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RESUMO:Este trabalho foi realizado com objetivo de avaliar o efeito da ambiência interna e externa de galpões de frangos de corte em diferentes fases de criação e épocas do ano. As variáveis ambientais analisadas foram: temperatura e umidade relativa do ar e globo negro (ambiente interno) e temperatura e umidade relativa do ar (ambiente externo). Foram calculados os índices de temperatura e umidade (ITU) e o índice de temperatura de globo negro e umidade (ITGU). A temperatura média apresentou diferenças em relação as diferentes fases de criação nos períodos de alta pluviosidade e de baixa pluviosidade. Em relação à umidade relativa média, a fase de terminação apresentou maior umidade em ambos os períodos. Para (ITU) e (ITGU), no período de alta pluviosidade, a fase inicial apresentou o maior valor médio e, quando comparando períodos, foram encontrados as maiores médias em relação ao período de baixa pluviosidade. Conclui-se que em ambos os períodos as aves foram submetidas a um leve desconforto térmico nas fases de crescimento e terminação. O ambiente externo no período de alta pluviosidade interferiu no ambiente interno dos galpões, aumentando o índice de temperatura e umidade, o qual provocam efeito negativo sobre o conforto térmico das aves.Palavras-chave: conforto térmico, aves, temperatura do ar, umidade relativa do ar.Internal and external environment in cutting chicken shed in different seasons and creation of stages ABSTRACT: This study was conducted to evaluate the effect of internal and external environment of broiler sheds at different stages of creation and seasons. Environmental variables were analyzed: temperature and relative humidity and black globe (indoor) and temperature and relative humidity (external environment). Temperature and humidity indices were calculated (ITU) and the black globe temperature and humidity index (BGT). The average temperature showed differences in the different stages of creation in periods of high rainfall and low rainfall. Regarding the average relative humidity, the finishing phase showed higher moisture in both periods. For (ITU) and (BGT) in the high rainfall period, the initial phase had the highest average value, when comparing periods, were found the highest average for the period of low rainfall. It is concluded that in both periods they were submitted to a mild thermal discomfort in growing and finishing phases. The external environment in the high rainfall period interfered in the internal environment of the sheds, increasing the temperature and humidity index, which cause negative effect on the thermal comfort of the birds.

The aim of this study was to determine the influence of dietary phytase in breeder hens on yolk nutrients, hatchability, chick quality, and growth rate of their progeny, and their subsequent performance to 42 d post-hatch when fed diets with the same phytase concentrations. Breeder hens (n = 216) were divided into 3 groups receiving nutrient-adequate diets with reduced calcium (Ca) and phosphorus (P) (by 0.16% and 0.15%, respectively), supplemented with either 500, 1500, or 4500 FTU/kg phytase from 27 to 50 weeks of age. Eggs were collected at 38 weeks of age and incubated. On the day of hatch, the chick quality and hatchability were determined, and 18 chicks/group were euthanized for yolk sac collection and the determination of inositol and glycerol concentrations. The remaining chicks were divided into three groups, receiving different diets with reduced Ca and P (by 0.16% and 0.15%, respectively), supplemented with 0, 500, or 1500 FTU/kg phytase to 42 d post-hatch. Increasing the phytase concentration in the breeder hen diet linearly (p < 0.05) increased the number of early embryo deaths and decreased the number of late deaths and pips. The inositol concentration in the yolk sac at day of hatch increased (quadratic; p < 0.05) as the phytase dose increased in the breeder hen diet. The breeder hen diet (p < 0.05) influenced the body weight (BW), feed intake (FI), and feed conversion ratio (FCR) up to 21 days of age. The supplementation of breeder hen diets with 1500 FTU/kg phytase increased the concentration of sodium (Na), magnesium (Mg), potassium (K), manganese (Mn), and zinc (Zn) in the yolk sac. The inclusion of phytase doses up to 4500 FTU/kg appeared to influence embryo mortality, chick feed intake, and BW gain to 21 days and the FCR throughout the entire production phase.