Threonine requirement of the grower Turkey tom
Barbour G.W. | Farran M.T. | Lilburn M.S. | Barbour, G.W., Agriculture Research Institute, Tel Amara, Beqa'a, Lebanon, Lebanese Agricultural Research Institute, P.O. Box 287, Zahle'-Tel Amara, Beqa'a, Lebanon | Farran, M.T., American University of Beirut, Faculty of Agricultural and Food Sciences, Beirut, Lebanon | Lilburn, M.S., Ohio State University, Ohio Agricultural Research and Development Center, Animal Sciences Department, Wooster, OH 44691, United States | Barbour, G. W.; Lebanese Agricultural Research Institute, P.O. Box 287, Zahle'-Tel Amara, Beqa'a, Lebanon; email: [email protected] | University: American University of Beirut; Faculty: Faculty of Agricultural and Food Sciences; Department: FAFS; | FAFS | [email protected] | Faculty of Agricultural and Food Sciences | Barbour, GW | Farran, MT | Lilburn, MS | Barbour, GW (reprint author), Lebanese Agr Res Inst, POB 287, Zahle Tel Amara, Beqaa, Lebanon. | American University of Beirut
Two experiments were conducted to determine threonine requirement for maximum performance and breast and drumstick major muscle relative weights of turkey toms raised from 8-10 wk and 11-13 wk of age. Also plasma free amino acid concentration in response to feeding a diet with graded levels of threonine was measured. A corn-peanut meal diet was formulated to contain 0.59, 0.72, 0.85, 0.98 and 1.11percent threonine and fed to Large White turkey males (British United Turkeys, BUT) in both trials. Each treatment was replicated among 5 and 8 individual cages in experiments 1 and 2, respectively. Two days prior to the end of each trial, blood was removed from the brachial vein of five toms per treatment and analyzed for plasma amino acid concentration. At the end of each experiment, final body weight and feed consumption were recorded and feed efficiency was computed. Birds were then sacrificed and pectoralis major and gastrocnemius muscles were weighed. The 0.85percent dietary threonine resulted in the highest weight gain and feed efficiency ratio in the first trial. In the second experiment an increase (P 0.05) in weight gain was also obtained by the 0.85percent dietary threonine with no further significant improvement beyond that level. Therefore the current results indicate that the threonine requirement for maximum weight gain of turkey toms raised from 8 to 10 and 11 to 13 wk of age is 0.85percent. The changes in blood threonine concentration further supported the estimated requirement of threonine obtained from the performance data. Increasing dietary threonine from 0.59 to 1.11percent during both growing periods, however, had no effect on pectoralis major or gastrocnemius muscles yield. In conclusion threonine requirement for maximum performance of the grower turkey torn raised from 8 to 13 wk of age was 0.85percent diet, a value slightly higher than that reported in the literature. Copyright © 2008, Japan Poultry Science Association.
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