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- W2009557926 abstract "Four experiments were conducted to determine the growing pullet’s response to graded levels of dietary ME (2,650 to 3,150 kcal ME/kg) or CP (15 to 20% CP) when reared in conventional (constant 22 C) or hot-cyclic temperatures (22 to 32 C). Each diet was tested with six replicate groups of eight caged birds from 1 day to 140 days of age. Body weight and feed intake were monitored periodically. Increasing the energy concentration of the diet resulted in increased body weight, with this effect being most pronounced in the hot environment. At 140 days of age, birds fed diets providing 2,650 or 2,750 kcal ME/kg were smaller than birds fed diets providing 2,950 or more kcal ME/kg. Increasing the dietary energy concentration resulted in reduced feed intake and a general tendency to increase energy intake. In other experiments, increasing the dietary protein level had an initial effect of increasing body weights, although by 140 days of age, differential dietary protein levels of 15 to 20% had no effect on body weight. Increasing the protein level of the diet resulted in increased protein intake but had no effect on energy intake. It is concluded that given adequate protein intake, pullet growth is most responsive to energy intake. Pullet growth to 140 days of age will be maximized with cumulative nutrient intakes of 21 Mcal ME and 1,200 g CP. It appears that such intakes can be achieved with mean dietary specifications during rearing of 2,900 kcal ME/kg and 18% CP. However, with multidiet programs, as commonly used in the industry, it appears that pullet growth is initially most sensitive to dietary protein level, whereas energy intake becomes more critical as the bird approaches maturity." @default.
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- W2009557926 date "1989-04-01" @default.
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- W2009557926 title "Response of Leghorn Pullets to Protein and Energy in the Diet when Reared in Regular or Hot-Cyclic Environments" @default.
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- W2009557926 doi "https://doi.org/10.3382/ps.0680546" @default.
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