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Optimum Lactose: Sucrose Ratio for the Pigs Weaned at 21 Days of Age

  • Jin, C.F. (Department of Animal Science and Technology, College of Agriculture and Life Sciences, Seoul National University) ;
  • Kim, J.H. (Department of Animal Science and Technology, College of Agriculture and Life Sciences, Seoul National University) ;
  • Han, In K. (Department of Animal Science and Technology, College of Agriculture and Life Sciences, Seoul National University) ;
  • Yeon, J.U. (Yonam Junior College of Livestock and Horticulture)
  • Received : 1997.03.04
  • Accepted : 1997.08.28
  • Published : 1998.04.01

Abstract

A total of 240 weaned pigs (BW 5.4 kg) were allotted in a completely randomized block design to find out the optimum lactose : sucrose ratio for the weaned pigs. Treatments were 100:0 (A), 75:25 (B), 50:50 (C), 25:75 (D) and 0:100 (E) in lactose : sucrose ratio. For the first week after weaning, average daily gain (ADG) and feed/gain (F/G) were improved (p < 0.05) for pigs fed A, B and C diets compared to pigs fed diets D and E, but the average daily feed intakes (ADFI) of the pigs were not different. From d 7 to 14, no significant differences was found in ADG and ADFI among the treatments, but pigs fed the diets A, B and C had improved F/G compared with the pigs fed diets D and E (p < 0.05). From d 15 to 21, no significant differences were found in ADG, ADFI and F/G among the treatments. The digestibility of nutrients was not influenced by the lactose : sucrose ratio except nitrogen. Nitrogen digestibility of A diet was significantly higher than D and E diets (p < 0.05) but no significant differences were found among diets A, B and C. Dry matter and phosphorus excretions were not influenced by the treatments. The pigs fed diets A, B and C excreted significantly less nitrogen than the pigs fed diets D and E. In conclusion, the results suggest that sucrose can effectively replace up to 50% lactose in starter diets.

Keywords

Pigs;Lactose;Sucrose;Growth

Acknowledgement

Supported by : Ministry of Agriculture, Forestry and Fisheries