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The purpose of this study was to investigate the potential benefits of yeast cell wall (YCW) on the gastrointestinal development of weaned calves. Twenty healthy Holstein male calves (BW = 92 ± 8.29 kg and 60 ± 5 d of age) were randomly allocated into 2 groups: CON with no YCW, and YCW (accounted for 0.16% of the basal diet). The dietary concentrate-to-roughage ratio was 40:60. All the calves were fed regularly twice a day at 09:00 and 16:00 and had free access to water. The experiment lasted for 60 d. The results showed that calves fed YCW showed higher ( P  &lt; 0.05) length, width, and surface area of papillae in the ventral sac of the rumen as compared to CON. For the dorsal sac of the rumen, the muscularis thickness was thicker ( P  &lt; 0.05) in the YCW group when compared with CON group. The villus height of YCW calves was higher ( P  &lt; 0.05) than that of CON in the ileum. Calves supplemented with YCW also showed a higher ( P  &lt; 0.05) villus height-to-crypt depth ratio in the ileum. The YCW calves exhibited a greater ( P  &lt; 0.05) thickness of the wall in the duodenum and jejunum. Calves supplemented with YCW improved ( P  &lt; 0.05) the claudin 1 mRNA expression in the ileum and occludin mRNA expression in the jejunum and ileum. The YCW increased ( P  &lt; 0.05) the contents of secretory immunoglobulin A in the jejunum and ileum of calves. In conclusion, dietary supplementation with YCW could improve the gastrointestinal development of weaned calves.

Dietary supplementation of yeast cell wall improves the gastrointestinal development of weaned calves