Feed & Additive Magazine Issue 4 May 2021

SPECIAL STORY 44 FEED & ADDITIVE MAGAZINE May 2021 Focusing on the use of spray dried plasma (SDP) and spray dried egg (SDE) as an effective alterna- tive to replace ZnO and to participate in the reduc- tion and rational use of antibiotics, we found very clarifying studies. For example in the study carried out by Ocusu et al. in 2003, different diets with the same protein content and equivalent nutritional contribution were compared in a challenge against enterotoxigenic Escherichia coli (K88) in 90 weaned piglets of 10 days old, varying in the addition of ZnO, antibiotics, plasma, egg powder and other functional ingredients. The results showed that the addition of SDP and egg yolk resulted in a higher average daily gain compared to the rest of the di- ets, and even higher than the diets with inclusion of ZnO and antibiotics, as shown by the results tran- scribed in Table 1. On this basis, we can support the assertion of the suitability of plasma to replace ZnO with subsequent studies, such as the one carried out by the VEOS Group, in collaboration with Zootechnical Center, KU Leuven, Lovenjoel (W. Merckx, S. Massart, ID Kalmar 2015). In this study, 280 pigs were fed spray dried plasma powder (SDP) in the starter and pre- start diets and the performance of the piglets was studied during the entire weaning period in condi- tions of absence of ZnO and the prophylactic use of antibiotics. The results showed that SDP clearly reduced post-weaning diarrhea and improved initial technical performances. Although weaning occurred in the cur- rent trials without the prophylactic use of antibiotics, post-weaning infectious diarrhea was also not observed, as de- scribed in the table 2, called “Iso-nitrog- enous, partial replacement of soybean meal with spray-dried plasma (SDP) at a dose of 3% SDP during a two-week pre-starter phase on piglet post-weaning performance in absence of prophylactic use of antibiotics (Trial 1; N = 8 pens of 10 piglets each).” The spray dried egg powder (SDE) has also been the object of study, finding equally promising results. In another study carried out in Brazil (2006 Vilar da Silva et al.), use of SDE in the diet of pre-starter hens was studied, facing di- ets that contained either antimicrobial (coccidiostats) and / or growth promoters, or well SDE. The results showed that SDE is an effective substitute for anti- microbial and growth promoters, which, added to its high nutritional value, results in a highly valuable in- gredient. The results of the productive parameters in the different diets are summarized in table 3: Table 1. Adapted table extracted from Ocusu et al. en el 2003 ADG (g/day) Week 1 Week 2 G:F (g/g) Week 1 Week 2 Spray dried plasma + Egg yolk 137,9 189,1 186,7 276,0 AB 128,2 170,6 184,1 255,1 Egg yolk 100,1 149,6 146,9 136,5 ZnO 129,0 188,6 173,0 264,9 Table 2. Extracted from W. Merckx et al. 2015 2 wk pre-starter phase LWd0 Weight dip SRd0-13* SLWd13 NLWd13 ADFI ADG GFR - (kg) (%pigs) (%pigs) (kg) (kg) (g/d) (g/d) (kg/kg) SDP 5.1 3.8 97.5 6.1 6.0 191a 70 0.37 Control 5.1 7.5 92.5 6.1 5.6 150b 45 0.27 a,b different superscripts within a row indicate a significant difference at p < 0,001. *One additional control piglet died at day 1 and was excluded from all data. LW, live weight; SR, survival rate; SLW, survivor LW; NLW, net LW (SLW x SR x 0,01); ADFI, average daily feed intake; ADG, average daily gain; GFR, gain to feed ratio