Are suckling pig feed and trough feed the same thing?

Look at the suckling pig feed written by many manufacturers (7 days-35 days) is divided into suckling pig feed, small pig feed, medium pig feed, big pig feed, right? piglet feed is not piglet feed? now many feed manufacturers divide it in more detail, requiring five or even seven stages. General teaching trough feed starts from 5-7 days-weaning, piglet feed weaning to about 40 days, nursery feed about 60 days, then piglets, 30, 60 medium pigs, 60-120 big pigs 120-200-reply to qdet thank you