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648. Weight Changes in grazing cows

Published online by Cambridge University Press:  01 June 2009

C. C. Balch
Affiliation:
National Institute for Research in Dairying, University of Reading
C. Line
Affiliation:
National Institute for Research in Dairying, University of Reading

Extract

1. Under various feeding regimes the entire contents of the reticulo-rumen of fistulated Shorthorn cows were repeatedly removed, weighed, sampled and returned.

2. With cattle grazing grass/clover swards, but not with others grazing green cereals, there was a very marked tendency for less digesta to be found in the reticulo-rumen than with several winter diets.

3. An average fall of 71±24 lb. was found in the weight of a mixed herd of thirty-eight Friesian and Shorthorn cows when they were changed suddenly from winter diets to grazing. Simultaneous observations on three fistulated cows showed that 84% of such short-term variation in weight could be explained by variation in the weight of the digesta in the reticulo-rumen. It is likely that smaller, parallel variations in the weight of the contents of the remainder of the gut accounted for most of the remaining differences.

Type
Original Articles
Copyright
Copyright © Proprietors of Journal of Dairy Research 1957

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References

REFERENCES

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