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EFFECT OF SUPPLEMENTING RUMEN-PROTECTED LYSINE AND METHIONINE ON RUMINAL CHARACTERISTICS AND NUTRIENT DIGESTIBILITY IN SHEEP

  • Han, In K. (Department of Animal Science and Technology, College of Agriculture and Life Sciences, Seoul National University) ;
  • Ha, J.K. (Department of Animal Science and Technology, College of Agriculture and Life Sciences, Seoul National University) ;
  • Lee, S.S. (Department of Animal Science and Technology, College of Agriculture and Life Sciences, Seoul National University) ;
  • Ko, Y.G. (Department of Animal Science and Technology, College of Agriculture and Life Sciences, Seoul National University) ;
  • Lee, H.S. (Department of Animal Science and Technology, College of Agriculture and Life Sciences, Seoul National University)
  • Received : 1995.06.21
  • Accepted : 1995.11.02
  • Published : 1996.04.01

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 $T_1$ (CP 15% + RPLys 0%), $T_2$ (CP 12% + RPLys 0%), $T_3$ (CP 12% + RPLys 0.4%) and $T_4$ (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 $T_2$, $T_3$ and $T_4$ with the highest value in the $T_4$ 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 $T_1$ (p<0.05) and nitrogen retention rates of groups $T_1$, $T_2$, $T_3$ and $T_4$ 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

Acknowledgement

Supported by : Sewon company, Ltd.