Efeito dos diferentes níveis de energia e proteína sobre parâmetros fisiológicos de frangos de corte.

Abstract

Effect of different levels of energy and protein on physiological parameters of broilers. One of the biggest challenges for the production of broilers in Brazil are environmental factors and their influence on productivity. It is necessary to provide the animals with an environment and adequate nutrition, so they present their actual genetic and livestock potential. As an alternative to avoid thermal discomfort comes to manipulation of protein and energy diets. Therefore, the objective of this study was to evaluate different levels of energy and protein on physiological parameters and thermal gradients of broilers in the semi-arid Paraiba. In the study they were used 450 broiler chickens one day of life, created during three phases of creation: early (07-21 days), growth (22-35 days), late (36-42 days). The birds were distributed in a completely randomized design with a 3x3 factorial arrangement, with three power levels and tees protein levels: 2950, 3000, 3050kcal / MS and 19.8, 20.8 and 21.8% CP in phase initial; 3050, 3100, 3150 kcal / MS and 18.5, 19.5 and 20.5% CP in the growth phase and; 3100, 3150, 3200 17, 18 and 19% CP in the final phase, a total of nine experimental plots with five replications and ten animals per plot. Environmental data air temperature (AT), relative humidity (RH), temperature of the black globe (TBG) and dew point temperature (DPT) were obtained at 09:00 and 15:00 for the morning shift and hours respectively. The physiological parameters were obtained at the same times of environmental data. In the initial phase, there was a significant effect (P <0.05) for respiratory rate between energy levels, 3000 and 3050 being the highest average observed for the level of 3000, there was also a difference between morning and afternoon shifts to surface temperature, with the highest average in the afternoon, and thermal gradients with higher averages for the morning shift. In the growth phase was no difference between shifts for breathing rate and skin temperature, and the highest average for the afternoon shift and thermal gradient TCTS with the highest average in the morning shift. In the final phase for RF, was no effect (P <0.05) energy levels, with the highest average observed for 3100 levels and 3150 Kcal / Kg of MS also TCTS TSTA and thermal gradients showed differences with larger averages found in the morning shift and surface temperature (TS) with the highest average found in the afternoon. It is recommended for the initial phase 2,900 kcal ME / kg of metabolizable energy and 19.8% crude protein. For growing 2950 kcal / kg ME and 18.5% CP. In the final phase 3200 kcal / kg ME and 19% CP.