Develop-ment of rumen function of calves, with special reference to changes in digestibilities of hay crude fibre in the rumen

Omori, S.; Kobayashi, T.; Kawabata, A.; Hamada, T.; Kameoka, K.

Bulletin Nat Inst Anim Ind chiba 12: 1-8

1966


Accession: 024468755

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Abstract
Eight Holstein male calves with rumen fistulas were divided into 3 groups: 3 were fed whole milk and, from 10 days old, Italian ryegrass hay; 3 were fed whole milk and, from 30 days old, the same hay; 2 were fed whole milk and, from 10 days old, calf starter ("Jinkonyu", commercial) and the hay, and weaned at 46 days. Digestibility of hay exude fiber, and cellulolltic activity and rate of VFA production from starch in the rumen were estimated by the silk sack method and the in vitro method, respectively. Digestibility increased within a week after hay feeding and the adult level was observed at 50-60 days of age. The digestibility of hay crude fiber in early weaning calves was clearly lower than that in hay feeding calves. In the calves fed hay, cellulolitic activity in the rumen was very low before hay feeding and suddenly rose on the 2nd day of hay feeding. In early weaning calves, cellulolitic activity and rate of VFA production reached a high level at 50-60 days of age. These values were clearly higher than those of calves fed hay.