Effect of Dietary Carbadox on Apparent Ileal Digestibility of Amino Acids in Weanling Pigs
L. L. Stewart, B. G. Kim, B. R. Gramm, R. D. Nimmo and H. H. Stein
DOI : 10.3844/ajavsp.2010.168.174
American Journal of Animal and Veterinary Sciences
Volume 5, Issue 3
Problem statement: The objective of this experiment was to determine the effects of carbadox on Apparent Ileal Digestibility (AID) of Amino Acid (AA) by nursery pigs. Approach: Fifteen weanling barrows (initial BW: 9.6 kg) were surgically fitted with a T-cannula in the distal ileum. Animals were randomly allocated to three dietary treatments with five pigs per treatment during a 6- period experiment. Dietary treatments included: (1) a basal diet (BD) containing mainly corn and soybean meal, (2) BD + 27.5 mg kg-1 of carbadox and (3) BD + 55.0 mg kg-1 of carbadox. Treatment diets were provided during period 2-4; the BD was fed to all pigs during period 1, 5 and 6. Ileal samples were collected on d 6 and 7 of each period. Results: In pigs fed only the BD throughout the experiment, the AID of CP and many AA was greater during period 2-4 than during period 1 (p<0.05). This showed that the AID of CP and AA increased during the first few wk of the experiment. This analysis showed that pigs fed the diet containing 55.0 mg kg-1 of carbadox had greater increases (p<0.05) in the AID of CP and most AA from period 1 to period 2-4 than pigs that were fed the diet containing no carbadox. The AID for some AA was less during period 5 and 6 compared with period 2-4 for pigs fed diets supplemented with 27.5 or 55.0 mg kg-1 of carbadox (p<0.05). This observation suggests that there is no carryover effect of carbadox on AA digestibility. Conclusion: Inclusion of carbadox at 55.0 mg kg-1 in diets fed to weanling pigs increased the AID of AA, but carryover effects of dietary carbadox were not observed.
© 2010 L. L. Stewart, B. G. Kim, B. R. Gramm, R. D. Nimmo and H. H. Stein. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.