient content of nutrients required for their organisms. As a result, they have significant loss of live weight, which is restored during the brazing period on the green, succulent grass of summer-autumn pastures. In the practice of sheep husbandry, the adaptive capabilities of animals to year-round pasture grazing are judged on their ability to recover winter losses of live weight in grazing on the nutrient-enriched grass stand of summer pastures [7-9]. The following tasks were solved: - determine the change in the live weight of sheep depending on the breeding area and season of the year - study biochemical indicators of sheep blood depending on the breeding zone and season of the year
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