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Dietary Amino Acid Responses of Mixed-Sex Broiler Chickens From Two to Four Kilograms¹

W. A. Dozier, III^*,2, M. T. Kidd, A. Corzo, J. Anderson and S. L. Branton^*

^* USDA, Agricultural Research Service, Poultry Research Unit, Department of Poultry Science, and Department of Agricultural Economics, Mississippi State University, Mississippi State, MS 39762

Correspondence: ² Corresponding author: bdozier{at}msa-msstate.ars.usda.gov

Two experiments were conducted to assess dietary amino acid density responses on mixed-sex broiler live performance, meat yields, and economics from 36 to 60 d. In experiment 1, broilers were fed a common feeding program to 35 d. Dietary treatments were high (H), moderate (M), and low (L) amino acid density from 36 to 47 d of age and H or L amino acid density from 48 to 60 d of age. Dietary treatments were high-high (HH), high-low (HL), moderate-low (ML), and low-low (LL) during a 60-d production period. In experiment 2, common diets were provided from 1 to 47 d of age. Dietary treatments were H, M, L, and suboptimum (S) amino acid density and fed from 48 to 60 d of age. In experiment 1, increasing dietary amino acid density to HH improved cumulative feed conversion (1 to 60 d) by 4 points over the ML- and LL-fed birds. Broilers provided the HH regimen had 0.6% more total breast meat yield than the LL-fed birds. In experiment 2, broilers fed the H feeding regimen lowered cumulative (1 to 60 d) feed conversion by 3, 5, and 6 points and reduced abdominal fat percentage by 0.28, 0.23, and 0.23%, respectively, compared with the M-, L-, and S-fed birds. Decreasing dietary amino acid density from H to S reduced total breast meat weight and yield by 47 g and 0.82%, respectively. In general, feeding HL (experiment 1) and H (experiment 2) diets increased gross feed margins over the other dietary treatments with diverse diet cost and meat price scenarios.

Key Words: amino acid • broiler • lysine • methionine • nutrient density

¹ Mention of trade names or commercial products in this publication is solely to provide specific information and does not imply recommendation or endorsement by the USDA.

This article has been cited by other articles:

				W. A. Dozier III, M. T. Kidd, and A. Corzo Dietary Amino Acid Responses of Broiler Chickens J. Appl. Poult. Res., January 1, 2008; 17(1): 157 - 167. [Abstract] [Full Text] [PDF]