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Maintenance threonine requirement and efficiency of its use for accretion of whole-body threonine and protein in young chicks

Published online by Cambridge University Press:  09 March 2007

Hardy M Edwards III ,
David H Baker ,
Sergio R Fernandez  and
Carl M Parsons
Hardy M Edwards III
Affiliation:
Department of Animal Sciences and Division of Nutritional Sciences, University of Illinois, Urbana, Illinois 61801, USA
David H Baker
Affiliation:
Department of Animal Sciences and Division of Nutritional Sciences, University of Illinois, Urbana, Illinois 61801, USA
Sergio R Fernandez
Affiliation:
Productos Roche, SA de CV, Av. Universidad Num. 902, Col Sta. Cruz Atoyac Del. Benito Juarez, CP 03310 Mexico City, DF, Mexico
Carl M Parsons
Affiliation:
Department of Animal Sciences and Division of Nutritional Sciences, University of Illinois, Urbana, Illinois 61801, USA
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Abstract

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Broiler chicks were fed on chemically-defined crystalline amino acid diets containing graded levels of L-threonine (Thr) during the period 10–20 d post-hatching. Doses of Thr represented 5,10,15,40,55,70 and 95% of its ideal level for maximal weight gain and feed efficiency. Other amino acids were maintained at minimized excess levels that were 15% (of ideal) above the various doses of Thr. Following 10d of feeding and a 24h fast, chicks were killed for whole-body protein and amino acid analysis. Using pen accretion means, weight gain (r20·98), protein accretion (r2 0·99), and Thr accretion (r2 0·99) were linear (P<0·01) functions of Thr intake. Slope of the Thr accretion regression line indicated that 82% of the Thr intake was recovered in whole-body protein. At zero Thr intake, chicks lost 11·9 mg Thr/d. The Thr maintenance requirement was 45·7 mg/d per kg body weight 0·75. Increasing doses of Thr resulted in increased (P<0·05) concentrations of methionine, isoleucine, histidine and lysine in whole-body protein. Other indispensable amino acids, including Thr, also tended to increase. Whole-body glycine, proline, serine and cystine concentrations decreased (P<0·05) as Thr was increased in the diet. The maintenance need for Thr represented 5·5% of the total need for Thr. The data suggest that efficiency of Thr utilization is constant at all levels of Thr intake between 5 and 95% of the level required for maximal weight gain and feed efficiency.

Keywords

ThreonineAmino acidsBroiler chicks
Type
Animal Nutrition
Information
British Journal of Nutrition , Volume 78 , Issue 1 , July 1997 , pp. 111 - 119
Copyright
Copyright © The Nutrition Society 1997

References

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