Hostname: page-component-586b7cd67f-tf8b9 Total loading time: 0 Render date: 2024-11-26T16:31:43.963Z Has data issue: false hasContentIssue false
  • English
  • Français

390. The estimation of losses of butterfat in churning

Published online by Cambridge University Press:  01 June 2009

F. H. McDowall  and
A. K. R. McDowell
F. H. McDowall
Affiliation:
The Dairy Research Institute (N.Z.) Palmerston North, New Zealand
A. K. R. McDowell
Affiliation:
The Dairy Research Institute (N.Z.) Palmerston North, New Zealand
Get access Rights & Permissions [Opens in a new window]

Extract

The Bird & Derby method of calculating percentage butterfat loss in buttermilk is in error because it assumes that all the buttermilk in the granules at draining is retained in the buttermilk, whereas much of it is washed out in the wash water. Lactose estimations in butter and buttermilk confirm Udy's finding that butter contains about 10% of buttermilk. The Udy formula, viz.

is therefore in this respect correctly based and can be applied to individual churnings of butter in the same way as the Bird & Derby formula has been applied. The Bird & Derby formula should be discarded except for use when the granules are not washed with chill-water.

Both the Udy and the Bird & Derby formulae do not allow for the content of fat in the buttermilk retained in the butter or for the influence of fat content of the buttermilk on the calculated quantity of serum lost. When these factors are taken into account the Udy formula becomes

The correction +0·0012f F is not significant.

Type
Original Articles
Information
Journal of Dairy Research , Volume 16 , Issue 2 , October 1949 , pp. 227 - 234
Copyright
Copyright © Proprietors of Journal of Dairy Research 1949

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

(1)Udy, W. H. (1929). N.Z. J. Sci. Tech. 11, 249.Google Scholar
(2)Udy, W. H. (1931). Bull. N.Z. Dept. sci. industr. lies. no. 33.Google Scholar
(3)McDowall, F. H. (1936). N.Z. J. Sci. Tech. 19, 682. (Pub. D.R.I. (N.Z.) no. 110.)Google Scholar
(4)Bird, E. W. & Derby, H. A. (1937). Res. Bull. la agric. Exp. Sta. no. 214.Google Scholar
(5)Wiley, W. J. (1939). N.Z. Dairym. August (Publ. D.R.I. (N.Z.), no. 125).Google Scholar
(6)Wiley, W. J. (1939). J. Coun. sci. industr. Res. Aust. 12, 391.Google Scholar
(7)Wilster, G. H., Robichaux, R. P., Stout, R. E. & Stein, R. W. (1941). Bull. Ore. agric. Exp. Sta. no. 397.Google Scholar
(8)McDowell, A. K. R. (1941). J. Dairy Res. 12, 131.Google Scholar
(9)British Standards Institution (1930). Brit. Stand. Specif. no. 769.p. 16.Google Scholar
(10)McDowall, F. H. & Dolby, R. M. (1936). J. Dairy Res. 7, 156.Google Scholar