Effect of Increasing Lysine:net Energy Ratio on Growth Performance and Plasma Urea Nitrogen Concentration of Late-Finishing Barrows Fed Low-Protein Amino Acid-Supplemented Diets and Ractopamine
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چکیده
Low-crude protein, amino acid-supplemented diets containing ractopamine balanced to contain 4.57 to 5.2 g of 1ysinelMcal of net energy can adequately supply amino acids for growth in late finishing pigs. Summary An experiment was conducted to determine the optimum lysine (lys):Net energy (NE) ratio of low-crude protein (CP) amino acid (AA)-supplemented diets needed in cor~jt~nction with racto-pamine (RAC) to improve growth performance of late-finishing barrows fiom the University of Nebraska-Lincoln (UNL) herd. Treatments consisted of jive low CP, AA-supplemented diets with addition of ractopanzine (16% CP; 4.5g/ton), formulated to contain 3.35, 3.95,4.57, 5.2 and 5.83 g of lys/Mcal of NE. A corn-soybean meal diet with no RAC supplernentation served as negative control (20% CP; 5.24 g of Lys/Mcal of NE).Treatnzent did not afect growth performance (P > 0.05). Despite the lack of treatment efect (P = 0.09), increasing dietary lys/NE concentration resulted in a linear decrease in final backfat (P = 0.01). Treatments did not affect final longissirnus rntlscle area (P = 0.69). Results indicate that the optimum lys/NE for late-finishingpigs fiom the UNL herd fed low-CPAA-supplemented diets containing 4.5 g of RAC is between 4.57, and 5.2 g of lys/ Mcal of NE.
منابع مشابه
Effect of Low-Protein Non-Amino Acid Supplemented Diet and Ractopamine (Paylean®) on Growth Performance and Serum Urea Concentration of Late-Finishing Pigs
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