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A preliminary study of variations in free-choice intake of the components of a standard ration and breeding as possible factors in the occurrence of lameness in pigs

United States Department of Agriculture

Abstract

Frequent cases of lameness, together with leg-bone deformities, have occurred among the pigs on record-of-performance tests conducted during recent years at the National Agricultural Research Center, Beltsville, Md. Nearly 20 percent of the litters farrowed in 1935 contained animals which showed varying degrees of lameness. Furthermore, reports from state experimental stations cooperating in the record-of-performance work have indicated a similar disturbance among experimental animals. The seriousness of the situation prompted a preliminary study of the problem which is given in the present paper. This study has been limited to the litters farrowed in 1935 and has consisted of an examination of the feed-lot data, of certain laboratory tests, and other data. The object has been to determine what factors may be involved, especially those relating to faulty mineral metabolism.

The record-of-performance tests have been conducted according to an plan formulated a number of years ago by those cooperating on the problem.