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Performance of Broilers Fed Normal and Waxy Corn Diets Formulated with Chick and Rooster Derived Apparent Metabolizable Energy Values for the Grains

N. E. Collins^*, E. T. Moran, Jr.^* and H. L. Stillborn

^* Poultry Science Department, Auburn University, Alabama 36849
Optimum Quality Grains, L. L. C., Des Moines, Iowa 50322

Correspondence: E. T. Moran, Jr., E-mail: emoran{at}acesag.auburn.edu

An experiment was conducted to compare the feeding value of a normal yellow dent corn (YDC) and its waxy variant (WXC) under practical conditions. Isocaloric and nutritionally equivalent cornsoybean meal diets were formulated to satisfy NRC (1994) requirements by using the actual nutrient profile of each corn hybrid in the ingredient matrix. Starting diet formulation for live performance from 0 to 18 d of age compared AME_n values for the grains that had been measured using chicks at 14 d of age (YDC = 2.79 kcal/g; WXC = 2.86 kcal/g) versus measurements with adult roosters (YDC = 3.27 kcal/g; WXC = 3.23 kcal/g). Subsequent growing and finishing diets from 14 to 42 and 42 to 49 d of age relied exclusively on values for both corns that had been determined with roosters. Inclusion of WXC improved pellet durability and increased overall particulate size of the complete feeds as compared to YDC diets (P 0.05). Broilers fed WXC rations showed greater body weight gains than those on YDC diets, although feed efficiency was generally poorer (P 0.05). Birds provided WXC had an advantage for chilled carcass weight and for meat yield after deboning (P 0.05). Performance and yield differences in response to altering corn hybrid AME_n values for starter diet formulation were negligible. Based upon benefits to pelleted feed characteristics, measures of broiler production, and processing yields, WXC is a favorable ingredient for practical broiler diets.

Key Words: apparent metabolizable energy • broiler • waxy corn • performance

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