Experimental design
A total of 175 newly weaned pigs were allotted to five dietary treatments in three phases (seven, seven, and 14 days, respectively). Five phase 1 diets that all contained 15% whey powder and 3% protein plasma, were formulated. The negative control diet contained no other animal products. The positive control diet contained fish meal, and three experimental diets contained chicken meal, poultry by-product meal, or fermented soybean meal. The Phase 2 and Phase 3 diets were formulated in the same way except that protein plasma was excluded, and the inclusion rate of whey powder was decreased to 10% in Phase 2 and 5% in Phase 3.
Table 1. Inclusion rates of selected ingredients in Phase 1, Phase 2, and Phase 3 diets