Excretion of Volatile Fatty Acids in the Feces of Calves:II. Relationship between Digestibility of Calf Starter and Volatile

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Two male Holstein calves were fed a commercial calf starter of three forms, gruel, pellet, and mash, in turn. The apparent digestibilities, rumen volatile fatty acid (VFA) and feces VFA were determined on the calves from 5 weeks to 13 weeks of age.When calves were fed calf starter in gruel, the digestibilities of crude protein (C. P.) nitrogen-free extract (N. F. E.), and starch were significantly lower than when fed in pellet. The amount of VFA excreted in the feces was larger and especially that of propionic acid, butyric acid, and valeric acid was ten times as large as that in the case of pellet. When calves were fed in pellet, the highest digestibilities were determined in C. P., ether extract (E. E.), and N. F. E.. When the same pellet was given, the digestibilities of C. P., E. E., and crude fiber (C. F.) at 7 weeks of age were higher than those at 5 weeks. On the other hand, the relative molar per cent of acetic acid in the feces was higher at 7 weeks than at 5 weeks, but that of propionic and butyric acid was lower at 7 weeks than at 5 weeks. Mashed calf starter showed a little lower digestibilities of C. P., E. E., and N. F. E., than pellet calf starter. VFA in the feces were not different between them. The VFA in the rumen of calves were not correlative with digestibilities and the form of feed used.
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