The highest ADG in SPC fed animals could be the effectof higher (p<0.05) average daily feed intake (ADFI), andeven the F/G was significantly improved in this group. Aspreviously mentioned, the CP concentration of SPC washighest, and probably the piglets on this diet receivedhigher ADFI and thereby received more CP and fastergrowth rate. The findings in the present study againconfirmed that FSP could significantly improve the ADGthan SBM fed group that we reported earlier (Yun et al.,2005). There was a linear increase in ADFI because offeeding processed soy proteins was also reported by Min etal. (2004). The F/G was inferior in SBM fed animals at alltimes in the present study. The animal performance wassuperior with SPC diet than others, which could also beattributed to its higher apparent total tract nutrientdigestibilities than others. HP300 showed similar ADG toSPC only during 15-35 d. Several studies have reportedgreater ADG and improved feed efficiency in weaned pigsfed diets based on milk products compared to those fedisolated soy products (Maner et al., 1961; Wilson andLeibholz, 1981a; Walker et al., 1986b) or soybean meal The reason for lower ADG was poor palatability; oneof the distinct problems with SBM-based diets as wasmentioned by Sohn et al. (1994). Although the palatabilityproblem was not more prominently observed in the presentresearch, but similar response of lower feed intake andADG in SBM fed diet when compared with dried skim milk(DSM), ISP (isolated soy proteins), and wheat gluten feddiets were also noted by Chae et al. (1999). In our presentstudy, during all periods we found no difference in HP300,FSP-A and FSP-B with respect to ADG.
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