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 《Amino Science》Vol.1 Feb. 2008
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| Bioefficacy of L-lysine•H2SO4 relative to L-lysine•HCl in broiler chickens, estimated by slope-ratio model |
| 作者（Author）：Z.R. Wang J.M. You S.Y. Qiao X. Wang |
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摘要（Abstract）：
1. A broiler experiment was conducted to assess the effectiveness of L-lysine•H2SO4 relative to L-lysine•HCl. Four concentrations of L-lysine•H2SO4 and L-lysine•HCl (0•9, 1•8, 2•7 and 3•6 g/kg diet) were each added to a basal diet that met the nutrient requirements of broilers except for lysine.
2. Birds responded significantly to the supplements in daily gain, feed intake, feed conversion efficiency, nitrogen retention and plasma urea nitrogen during each period (d 4 to 21, d 22 to 42 and d 4 to 42).
3. Regression analysis showed that the bioefficacy of L-lysine•H2SO4 relative to L-lysine•HCl was 0•93, 0•86 and 0•95 for daily gain, feed conversion efficiency and nitrogen retention, respectively, during the starter period (d 4 to 21), and was 1•01, 1•36 and 1•06, respectively, during the grower period (d 22 to 42). It was 0•99, 1•07 and 1•03, respectively, for the overall period (d 4 to 42), when the bioefficacy of L-lysine•HCl was set at 1•0.
4. The bioefficacy of L-lysine•H2SO4 differed with different response criteria. The average bioavailability of L-lysine•H2SO4 relative to L-lysine•HCl was 1•03 on an equimolar basis in the present study. In conclusion, L-lysine•H2SO4 and L-lysine•HCl are equally efficacious to broiler chickens.
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| Bioefficacy of Lysine from L-Lysine Sulfate and L-Lysine•HCl for 10 to 20 kg Pigs |
| 作者（Author）：M. Liu a S. Y. Qiao X. Wang J. M. You and X. S. Piao |
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摘要（Abstract）：
The objective of this study was to compare the bioefficacy of L-lysine sulfate relative to L-lysine•HCl for 10 to 20 kg pigs. Two experiments were conducted to determine the bioefficacy of the two sources of lysine using daily gain, feed conversion, plasma urea nitrogen, and nitrogen retention as the response criteria. In experiment 1, 168 crossbred barrows (Landrace×Large White), weaned at 28±3 d (9.07±0.78 kg body weight), were allotted to one of seven dietary treatments in a 2×3 (two lysine sources×three lysine levels) factorial arrangement of treatments with an added negative control treatment group experiment. The basal diet was based on corn, peanut meal and soybean meal and provided 0.67% lysine. The basal diet was supplemented with 0.1, 0.2 or 0.3% lysine equivalents supplied from either L-lysine sulfate or L-lysine•HCl. Each treatment was fed to six pens of pigs with four pigs per pen. The trial lasted 21 days. The relative bioefficacy value of lysine in L-lysine sulfate using daily gain, feed conversion and plasma urea nitrogen as response criteria was 1.01, 1.05 and 1.04 of the lysine in L-lysine•HCl, respectively. In experiment 2, 42 crossbred (Landrace×Large White) pigs (16.03±1.58 kg body weight) were housed in stainless metabolism cages for 10 d and fed the seven diets used in the nitrogen-balance trial. The relative bioefficacy value of L-lysine sulfate was estimated to be 0.95 as effective as L-lysine•HCl for nitrogen retention on an equimolar basis. The t-test analysis revealed that bioefficacy of lysine in L-lysine sulfate was not significantly different from lysine in L-lysine•HCl, which was set at 1.00. In conclusion, L-lysine sulfate can be used instead of L-lysine •HCl to fortify lysine-deficient diets fed to 10 to 20 kg pigs.
Key Words : Pigs, L-Lysine Sulfate, L-Lysine•HCl, Bioefficacy, Nitrogen Retention, Performance)
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Effect of 65% L-lysine Sulfate on digestibility and available energy in pigs and poultry
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| 作者（Author）： Z.R. WANG M. LIU X. WANG Q.LIU |
摘要（Abstract）：
3 experiments have been conducted in this research aiming at evaluating the digestibility and available energy content of lysine in L-lysine Sulfate in laying hens, broilers and growing pigs. Data from all 3 experiments indicated a high digestibility of 65% lysine sulfate in poultry and true ME of 3831 kcal/kg in adult laying hens. No significant difference of endogenous N loss has been found between casein and fasting treatments. Lysine digestibility in lysine sulfate and lysineHCl were approximately the same. Lysine ileal true digestibility in pigs could reach 98.88%. All these data provided a good reference to make a reasonable formula using L-lysine sulfate in practice.
Keywords: Poultry, Pigs, L-lysine sulfate, Lysine digestibility, metabolic energy
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