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Digestible Threonine Requirement of Broiler Chickens During the Period Three to Six and Six to Eight Weeks Posthatching
- Source :
- Poultry Science. 75:1253-1257
- Publication Year :
- 1996
- Publisher :
- Elsevier BV, 1996.
-
Abstract
- Four experiments were conducted to determine the digestible Thr requirement of commercial broiler chickens (Ross x Hubbard) during the period 3 to 6 and 6 to 8 wk posthatching. Threonine-deficient corn-peanut meal basal diets (3,200 MEn/kg) contained 20% CP and 0.50% Thr for 3- to 6-wk-old birds, and 18.3% CP and 0.50% Thr for 6- to 8-wk-old birds. True digestibility assessment using cecectomized roosters indicated that Thr was 81% digestible in both basal diets. Thus, both diets contained 0.40% digestible Thr. Growth rate and feed efficiency of chicks fed the corn-peanut meal basal diets supplemented with surfeit Thr was equal to that of chicks fed a 20% CP Met-fortified corn-soybean meal diet. Graded doses of Thr produced marked responses (P0.05) in weight gain and feed efficiency in birds of both age groups. Maximal feed efficiency was achieved at 0.61% digestible Thr in 3- to 6-wk-old birds and at 0.52% digestible Thr in 6- to 8-wk-old birds. Extrapolating these digestible Thr requirements to total requirements for chicks consuming corn-soybean meal diets (Thr digestibility = 87%) results in estimates of 0.70 and 0.60% for broiler chickens during the growth periods 3 to 6 and 6 to 8 wk posthatching, respectively. These estimates are lower than those of NRC (1994) but are in close agreement with those obtained from ideal protein calculations, i.e., Thr requirements should be 70% of lysine requirements for chicks 3 to 8 wk of age.
- Subjects :
- Male
Threonine
Aging
Arachis
Period (gene)
Biology
Zea mays
Feed conversion ratio
Basal (phylogenetics)
Animal science
Broiler chick
Animals
Analysis of Variance
Meal
Dose-Response Relationship, Drug
digestive, oral, and skin physiology
Nutritional Requirements
Broiler
food and beverages
General Medicine
Amino acid requirement
Animal Feed
Diet
Digestion
Female
Animal Science and Zoology
Soybeans
Chickens
Subjects
Details
- ISSN :
- 00325791
- Volume :
- 75
- Database :
- OpenAIRE
- Journal :
- Poultry Science
- Accession number :
- edsair.doi.dedup.....1785bcb1d301724c8e3f003fd07ec12d