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Effects of L-Carnitine on the Nutritive Value of Extruded Full-Fat Soybean in Weaned Pigs

  • Piao, X.S. (Department of Animal Science & Technology, College of Agriculture & Life Sciences Seoul National University) ;
  • Kim, J.H. (Department of Animal Science & Technology, College of Agriculture & Life Sciences Seoul National University) ;
  • Jin, J. (Department of Animal Science & Technology, College of Agriculture & Life Sciences Seoul National University) ;
  • Kim, J.D. (Institute of Animal Science & Technology, Seoul National University) ;
  • Lee, J.H. (Department of Animal Science & Technology, College of Agriculture & Life Sciences Seoul National University) ;
  • Shin, I.S. (American Soybean Association) ;
  • Han, In K. (Department of Animal Science & Technology, College of Agriculture & Life Sciences Seoul National University)
  • Received : 1999.06.08
  • Accepted : 1999.07.30
  • Published : 2000.09.01

Abstract

A total of 80 piglets ($5.85{\pm}0.62kg$ BW; 21 d of age) were used to study the effect of carnitine addition to extruded full-fat soybean (EFS) diets on the growth of weaned pigs. Pigs were allotted into five treatments based on body weight, in a completely randomized block design. Each treatment has 4 replicates of 4 heads each. Treatments were 1) SBM (positive control), 2) EFS without carnitine (negative control), 3) EFS with 50 ppm carnitine, 4) EFS with 100 ppm carnitine and 5) EFS with 150 ppm carnitine. During d 0 to 14, piglets were fed diets containing 3,400 kcal ME, 23% crude protein, 1.65% lysine, 0.9% Ca and 0.8% P and for the period of d 15 to 28, piglets were fed diets supplying 3,300 kcal ME, 20% crude protein, 1.55% lysine, 0.9% Ca and 0.8% P. The urease activity of EFS (0.18) were three times higher than SBM (0.07). During d 0-14, pigs fed SBM had greater ADG and ADFI compared to pigs fed extruded full-fat soybean diets (p<0.05). Feed conversion ratio was not different among treatments. No linear or quadratic effect of carnitine addition was found in growth performance. During d 15-28, piglets fed SBM diet also showed better ADG and FCR with no significant differences among treatments. Feed intake tended to increase as carnitine addition level was increased (p=0.10). For overall period (d o to 28), the best performance was observed in pigs fed SBM diet. CP digestibility was higher in pigs fed SBM diet than piglets fed EFS diet at d 14, and DM and CP digestibility tended to be higher in pigs fed SBM diet at d 28. Blood metabolites (BUN, glucose and cholesterol)were not affected by treatments. In conclusion, based on the results of this study piglets at 21 d of age appeared to be not ready for extruded full-fat soybean (FFSB) in their diets. Piglets fed extruded FFSB showed decreased growth rate compared to piglets fed SBM diet. Nutrient utilization was also poor in piglets fed extruded FFSB diets. L-carnitine addition at the level of 50 to 150 ppm was not effective in improving the growth performance of pigs fed EFS diets.

Keywords

L-Carnitine;Extruded Full Fat Soybean;Growth;Serum;Weaned Pigs

Acknowledgement

Supported by : MAF-SGRP(Ministry of Agriculture and Forestry-Special Grants Research Program)