Hostname: page-component-78c5997874-ndw9j Total loading time: 0 Render date: 2024-11-08T02:57:23.170Z Has data issue: false hasContentIssue false
  • English
  • Français

447. Milk yield in relation to infection with Streptococcus agalactiae

Published online by Cambridge University Press:  01 June 2009

D. H. McLeod  and
S. M. Wilson
D. H. McLeod
Affiliation:
School of Agriculture, Edinburgh
S. M. Wilson
Affiliation:
School of Agriculture, Edinburgh
Get access Rights & Permissions [Opens in a new window]

Extract

The records of milk yield and infection with Streptococcus agalactiae in four herds over periods of 9–13 years were analysed, using rigorous methods of control in the comparison of yields of infected and healthy cows. Fifty-seven cows which became infected in the second to sixth lactations yielded significantly more (56·5 ± 20·4 gal./lactation; P = 0·01) before infection than did non-infected animals in corresponding periods. In thirty-two animals infected in the second to fifth lactations an average apparent loss of 194·2 ± 28·3 gal. was found for the first lactation in which infection was detected. This represents a loss of about 24 % of the lactation yield.

Type
Original Articles
Information
Journal of Dairy Research , Volume 18 , Issue 3 , October 1951 , pp. 235 - 239
Copyright
Copyright © Proprietors of Journal of Dairy Research 1951

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)Cunningham, A., Stirling, A. C., Raymont, J. K. B. & Wilson, M. A. (1946). Tech. Bull. Edinb. Coll. Agric. 1.Google Scholar
(2)Minett, F. C. & Martin, W. J. (1936). J. Dairy Res. 7, 122.CrossRefGoogle Scholar
(3)Ward, A. H. (1939). Emp. J. exp. Agric. 7, 350.Google Scholar
(4)Ward, A. H. (1942). Rep. N.Z. Dairy Bd, 18, 48.Google Scholar
(5)Ward, A. H. (1944). Rep. N.Z. Dairy Bd, 20, 52.Google Scholar