caa a22 4500 388060492 CHVBK 20180307125119.0 cr unu---uuuuu 161130e199808 xx s 000 0 eng 10.1017/S1357729800009851 doi S1357729800009851 pii (NATIONALLICENCE)cambridge-10.1017/S1357729800009851 The effect of dietary energy concentration and lysine/digestible energy ratio on growth performance and nitrogen deposition of young hybrid pigs [Elektronische Daten] An experiment was conducted to examine the effects of dietary lysine/digestible energy (DE) ratio (g/MJ) and dietary energy concentration on growth performance and body composition of young hybrid gilts from 9·1 to 25·4 kg live weight. Seven pigs were assigned to each of 10 dietary treatments consisting of lysine/DE ratios from 0·6 to 1·4 in 0·2 g/MJ increments and two DE concentrations (14·25 and 16·40 MJ/kg). Food was provided ad libitum and at 25·4 kg all pigs were slaughtered and body composition was determined. Responses to lysine/DE ratios were different for each DE concentration. The pigs given the 16·40 MJ/kg DE diets had a higher daily live-weight gain (DLWG) and nitrogen deposition rate (NDR) than those given the 14·25 MJ/kg diets up to the 1·2 g/MJ lysine/DE ratio. Beyond this point no DE effects were evident. Lipid deposition rate (LDR) was higher for all 16·40 MJ/kg diets as compared with the 14·25 MJ/kg diets and decreased with increasing lysine/DE ratio. The 14·25 MJ/kg diets resulted in increasing efficiency of nitrogen and gross energy utilization with increasing lysinel DE ratio up to the 1·0 g/MJ ratio after which it declined. Efficiency of lipid utilization decreased with increasing lysine/DE ratio for all 14·25 MJ/kg diets. The 16·40 MJ/kg diets resulted in a decrease in nitrogen and gross energy utilization efficiency with increasing lysine/DE ratio while lipid efficiency decreased up to the 1·0 g/MJ lysine/DE ratio after which it increased. Young hybrid pigs given high energy diets appear to be less sensitive to dietary lysine/DE ratio than those given lower energy diets. The optimum lysine/DE ratio for the genotype tested from 9 to 25 kg live weight was of the order of 1·2 g/MJ for both DE concentrations. The maximum DLWG and NDR of the genotype tested over the live-weight range of 9 to 25 kg appears to be of the order of 620 and 17 g/day (106 g/day protein deposition rate) respectively. Copyright © British Society of Animal Science 1998 digestible energy nationallicence lysine nationallicence nitrogen nationallicence pigs nationallicence Van Lunen T. A. University of Nottingham, Sutton Bonington Campus, Loughborough LE12 5RD Cole D. J. A. University of Nottingham, Sutton Bonington Campus, Loughborough LE12 5RD Animal Science Cambridge University Press 67/1(1998-08), 117-129 1357-7298 67:1<117 1998 67 ASC https://doi.org/10.1017/S1357729800009851 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S1357729800009851 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Van Lunen T. A. University of Nottingham, Sutton Bonington Campus, Loughborough LE12 5RD NATIONALLICENCE 700 1- Cole D. J. A. University of Nottingham, Sutton Bonington Campus, Loughborough LE12 5RD NATIONALLICENCE 773 0- Animal Science Cambridge University Press 67/1(1998-08), 117-129 1357-7298 67:1<117 1998 67 ASC CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge