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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 |
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Abstract |
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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