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Effect of essential:total nitrogen ratio on protein utilization in the growing pig

Published online by Cambridge University Press:  09 March 2007

Jaroslav Heger ,
Samson Mengesha  and
David Vodehnal
Jaroslav Heger*
Affiliation:
Biofaktory Praha s.r.o., Research Centre of Feed Additives, Na Chvalce 2049, 193 00 Praha 9, Czech Republic
Samson Mengesha
Affiliation:
Institute of Tropical and Subtropical Agriculture, Czech Agricultural University, Praha, Czech Republic
David Vodehnal
Affiliation:
Biofaktory Praha s.r.o., Research Centre of Feed Additives, Na Chvalce 2049, 193 00 Praha 9, Czech Republic
*
*Dr Jaroslav Heger, present address: Biofaktory Praha s.r.o., Generala Piky 3, 613 00 Brno, Czech Republic, fax +42 05 510 0329, email [email protected]
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Abstract

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Two N balance experiments using growing pigs were conducted to study the effect of essential:total (E:T) N ratio on N retention and utilization. Purified diets contained casein and crystalline amino acids as the sole sources of N. E:T values ranged from 0·25 to 0·86 while either the concentration of total N (Expt. 1) or essential N (Expt 2) was kept constant. At a constant concentration of total dietary N, N retention and total N utilization were maximized with an E:T value of approximately 0·6, while essential N utilization gradually decreased as E:T increased. At a constant level of essential N, N retention remained unchanged until the E:T value reached 0·48 and then decreased. In Expt 2, maximum total N utilization was attained with an E:T value of 0·66 while N excretion and essential N utilization decreased with increased E:T value. These results suggest that under conditions of optimal protein utilization, essential amino acids are partially degraded and used for the synthesis of non-essential amino acids.

Keywords

Amino acidsProtein utilizationPigs
Type
Research Article
Information
British Journal of Nutrition , Volume 80 , Issue 6 , December 1998 , pp. 537 - 544
Copyright
Copyright © The Nutrition Society 1998

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