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Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 1996;9(3): 309-313.
DOI: https://doi.org/10.5713/ajas.1996.309    Published online June 1, 1996.
Effect of supplementing rumen-protected lysine on growth performance and plasma amino acid concentrations in sheep
In K. Han, J. K. Ha, S. S. Lee, Y. G. Ko, H. S. Lee
This experiment was carried out to investigate the effect of rumen-protected lysine(RPLys) on growth rate, feed efficiency and plasma amino acid concentrations in sheep. RPLys was supplemented at the level of 0%(T1), 0.2%(T2) and 0.4%(T3) of total DMI with 24 sheep in a 56 day feeding trial. The results are summarized as follows: 1. live weight gain of sheep in groups T1, T2 and T3 was 219, 216 and 244 g/d, and was significantly(p<0.05) higher for T3 through the entire experiment. 2. Feed intake was not affected by RPLys supplementation. 3. The group fed T3 had a significantly(p<0.05) better feed efficiency than the groups fed T1 and T3. The response of T3 was higher in growing period II of feeding low protein basal diet than in period I. 4. Plasma lysine concentrations tended to be higher with supplementing RPLys, but there were no differences between T2 and T3. 5. Supplementing RPLys in the diets increased plasma concentrations of arginine, asparagines, threonine, serine, valine and leucine compared with sheep receiving no RPLys. In contrast, plasma histidine was lower in sheep fed the supplementing RPLys than fed the diet T1 with significant(p<0.05) difference.
Keywords: Rumen Protected Lysine; Live Weight; Feed Efficiency; Plasma Amino Acids; Sheep

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