Variação sazonal na estrutura do pelame e na morfologia da pele de caprinos e ovinos em região semiárida

Abstract

The physical structure of the skin surface of animals are constantly adjusting it in order to provide an optimum combination of skin and fur, which favor the acclimatization in a particular environment. The objective was to evaluate the effects of the change in seasons in low-latitude regions of the hair coat characteristics and morphology of the skin Caninde and Moxotó goats and sheep Morada Nova and Santa Ines. Harvests were made in four periods, the days corresponding to the spring equinox, summer solstice, autumn equinox and the winter solstice. To characterize the hair coat were evaluated the thickness of the outer layer of the hair coat, density, length and diameter of the. To characterize morphology of the skin were measured thickness of the epidermis and dermis sampled area, the area of sweat gland and blood capillaries in the dermis. There was an interaction of factors race and time of year for the thickness of the hair coat, and the diameter of the four breeds studied. The times of the year influenced the thickness of the epidermis, not observing the same effect on the thickness of the dermis. Moxotó showed higher gland area compared to Caninde race. The sweat gland area did not differ in body regions analyzed. The area of sweat glands and capillary varied the evaluated times. The region's side showed greater area of capillary. There is seasonal variation in the morphology of the skin and hair coat structure of goats and sheep raised in low-latitude region. The intensity of the adjustments on the skin surface for different times of the year is similar between Canindé and Moxotó races. The Morada Nova breed is more sensitive to the settings of the skin surface to the variations of the seasons of the year compared to Santa Ines.