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oai:www.ideals.illinois.edu:2142/83653 2023-07-11 col_2142_5131 col_2142_14771 com_2142_5130 com_2142_685 com_2142_397

Baker, David H. Edwards, Hardy Malcolm, III 2015-09-25T21:08:38Z 2015-09-25T21:08:38Z 10000-01-01 1999 1999 Broiler chicks were fed chemically defined crystalline amino acid diets containing graded levels of either L-threonine (Thr), L-lysine·HCl (Lys), DL-methionine (Met), or L-cystine (Cys) during the period 10 to 20-d posthatching. At least six doses of the limiting amino acid representing from 5 to 95% of its ideal level for maximal weight gain and feed efficiency were included as treatments. Other amino acids were maintained at minimized excess levels that were 15% (of ideal) above the various doses of the limiting amino acid. Following 10 d of feeding and a 24-h fast, chicks were killed for whole-body protein and amino acid analysis. Using pen accretion means, protein accretion and accretion of the limiting amino acid were linear functions of intake of the limiting amino acid from 5 to 95% of ideal for Thr and Lys and from 5 to 70% of ideal for Met and sulfur amino acids (SAA). Slope of the limiting amino acid accretion line indicated 82% of Thr was recovered in whole-body protein, 79% of Lys, 68% of Met, and when calculated together 52% of SAA. Maintenance requirements for zero accretion of the limiting amino acids were, as follows: Thr, 45.7 mg/d per kg0.75; Lys, 89.1 mg/d per kg 0.75; and SAA, 15.3 mg/d per kg0.75. Maintenance requirements for zero protein accretion of the limiting amino acids were all lower: Thr, 39.2 mg/d per kg0.75; Lys, 6.9 mg/d per kg 0.75; and SAA, 9.4 mg/d per kg0.75. As doses of the limiting amino acid increased in the diet, whole-body concentrations of other indispensable amino acids increased whereas glycine and proline tended to decrease. Protein quality evaluation of soybean meal (62.7% CP) processed from a genetically modified high protein soybean revealed an increase in all essential amino acids, and amino acid digestibility values were comparable to a soybean meal (47.5% CP) processed from a conventional soybean variety. Results of this study indicated that the high protein soybean meal has considerable advantages over conventional soybean meal as a feed ingredient for broiler chickens. Made available in DSpace on 2015-09-25T21:08:38Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 9944842.pdf: 4040661 bytes, checksum: 7d8b0d5fcd894114cea372205e3098cd (MD5) Previous issue date: 1999 Embargo set by: Seth Robbins for item 84934 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 99 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1999. http://hdl.handle.net/2142/83653 (MiAaPQ)AAI9944842 eng Biology, Animal Physiology Maintenance Requirements and Efficiency of Utilization of Protein, Threonine, Lysine and Sulfur Amino Acids in Chicks Fed Diets Based on Crystalline Amino Acids or Soybean Meal text Animal Sciences Animal Sciences University of Illinois at Urbana-Champaign Dissertation Ph.D.