|Dozier Iii, William|
Submitted to: Southern Poultry Science Society Meeting Abstracts
Publication Type: Proceedings
Publication Acceptance Date: 10/30/2004
Publication Date: 1/15/2005
Citation: Corzo, A., Dozier III, W.A., Blair, M.E., Kidd, M.T. 2005. Broiler responses to a feed enzyme in diets differing in amino acids and energy. Southern Poultry Science Society Meeting. Abstract 192. p. 46.
Technical Abstract: Diets with typical and reduced amino acid and energy levels, with and without a feed enzyme (Rovabio'), were fed to 1,472 Ross x Hubbard broilers (23 male and female chicks/pen randomly allotted to 32 pens) from 1 to 42 d of age. The floor pens contained built-up litter, nipple drinkers, and a tube feeder in a tunnel ventilated house. The combination of two diets with and without the feed enzyme resulted in a 2 x 2 factorial design (8 replications/treatment) implemented in feeds from 1 to 14, 15 to 31, and 32 to 42 d of age. Pen BW gain, feed conversion, and mortality were obtained in all periods. Uniformity was measured by pen at 42 d of age. At 42 d of age, five male and female broilers per pen were randomly selected for processing and subsequent deboned breast meat. The reduced diet resulted in poorer (P < 0.05) BW gain at d 31, but not at d 14 or 42. Corrected feed conversion for the weight of mortality was poorer (P < 0.05) in birds fed reduced diets in all periods. Enzyme treatment did not affect BW gain or corrected feed conversion and differences in uniformity did not occur (average 12.6 coefficient of variation for BW). However, an interaction (P = 0.06) occurred for 14 d mortality indicating that the reduced diet increased mortality without dietary enzyme, but mortality was eliminated in the reduced diet with feed enzyme. Although the reduced diet resulted in more (P < 0.05) abdominal fat, other differences (P < 0.05) in carcass parameters were not observed. Future research will be concerned with further reducing diet density and enzyme responses as the enzyme treatment in the reduced diet resulted in similar responses to the control diet. In conclusion, reducing dietary amino acids and energy resulted in higher corrected feed conversion and abdominal fat, and the deleterious effect of the reduced diet on early mortality was overcome with the feed enzyme.