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Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 1996;9(2): 223-230.
DOI: https://doi.org/10.5713/ajas.1996.223    Published online April 1, 1996.
Effect of supplementing rumen-protected lysine and methionine on ruminal characteristics and nutrient digestibility in sheep
In K. Han, J. K. Ha, S. S. Lee, Y. G. Ko, H. S. Lee
This experiment was conducted to investigate the protein sparing effect of rumen protected lysine(RPLys) and methionine hydroxyl analogue(MHA) in sheep. The treatments were T1(CP 15% + RPLys 0%), T2(CP 12% + RPLys 0%), T3(CP 12% + RPLys 0.4%) and T4(CP 12% + RPLys 0.4% + MHA 0.3%). Ruminal characteristics, in situ and in vitro digestibility and nitrogen retention rate were measured in sheep receiving different combinations of dietary supplement. The results are summarized as follows: 1. Ruminal pH and VFA concentrations were not affected by the treatments. Ruminal ammonia-N concentration was high in sheep fed diets T2, T3 and T4 with the highest value in the T4 treatment(p<0.05). 2. The digestibilities of dry matter and organic matter were not affected by the treatments. 3. Nitrogen losses through feces and urine were the highest with T1(p<0.05) and nitrogen retention rates of groups T1, T2, T3 and T4 were 18.6, 32.4, 35.5 and 27.5% of nitrogen intake, respectively, indicating that RPLys supplementation improved nitrogen retention in sheep.
Keywords: Rumen Protected Lysine; Methionine Hydroxy Analogue; Nitrogen Retention; Rumen Fluid Characteristics; Sheep

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