SEXUAL DIMORPHISM IN HORSES AND PHYSIOLOGICAL INDICATORS DIFFERENT PERIODS OF THE YEAR

The article presents the materials of research on sexual dimorphism of the horse breed and their physiological indicators for the seasons of the year. That breed was formed as a result of years of work of the qualifying hybrids obtained by crossing local and Turkmen horses. This breed of horses is grown in the southern regions of Turkestan region. The population is dominated by dark brown suit, found in other colors. Height at the withers of karabayir breed stallions made – 147,3 cm, in mares – 144,2 cm; their sexual dimorphism was 2,9 cm; stallions oblique is 150,5 cm; in mares – 146,5 cm, their sexual dimorphism was 4,0 сm. Stallion’s chest circumference accounted 176,8 cm, and mare’s chest circumference – 170,5 cm, their sexual dimorphism was 6,3. Indicator on the joint of the lower leg in stallions was 19,5 cm, in mares – 18,6 cm, their sexual dimorphism was 0,9 cm.
All breeds of horses depending on the year seasons is a change in body temperature, heart rate, breathing rate. It is established that these physiological parameters of horses decrease in winter, and increase in summer. The change in average physiological parameters of Karabayir breed depending on the time of year was: body temperature +0,1 Cº, heart rate +19,0 – +19,3 beats/min, respiration rate +16.0 – +18.1 breath/min.

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