Organic Value Recovery Solutions LLC 168 The use of soldier fly prepupae as a replacement for blood plasma in phase 1 and 2 nursery diets. C. R. Dove*, G. L Newton, and D. C. Sheppard, University of Georgia, Tifton. Two studies were conducted to determine if dried soldier fly prepupae (SF) could be used to replace blood plasma (BP) in nursery diets. In study 1, 84 pigs, weaned at 21 d of age, were randomly allotted to dietary treatment. Pigs were housed in an environmentally controlled nursery with ad libitum access to feed and water over the 35 d study. Experimental treatments were: 1) 5% BP during phase 1, 2.5% BP during phase 2 (PLA); 2) 2.5% BP, 2.5% SF during phase 1, 1.25% BP, 1.25% SF during phase 2 (COMBO); 3) 5% SF during phase 1, 2.5% SFL during phase 2 (SFP). All pigs were fed a common phase 3 diet with no BP or SF. The SF were produced on swine and poultry manure, resulting in over a 50% reduction of manure DM. In study 2, 105 pigs were weaned, housed and managed as in study 1. Dietary treatments were the same, except that dietary Lys, Thr, Trp and Met concentrations were equalized across diets. In both studies, data was analyzed using SAS Mixed Models procedures, with the pen as the experimental unit. In study 1, pigs fed SFP tended to have decreased ADG during phase 1 and had decreased (P < 0.05) ADG during phase 2. During phases 1 and 2 of study 1, pigs fed SFP had decreased (P < 0.05) ADFI. Pigs fed COMBO had ADG and ADFI similar (P > 0.1) to pigs fed PLA during phases 1 and 2. Over the 35 d study, ADG was decreased (P < 0.05) in pigs fed SFP compared to those fed PLA, with the COMBO diet being intermediate. ADG for the 35 d study 1 was 383, 369, and 331 g/d for the PLA, COMBO and SFP diets, respectively. Feed efficiency was not affected (P > 0.1) by the COMBO or SFP treatments compared to pigs fed PLA in study 1. In study 2, pigs fed SFL had decreased (P < 0.05) ADG compared to the PLA or COMBO fed pigs during phase 1. During phase 2 and 3 of study 2, both the SFP and COMBO fed pigs had decreased (P < 0.05) ADG compared to the PLA fed pigs. Daily feed intake was decreased (P < 0.05) in pigs fed SFP during phases 1 and 2 in study 2 compared to the PLA or COMBO fed pigs. Gain:feed ratio was decreased (P < 0.01) in pigs fed the COMBO diet during phase 3 and over the entire 35 d study. The data from these studies indicate that SFP can be used to replace 50% of the BP in phase 1 nursery diets and that supplementation of SF diets with amino acids did not improve pig performance. Key Words: Pigs, Soldier Fly Prepupae, Growth Journal of Animal Science Vol. 81, Supplement 2, p 68. (2003) © Organic Value Recovery Solutions 2010 © Organic Value Recovery Solutions 2010