The effects of different types of compound acidifiers (encapsulated and non-encapsulated) in maize-soybean basic diets on acidity and development of the gastrointestinal tract in weaning piglets were investigated in this study. 64 28-day-old weaned Landrace×Yorkshire hybrid piglets with average weight of (7.00±0.10) kg were selected and grouped into four treatments with four pigs (half boars and half sows) in each repeat of four repeats in each treatment based on single-factor test design principles, and the pre-test period was 3 days but the test period was 35 days. The results showed that compared with acid-free diet group, encapsulated compound acidifier could reduce pH of stomach and intestinal in weaning piglets significantly (P<0.01), while Test group 1 could also increase the relative weight of stomach and intestinal in piglets significantly (P<0.05). Compared with non-encapsulated acidifier, encapsulated compound acidifier could greatly decrease pH in jejunum and ileum of weaning piglets (P<0.05) or relative weight of stomach in piglets (P<0.05), while Test group 1 could also enhance the relative weight of intestinal in piglets significantly (P<0.01). In addition, encapsulated compound acidifiers significantly increased the ratio between the villus height and crypt depth of jejunum (P<0.01). Accordingly, the microencapsulated compound acidifier in diets of weaning piglets can promote the development of gastrointestinal tracts for piglets by reducing pH of gastrointestinal tracts.
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