Influência da dieta com diferentes níveis de lipídeo e proteína na resposta fisiológica e hematológica de reprodutores caprinos sob estresse térmico

Abstract

This work was developed in the Center of Health and Rural Technology at Federal University of Campina Grande - Campus of Patos-PB. The objective was to test the diets with different lipid and protein levels in the highest temperature of the year (November to December) on the physiological and hematological parameters of the buck goats kept under thermal stress. A total of 27 buck goats crossbred of the Anglo-Nubiano with buck goat without defined bred were used. The buck were allocated into a completely randomized design in a 3 x 3 x 2 factorial scheme, three lipids levels (2, 4 and 6%), three protein levels (12, 15 and 18%) and two periods (morning and afternoon) with three repetitions. The buck goats were fed with balanced diets based on: corn crumbs, wheat and soybean meal , hay of Tifton (Cynodon spp.), it mixes mineral and and sunflower oil as a lipid source. The meteorological data were done twice a day at the 9:00 am and 15:00 pm. The physiological parameters rectal temperature (TR), respiratory frequency (FR) and surface temperature (TS) were checked two days a week in the two periods at 9:00am and 15:00 pm. A sample of blood was collected, for the erythrogram analysis. The temperatures ranged from 37,21 ºC to 25,25 ºC . The values of the black globe and humidity index temperature (BGHI) for the shifts of the morning and afternoon were of 80,16 and 87,17, respectively. There was no effect (P>0,05) of the diets on the parameters TR and FR. In relation to the periods also shown no significant effect (P <0,05) on the TR and FR. The data shown a significant interaction (P<0,05), for the diet with 15% of protein and 2% of lipid on the periods studied.. The variance analysis did not show any significantive effect (P>0,05) of the diets on the blood parameters, hematócrit (HT), erythrocyte (ER), hemoglobin (HB), hemoglobin medium corpuscular (CHCM) and medium globular volume (VGM). The different protein levels and lipid in the diet did not show any effect on the physiologic and hematological parameters on the buck goats reared under thermal stress tested.