EFFECTS OF DIETARY THREONINE IN STARTING, GROWING, AND FINISHING TURKEY TOMS

Citation
D. Lehmann et al., EFFECTS OF DIETARY THREONINE IN STARTING, GROWING, AND FINISHING TURKEY TOMS, Poultry science, 76(5), 1997, pp. 696-702
Citations number
33
Categorie Soggetti
Agriculture Dairy & AnumalScience
Journal title
ISSN journal
00325791
Volume
76
Issue
5
Year of publication
1997
Pages
696 - 702
Database
ISI
SICI code
0032-5791(1997)76:5<696:EODTIS>2.0.ZU;2-X
Abstract
The present study investigates the threonine requirements of British U nited Turkey (BUT) Big 6 turkey toms from 0 to 4, 8 to 12, and 16 to 2 0 wk of age. Growth, feed conversion, and carcass quality responses to increasing dietary threonine levels were measured. From 0 to 4 wk of age (57 g to 1.1 kg live weight), a dietary threonine level of about 0 .95% (3.3 g/Mcal ME) was found to be adequate to obtain optimum growth and feed conversion. From 8 to 12 wk of age (4.0 to 8.6 kg live weigh t), there was no significant response to dietary threonine beyond the basal level of 0.69% (2.2 g/Mcal ME). From 16 to 20 wk of age (13.1 to 18.7 kg live weight), a threonine level of about 0.58% (1.8 g/Mcal ME ) appeared to be adequate to obtain optimum growth. For optimum breast meat deposition, a higher level in the range of 0.64% (2.0 g/Mcal ME) dietary threonine was required. The present findings may point to the importance of threonine as potentially third limiting amino acid afte r methionine and lysine in cereal-based turkey diets.