Influence of dietary net energy content on performance of growing pigs fed low crude protein diets supplemented with crystalline amino acids
XueWu Yi, PhD; ShiRui Zhang, MS; Qiang Yang, MS; HuiHong Yin, MS; ShiYan Qiao, PhD
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Objective: To investigate the effects of dietary net energy (NE) content on the performance of growing pigs fed low-protein diets supplemented with crystalline amino acids.
Materials and methods: A total of 144 barrows (22.96 ± 2.72 kg, Experiment One) or 360 barrows (27.80 ± 3.48 kg, Experiment Two) were assigned to six treatments. Diets in both experiments were based on corn and soybean meal, including an unsupplemented high-crude-protein (CP) diet (19.0% CP, 2.50 Mcal NE per kg) and five low-CP diets (4% lower CP) supplemented with lysine, methionine, threonine, and tryptophan. For Experiment One, five levels of NE (2.64, 2.58, 2.50, 2.42, and 2.36 Mcal per kg) were formulated in the low-protein diets. In Experiment Two, the low-protein diets contained 2.45, 2.40, 2.35, 2.30, and 2.25 Mcal NE per kg.
Results: In Experiment One, for pigs on low-CP diets with different NE levels, ADG (P < .05) and gain:NE intake (kg per Mcal NE) increased linearly with decreasing NE levels (P < .01). In Experiment Two, for pigs on low-CP diets with different NE levels, there was a significant quadratic increase in ADG, gain:feed, and gain:NE intake as net energy levels increased from 2.25 to 2.35 Mcal NE per kg (P < .05).
Implications: Feeding a low-CP, aminoacid-supplemented, corn-soybean-meal-based diet with a proper NE level maximizes the performance of growing pigs. Optimum performance will be obtained if the diet provides approximately 2.40 Mcal NE per kg.
Keywords: net energy, performance, low-protein diet
Cite as: Yi XW, Zhang SR, Yang Q, et al. Influence of dietary net energy content on performance of growing pigs fed low crude protein diets supplemented with crystalline amino acids. J Swine Health Prod 2010;18(6):294-300.
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