Effect of feed intake on endogenous losses and amino acid and energy digestibility by growing pigs1,2
- 1 December 2004
- journal article
- clinical trial
- Published by Oxford University Press (OUP) in Journal of Animal Science
- Vol. 82 (12), 3518-3525
- https://doi.org/10.2527/2004.82123518x
Abstract
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 × 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.Keywords
This publication has 22 references indexed in Scilit:
- Digestibility of nitrogen and amino acids in soybean meal with added soyhulls1,2Journal of Animal Science, 2004
- The effect of feed intake on ileal rate of passage and apparent amino acid digestibility determined with or without correction factors in pigs.Journal of Animal Science, 2001
- Effects of body weight and feed intake level on basal ileal endogenous losses in growing pigs.Journal of Animal Science, 1999
- Estimation by regression analysis of endogenous amino acid levels in digesta collected from the distal ileum of pigsJournal of Animal Science, 1995
- Amino acid digestibility in soybean meal, extruded soybean and full-fat canola for early-weaned pigsAnimal Feed Science and Technology, 1995
- The effect of food dry matter intake on endogenous ileal amino acid excretion determined under peptide alimentation in the 50 kg liveweight pigJournal of the Science of Food and Agriculture, 1993
- The effects of feed intake and purified cellulose on the endogenous ileal amino acid flow in growing pigsBritish Journal of Nutrition, 1992
- Digestibilities of nitrogen and amino acids in soya-bean, sunflower, meat and rapeseed meals measured with pigs and poultryAnimal Science, 1989
- Effects of Level of Feed Intake on Nitrogen, Amino Acid and Energy Digestibilities Measured at the End of the Small Intestine and over the Total Digestive Tract of Growing PigsJournal of Animal Science, 1984
- AN IMPROVED PROCEDURE FOR THE DETERMINATION OF CHROMIC OXIDE IN FEED AND FECESCanadian Journal of Animal Science, 1979