title: High-lysine corn as a source of protein and energy for finishing calves.
abstract: Three trials evaluated the protein and energy value of high-lysine corn for finishing calves. In Trial 1, 60 finishing steer calves were used to evaluate corn source (high-lysine vs control) and protein source (urea, blood meal [BM], corn gluten meal [CGM]) and level (BM and CGM addition; low, medium, high). Calves were individually fed using Calan gates for 102 d, and then were pen-fed (two pens per corn treatment) the remaining 83 d. During the initial 102 d, calves fed high-lysine corn had similar gains but were 6% more efficient (P < .10) compared with calves fed control corn. Performance did not differ (P > .10) among sources or levels of protein supplementation. Over the entire feeding period (185 d), calves fed high-lysine corn were 10% more efficient (P < .10) than calves fed control corn. In the second study, in situ starch disappearance was faster (P < .10) and the proportion of CP degraded by 12 h was 27% greater (P < .10) for high-lysine corn than for control corn. In a metabolism trial, five steers fitted with ruminal, duodenal, and ileal cannulas were used in a randomized block design to evaluate the effect of corn source on site and extent of digestion. Intake and ruminal and total tract digestibility of OM and N did not differ (P > .10) between corn sources. Steers fed high-lysine corn tended to have greater ruminal (P = .23) and postruminal (P = .18) starch digestion, resulting in greater (P < .10) total tract starch digestibility.(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Department of Animal Science, University of Nebraska, Lincoln 68583-0908.
authors.forename: S R
authors.initials: SR
authors.lastname: Ladely
authors.forename: R A
authors.initials: RA
authors.lastname: Stock
authors.forename: T J
authors.initials: TJ
authors.lastname: Klopfenstein
authors.forename: M H
authors.initials: MH
authors.lastname: Sindt
mesh_terms: D000596:Amino Acids / Q000032:analysis; D000821:Animal Feed / Q000592:standards; D000818:Animals; D001798:Blood Proteins / Q000592:standards; D002417:Cattle / Q000254:growth & development* / Q000502:physiology; D004044:Dietary Proteins / Q000032:analysis / Q000592:standards*; D004063:Digestion / Q000502:physiology; D004734:Energy Metabolism / Q000502:physiology*; D008239:Lysine / Q000032:analysis* / Q000592:standards; D008297:Male; D009584:Nitrogen / Q000378:metabolism; D011897:Random Allocation; D014508:Urea / Q000592:standards; D003313:Zea mays / Q000737:chemistry / Q000592:standards*
chemical_list: D000596:Amino Acids; D001798:Blood Proteins; D004044:Dietary Proteins; D014508:Urea; D008239:Lysine; D009584:Nitrogen