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Effects of Isoleucine Supplementation of a Low Protein, Corn-Soybean Meal Diet on the Performance and Immune Function of Weanling Pigs

  • Zheng, C.T. (Ministry of Agriculture Feed Industry Center, China Agricultural University) ;
  • Li, D.F. (Ministry of Agriculture Feed Industry Center, China Agricultural University) ;
  • Qiao, S.Y. (Ministry of Agriculture Feed Industry Center, China Agricultural University) ;
  • Gong, L.M. (Ministry of Agriculture Feed Industry Center, China Agricultural University) ;
  • Zhang, D.F. (Ministry of Agriculture Feed Industry Center, China Agricultural University) ;
  • Thacker, P. (Department of Animal Science, University of Saskatchewan) ;
  • Han, In K. (Department of Animal Science & Technology, Seoul National University)
  • Received : 2000.03.08
  • Accepted : 2000.05.16
  • Published : 2001.01.01

Abstract

This experiment was conducted to investigate the effects of crystalline isoleucine supplementation of a low protein, corn-soybean meal diet on the performance and immune function of weanling pigs. Forty-five crossbred ($Duroc{\times}Landrace{\times}Large\;White$) piglets, weighing an average of $11.00{\pm}0.07kg$, were assigned to either a control diet containing 20% crude protein (0.64% isoleucine), a 16% crude protein diet without isoleucine supplementation (0.41% isoleucine) or a 16% crude protein diet supplemented with isoleucine (0.64% isoleucine). Reducing the crude protein content of the diet from 20 to 16% significantly (p<0.05) reduced both average daily gain and feed intake. Feed conversion also tended (p=0.07) to be poorer for a low protein diet without isoleucine supplementation. Isoleucine supplementation of the 16% crude protein diet increased both gain and feed intake to a level similar to that obtained by pigs fed the 20% crude protein diet (p>0.05). Blood urea nitrogen, serum total protein and serum globulin were significantly (p<0.05) higher for pigs fed the unsupplemented 16% crude protein diet than for pigs fed the isoleucine-supplemented diet or the control. Egg albumin antibody titre decreased significantly (p<0.05) in pigs fed the diet with isoleucine supplementation, whereas the antibody titre of pigs fed the low protein and low isoleucine diet was similar to that of pigs fed the diet containing 20% crude protein and 0.64% isoleucine. It was suggested that crystalline isoleucine supplementation of a low protein and low isoleucine diet improved pig performance but suppressed humoral immune function.

Keywords

Isoleucine;Pig;Performance;Immune Function;Protein Deficiency

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  1. Effects of feeding low protein diets to piglets on plasma urea nitrogen, faecal ammonia nitrogen, the incidence of diarrhoea and performance after weaning vol.62, pp.5, 2008, https://doi.org/10.1080/17450390802327811
  2. vol.50, pp.9, 2010, https://doi.org/10.1071/AN10058
  3. Effects of Replacing Corn with Rice or Brown Rice on Laying Performance, Egg Quality, and Apparent Fecal Digestibility of Nutrient in Hy-Line Brown Laying Hens vol.43, pp.2, 2016, https://doi.org/10.5536/KJPS.2016.43.2.97