Qualidade seminal de ovinos das raças Santa Inês e Dorper em diferentes condições ambientais.

Abstract

The experiment was conducted in Umari Farm, located in the city of Caturité, PB, located in the micro Cariri East of Paraíba, The aim of this study was to evaluate the bioclimatic indexes of facilities, and physiological indices and quality of sheep seminal Santa Inês and Dorper, kept in environments totally exposed to sun and shade. Physiological indices were checked rectal temperature (RT), respiratory rate (RR) and heart rate (HR), surface temperature (TS) and tests were performed andrological the ejaculate Sheep, assessing volume, turbulence, motility, vigor, concentration, and acrosome integrity and hypoosmotic test. We used 20 male sheep of Santa Inês and Dorper, ten animals of each breed, with an average age of 24 months. We used a completely randomized split plot, with main treatment consisting of the races and the secondary treatment the environments. The maximum air temperature, relative humidity maximum and the ITGU maximum in both environments, were greater than thermal comfort zone, above 30 oC, 70% and 85.1, respectively. At 8 am and 17 pm the animals Santa Ines kept in the shade had lower TR values, compared to the Dorper breed animals, showing the greater ability to dissipate heat. For FR Santa Inês sheep showed lower values than the Dorper at 8 am 14 pm and 17 pm, only statistical difference at 8 am. For FC, the animals of the Santa Inês shaded environment showed lower values than animals of all the others treatments. For TS, the shading had influence in reducing this temperature, because the animals showed the lower shaded, regardless of race, values were lower about 4 to 6 oC. The semen of animals kept shaded showed better quality, and the values for turbulence, vigor, motility, concentration and volume were higher, and acrosome integrity and membrane HOST, regardless of breed. The surface temperatures of the testes remained 2 to 6 oC below the body temperature of the animals. The shading was not able to promote optimal conditions for keeping animals in the thermal comfort zone.