caa a22 4500 388062614 CHVBK 20180307125125.0 cr unu---uuuuu 161130e199812 xx s 000 0 eng 10.1017/S0007114598001639 doi S0007114598001639 pii (NATIONALLICENCE)cambridge-10.1017/S0007114598001639 Effect of essential:total nitrogen ratio on protein utilization in the growing pig [Elektronische Daten] 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. Copyright © The Nutrition Society 1998 Amino acids nationallicence Protein utilization nationallicence Pigs nationallicence Heger Jaroslav Biofaktory Praha s.r.o., Research Centre of Feed Additives, Na Chvalce 2049, 193 00 Praha 9, Czech Republic Mengesha Samson Institute of Tropical and Subtropical Agriculture, Czech Agricultural University, Praha, Czech Republic Vodehnal David Biofaktory Praha s.r.o., Research Centre of Feed Additives, Na Chvalce 2049, 193 00 Praha 9, Czech Republic British Journal of Nutrition Cambridge University Press 80/6(1998-12), 537-544 0007-1145 80:6<537 1998 80 BJN https://doi.org/10.1017/S0007114598001639 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0007114598001639 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Heger Jaroslav Biofaktory Praha s.r.o., Research Centre of Feed Additives, Na Chvalce 2049, 193 00 Praha 9, Czech Republic NATIONALLICENCE 700 1- Mengesha Samson Institute of Tropical and Subtropical Agriculture, Czech Agricultural University, Praha, Czech Republic NATIONALLICENCE 700 1- Vodehnal David Biofaktory Praha s.r.o., Research Centre of Feed Additives, Na Chvalce 2049, 193 00 Praha 9, Czech Republic NATIONALLICENCE 773 0- British Journal of Nutrition Cambridge University Press 80/6(1998-12), 537-544 0007-1145 80:6<537 1998 80 BJN CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge