Effects of Standardized Ileal Digestible Lysine Level on Growth Performance of 80 to 120 lb DNA Grow-Finish Pigs

Abstract This study aimed to estimate the net energy value of expelled, extruded soybean meal (MSBM) relative to dehulled, solvent-extracted soybean meal (SBM) and determine its effects on growth performance of late nursery pigs. Analyzed values for CP, EE, CF, and lysine for the SBM were 47.28%, 0.47%, 3.80%, and 3.00% while the MSBM contained 47.41%, 6.88%, 5.32%, 2.99% respectively. A total of 297 pigs (DNA 200 x 400) were placed into 60 pens (2 rooms of 30 pens) with 5 pigs per pen balanced by gender and weaning weight. Pigs were fed common diets for 21 days. Then, pens of pigs (BW 9.3 kg) were randomly assigned to one of five treatments to provide 12 replications per treatment. Treatments consisted of increasing amounts of MSBM replacing SBM in the diet (0, 25, 50, 75, 100%). All diets were fed for 28 days and were formulated to 1.30% standardized ileal digestible lysine and met or exceeded NRC (2012) recommendations for lysine:amino acids, calcium, and phosphorus. The SBM diet was formulated to 2421 kcal/kg and net energy (NE) was not balanced between diets. Data were analyzed using Proc GLIMMIX (SAS 9.4; Cary, NC) with pen as the experimental unit and room as the blocking factor. There was no evidence of differences in ADG and ADFI in pigs fed diets with increasing concentrations of MSBM. Pigs fed diets with increasing concentrations of MSBM had improved (linear, P < 0.001) G:F and caloric efficiency on an NE basis. In conclusion, using caloric efficiency to estimate NE of the MSBM relative to SBM, MSBM was estimated to have a value of 123% of SBM NE or 2566 kcal/kg. This increase in NE resulted in improved feed efficiency of nursery pigs.

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PSIX-30 Effects of dietary lysine restriction on plasma amino acid profile and growth performance of growing pigs

Journal of Animal Science ◽

10.1093/jas/skz258.683 ◽

2019 ◽

Vol 97 (Supplement_3) ◽

pp. 342-343

Author(s):

Shamimul Hasan ◽

Rebecca Humphrey ◽

Shengfa F Liao

Keyword(s):

Growth Performance ◽

Muscle Growth ◽

Amino Acid Profile ◽

Blood Stream ◽

Growing Pigs ◽

Deficient Diet ◽

Student’S T ◽

Dietary Treatments ◽

Standardized Ileal Digestible Lysine ◽

Student’S T Test

Abstract Muscle growth requires a constant supply of free amino acids (AAs) from blood stream. Thus, a balanced blood plasma AA profile is critical for optimizing the growth performance of pigs. This research was conducted to study how dietary lysine restriction affects the plasma AA profile in growing pigs. Twelve crossbred young barrows (initial BW 22.6 ± 2.04 kg) were individually penned in an environment controlled barn. Pigs were assigned to one of the two dietary treatments according to a completely randomized experiment design (n = 6). Two corn- and soybean meal-based diets containing 0.65% (Diet I, lysine-deficient) and 0.98% (Diet II, lysine-adequate) standardized ileal digestible lysine were fed to the pigs. The growth performance of pigs with parameters including ADG, ADFI, and G:F was measured for the 8 week feeding trial. At the end of the trial, jugular vein blood was collected and the plasma samples were obtained for AA analysis using HPLC methods. Data were statistically analyzed using Student’s t-test. As expected, the ADG of Diet I pigs was lower (P < 0.01) than Diet II pigs, and so was G:F (P < 0.05) since there was no difference in ADFI between the two groups. In terms of plasma free AAs, the concentrations of lysine, methionine, leucine, and tyrosine were lower (P < 0.05), while the concentration of b-alanine was higher (P < 0.01), in Diet I vs. Diet II pigs. The concentrations of other AAs were not different (P > 0.05) between the two groups. It can be concluded that besides lysine, the reduced plasma supply of methionine, leucine, and tyrosine is all responsible for the reduced ADG and G:F in pigs fed the lysine-deficient diet. Whether or not the increased plasma concentration of b-alanine in lysine-deficient pigs can reduce the occurrence of PSE pork warrants further investigation.

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