Nutritional value of a genetically improved high-lysine, high-oil corn for young pigs.
Two experiments were conducted to compare the nutritional adequacy of a genetically improved high-lysine, high-oil corn (HLHOC; .408% lysine, 6.21% fat, as-fed basis) and a high-oil corn (HOC; .289% lysine, 5.97% fat, as-fed basis) for young growing pigs. Experiment 1 used four non-littermate barrows (initially 20.0 kg BW) fitted with ileal T-cannulas in a crossover-designed digestion study. The .75% total lysine diets contained 8.5% casein and an equal amount of lysine (.25%) from the test corn. Apparent ileal digestibilities of amino acids, GE, DM, and CP were similar (P > .10) between diets. Apparent ileal lysine digestibilities were 65 and 71% for the HOC and HLHOC, respectively, assuming the lysine in casein to be 100% digestible. Experiment 2 used 100 barrows reared in a segregated early-weaning environment (initially 8.3 kg BW and 27 d of age) to evaluate five corn-soybean meal-based diets in a 2 x 2 factorial arrangement with main effects being corn type and dietary lysine (.80 or 1.15% digestible lysine). The fifth diet consisted of the .80% digestible lysine HOC diet supplemented with .23% additional L-lysine x HCl (.975% digestible lysine) to verify that lysine was the limiting amino acid in the low-lysine diets. Increasing digestible lysine from .80 to 1.15% increased (P < .001) ADG and gain/feed (G/F) regardless of corn variety. Combined ADG and G/F were .347 kg and .641 and .443 kg and .790 for the .80 and 1.15% digestible lysine diets, respectively. Within lysine level, corn type did not affect ADG, ADFI, or G/F (P > .10). The results of these studies indicate that the lysine in HLHOC is as available as the lysine in HOC and that HLHOC can be used successfully in swine diets.
O'Quinn
P R
PR
Department of Animal Sciences and Industry, Kansas State University, Manhattan 66506, USA.
Nelssen
J L
JL
Goodband
R D
RD
Knabe
D A
DA
Woodworth
J C
JC
Tokach
M D
MD
Lohrmann
T T
TT
D000821:Animal Feed; D000818:Animals; D003314:Corn Oil / Q000235:genetics; D018592:Cross-Over Studies; D004044:Dietary Proteins; D004063:Digestion; D007082:Ileum / Q000378:metabolism; D008239:Lysine / Q000235:genetics; D008297:Male; D009753:Nutritive Value; D011897:Random Allocation; D013552:Swine / Q000254:growth & development* / Q000378:metabolism; D003313:Zea mays / Q000235:genetics
D004044:Dietary Proteins; D003314:Corn Oil; D008239:Lysine