从各阶段的排泄率可以看出，仔猪铜的排泄率要高于生长肥育猪，而锌则有随添加量减少排泄率降低的趋势。
The Cu excretion rate is higher in piglets than that of growing and finishing pigs, the Zn excretion decreased as the Zn addition to the diets decreased.
大中断– 将整个猪群清空，包括从断奶到屠宰阶段的猪只。然后重新再从断奶仔猪开始转入新猪。
Maxi-break - the entire herd from weaning to slaughter is depopulated, and repopulation carried out from weaning up.
阐述仔猪不同断奶日龄及相应阶段饲喂体系的实施依据和应用现状，重点分析不同断奶日龄及相应阶段饲喂体系的利弊。
The basis and current situation of the various weaning ages and phase feeding programs for piglets are expounded, especially their advantages and disadvantages are analysed in this review.
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