References
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- Malmo , J. 1985 . Proceedings No. 78, Dairy Cattle Production , 388 – 389 . The Post-Graduate Committee in Veterinary Science, University of Sydney .
- Oehme , F.W. and Prier , J.E. 1974 . Textbook of Large Animal Surgery , 1st edition , 114 – 114 . Baltimore : The Williams and Wilkins Company .