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Pig Journal Volume: 53
Publication date: May 2004

Proceedings Section

PORCINE LORDOSIS AND KYPHOSIS (A THIRD VARIANT OF 'HUMPY-BACK') ASSOCIATED WITH INCREASED MUSCLE MASSES
R. Pearson and S.H. Done

Abstract
Lordosis and kyphosis in pigs - also known as 'Humpy-back' - is classified by the authors into three variants. This paper deals with the third variant affecting growers and finishers. A case history, describing the condition in a 500 sow commercial unit, is lucidly presented. Herd history, clinical signs and post-mortem features are faithfully recorded. No behavioural or environmental components to this condition were detected; but evidence strongly suggested that genetic factors were involved.

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