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Lysine Availability of Roasted Dried and High-Moisture Corns as Determined by the Chick Growth Assay^{1 ,2,}

University of Illinois at Urbana-Champaign, 61801

Abstract

The bioavailability to chicks of lysine in regular and roasted dried corn (10 to 14% moisture) and high-moisture (23%) corn was determined. Three experiments involving 999 8-day-old female chicks from the mating of New Hampshire males to Columbian females were conducted. The dried corns were roasted at temperatures (grain temperature) of 80, 100, 120, 140, 160 and 180 C, and the high-moisture corn at 82, 104 and 127 C.

The lysine availability from the corns, as estimated by the slope-ratio technique, was 72 to 73%. Lysine availability from regular dried corn was adversely affected at roasting temperatures of 150 C or higher as estimated by the least square method. Lysine availability from corns roasted during the drying process was unchanged from the range of temperature treatment up to 104 C. The 127 C temperature treatment reduced lysine availability by 11%.

¹ This research was supported in part by funds from the Illinois Agricultural Experiment Station and from The Andersons (Elevators) Maumee, OH.

² Data are part of the author's thesis presented in fulfillment of the Ph.D. degree, University of Illinois, Urbana-Champaign.

³ Present address: Departamento de Zootecnia, Universidade Federal de Vicosa, 36.570 Vicosa, MG, Brasil.