Amino acid and energy digestibility of protein sources for growing pigs1,2

Abstract

Two experiments were conducted to determine the apparent ileal digestibility (AID) and standardized ileal digestibility (SID) of AA and DE, and to estimate ME and NE of rice protein concentrate, salmon protein hydrolysate, whey protein concentrate, and spray-dried plasma protein. In Exp. 1, 6 barrows (initially 29.5 +/- 2.5 kg of BW) were fitted with ileal T-cannulas and fed each of 5 cornstarch-based diets in a balanced crossover design over 35 d. During a given week, there were either 1 or 2 replications of each treatment, resulting in 6 total replications over 5 wk. The 4 test diets (fed from d 0 to 28) were formulated to contain 12.5% CP by using analyzed nutrient compositions of rice protein concentrate, salmon protein hydrolysate, whey protein concentrate, or spray-dried plasma protein. The fifth (N-free) diet was fed from d 28 to 35 to estimate basal endogenous losses of CP and AA, which were used to calculate SID. Ileal digesta were collected and analyzed, and AID and SID values were calculated. Apparent ileal digestible Lys, Met, and Thr values were 80.0 +/- 3.3, 65.6 +/- 3.1, and 68.4 +/- 4.5% for rice protein concentrate; 85.6 +/- 4.8, 85.5 +/- 4.3, and 69.8 +/- 8.5% for salmon protein hydrolysate; 93.3 +/- 1.4, 89.9 +/- 5.8, and 83.6 +/- 5.3% for whey protein concentrate; and 92.8 +/- 0.9, 85.7 +/- 2.1, 86.5 +/- 2.3% for spray-dried plasma protein, respectively. In Exp. 2, 6 barrows (initially 37.6 +/- 1.7 kg of BW) were fed each of 5 corn-based diets in a balanced crossover design over 35 d. During a given week, there were either 1 or 2 replications of each treatment, resulting in 6 total replications over 5 wk. The 4 diets containing the test ingredients were formulated to contain approximately 20% CP by using their analyzed nutrient compositions. The fifth (corn control) diet containing 8.2% CP was also used to calculate energy values by difference. Feces were collected to determine DE. The ME and NE contents were estimated using published regression equations. The DE, ME, and NE (as-fed) values were 4,724 +/- 461, 4,226 +/- 437, and 3,235 +/- 380 kcal/kg for rice protein concentrate; 4,173 +/- 1,052, 3,523 +/- 1,002, and 2,623 +/- 872 kcal/kg for salmon protein hydrolysate; 4,949 +/- 1,002, 4,352 +/- 955, and 3,344 +/- 831 kcal/kg for whey protein concentrate; and 4,546 +/- 673, 3,979 +/- 652, and 3,020 +/- 567 kcal/kg for spray-dried plasma protein, respectively. The excellent AA digestibility and relatively high DE, ME, and NE values indicate that these protein sources warrant further investigation as ingredients for growing pig diets.

Determination of standardized ileal crude protein and amino acid digestibilities in protein supplements for piglets

“…In the present study, the CP concentration in FM1 and FM2 e was 779 and 851 g/kg DM (Table 1), respectively; however, the total amount of AA (except for Tyr) was below the corresponding CP concentration amounting to 678 and 745 g/kg DM in FM1 and FM2 e , respectively. Therefore, the CP content in FM1 and FM2 e may have been overestimated in the present study due to a great proportion of non-protein-N compounds in fish meals (Gottlob et al, 2006).…”

“…Both fish meal products like other rendered animal by-products (Gottlob et al, 2006) have greater crude ash contents than plant feed ingredients (Table 1). In the present study, the CP concentration in FM1 and FM2 e was 779 and 851 g/kg DM (Table 1), respectively; however, the total amount of AA (except for Tyr) was below the corresponding CP concentration amounting to 678 and 745 g/kg DM in FM1 and FM2 e , respectively.…”

Evaluation of Energy Digestibility and Prediction of Digestible and Metabolisable Energy in Sunflower Seed Meal Fed to Growing Pigs

“…The DE and ME in the basal diet was then divided by 0.97 to calculate the DE and ME in the energy-contributing ingredient according to Gottlob et al (2006). The DE and ME values provided by each sample were calculated by subtracting the DE and ME values provided by the basal energy-contributing ingredients (Adeola, 2001).…”

Apparent and standardized ileal digestibility of amino acids in yeast extract and spray dried plasma protein by weanling pigs

“…However, apparent (AID) and standardized (SID) ileal digestibility values for CP and AA in yeast extract have not been reported. Digestibility values for AA in SDPP have been reported on a few occasions (Cho et al 1997;Chae et al 1999;Gottlob et al 2006), but these values were measured in growing pigs, and it is not known if they are also representative of values for AID and SID in weanling pigs. It was, Urbana IL, 61801 (phone: 217-333-0013; fax: 217-333-7088; email: hstein@uiuc.edu …”

“…However, apparent (AID) and standardized (SID) ileal digestibility values for CP and AA in yeast extract have not been reported. Digestibility values for AA in SDPP have been reported on a few occasions (Cho et al 1997;Chae et al 1999;Gottlob et al 2006), but these values were measured in growing pigs, and it is not known if they are also representative of values for AID and SID in weanling pigs. It was, Abbreviations: AA, amino acids; AID, apparent ileal digestibility; CP, crude protein; SDPP, spray dried protein plasma; SID, standardized ileal digestibility therefore, the objective of this experiment to measure AID and SID for CP and AA in yeast extract and SDPP fed to weanling pigs.…”