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Broiler Yields Using Chicks from Extremes in Breeder Age and Dietary Propionateš

Department of Poultry Science and Alabama Agricultural Experiment Station, Auburn University, AL 36849-5416; Phone: (334) 844-2617; FAX: (334) 844-2641

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

Chicks originating from 27- and 62-wk-old breeder flocks were evaluated beyond live performance to carcass characteristics. One half of each source and sex received 3% ammonium propionate in the first week's feed; thereafter, a common regimen was given to 7 wk of age. Birds from the older breeders showed superior live gain and survival, but birds from younger breeders had better feed conversion. Supplemental propionate decreased live gain wile it was being fed but improved ultimate feed conversion for all birds and survival in birds from the young breeder flock. Proportion of abdominal fat was similar, regardless of breeder age and supplemental propionate; however, additional carcass yield with broilers from the old breeders provided further advantage in chilled weight. Few differences in carcass defects associated with downgrading were detected. Proportions of cone deboned parts were similar among treatments.

Key Words: Breeder age • broiler breeder • carcass yield • propionate

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