| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
ANIMAL NUTRITION |
Department of Animal and Range Sciences, South Dakota State University, Brookings 57006
3 Correspondence: Box 2170, Brookings (phone: 605 688 5434; fax: 605 688 6170; e-mail: hans.stein{at}sdstate.edu).
An experiment was conducted to determine the effect of feed intake (FI) on endogenous losses and the digestibility of CP and AA by growing pigs. Six growing barrows (initial BW = 70.3 kg) had a T-cannula installed in the distal ileum and were used in a 6 x 6 Latin square design. A soybean meal cornstarch-based diet and a N-free diet were formulated. Chromic oxide (0.25%; as-fed basis) was included in both diets as an inert marker. Each diet was provided at three different levels of FI. Feed intake level 1 was equal to the estimated energy requirement for maintenance of the pigs, whereas levels 2 and 3 were two or three times this amount, respectively. Each experimental period lasted 7 d. The initial 4 d of each period comprised an adaptation period to the experimental diets. On d 5, fecal samples were collected, while ileal digesta were collected during two 10-h periods on d 6 and 7. Between each experimental period, a corn-soybean meal-based diet (16% CP) was fed to all pigs for 7 d. The basal ileal endogenous losses (IAAend) of CP and AA were measured for each level of FI from pigs fed the N-free diet. Likewise, the apparent (AID) and standardized (SID) ileal digestibility coefficients for CP and AA in soybean meal were calculated for each level of FI. The total-tract digestibility coefficient of energy in the soybean meal-based diet also was calculated. The AID for CP and all indispensable AA except Lys, Met, and Thr increased (P 
0.055) as FI increased. The IAAend of CP and all AA except Pro decreased linearly (P < 0.05) as FI increased when expressed as g/kg of DMI; however, the total daily IAAend increased as FI increased (linear, P 0.056) for all AA, except for Phe, Thr, Trp, Val, Cys, Gly, and Ser. The AA composition (% of CP) of endogenous protein was not affected by the level of FI, except for Arg, Thr, Pro, and Ser. As FI increased, the SID decreased linearly (P < 0.04) for CP and all AA, except Arg, Trp, Asp, Pro, and Tyr. The total-tract digestibility of energy was not influenced by the FI level. These results demonstrate that the FI level significantly influenced AID, SID, and IAAend for CP and AA. Therefore, pigs used to measure AA digestibility coefficients and IAAend should be fed at a level that is close to what is used under commercial conditions.
Key Words: Amino Acid Digestibility • Endogenous Losses • Feed Intake • Pigs
This article has been cited by other articles:
|
|
 |
|
  F. Ji, D. P. Casper, P. K. Brown, D. A. Spangler, K. D. Haydon, and J. E. Pettigrew Effects of dietary supplementation of an enzyme blend on the ileal and fecal digestibility of nutrients in growing pigs J Anim Sci, July 1, 2008; 86(7): 1533 - 1543. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
H. H. Stein, B. Seve, M. F. Fuller, P. J. Moughan, and C. F. M. de Lange Invited review: Amino acid bioavailability and digestibility in pig feed ingredients: Terminology and application J Anim Sci, January 1, 2007; 85(1): 172 - 180. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
H. H. Stein, C. Pedersen, A. R. Wirt, and R. A. Bohlke Additivity of values for apparent and standardized ileal digestibility of amino acids in mixed diets fed to growing pigs J Anim Sci, October 1, 2005; 83(10): 2387 - 2395. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
