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Growth Promotion in Broilers by Copolymer CRL87-61

Poultry Science Department, P. O. Box 5188, Mississippi State University, Mississippi State, MS 39762; Phone: (601) 325-3377;FAX: (601) 325-8292

P. H. Culbreth

CytRx Corporation, 150 Technology Parkway, Norcross, GA 30092; Phone: (404) 368-9500; FAX: (404) 368-0622

Correspondence: J. P. Thaxton

CRL87-61 is one of a series of nonionic block copolymers which are being developed for use in human and animal medicine. Recent studies have suggested that this compound holds potential as a growth promoter in broiler chickens. Our report details results of further investigation of the efficacy of copolymer CRL87-61 as a growth promoter in broilers. The study consisted of independent field trials in Colorado, Maryland and Mississippi. Results confirmed that CRL87-61 is a growth promoter in broilers: a dietary level of 10 ppm caused an average increase of 2.85% in 42 day body weights, an average improvement of 1.66% in feed conversion, and an average decrease of 0.31% in mortality rate when compared to untreated (control) birds. Improved production parameters were also noted when birds fed 10 ppm of CRL87-61 were compared to broilers that received Bacitracin only.

Key Words: Copolymers • broilers • growth promoters