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R. J. KOMAREK, B. W. PICKETT, E. W. GIBSON and R. G. JENSEN

Summary.

In forty-one ejaculates from six boars totalling 7·5 1. the spermatozoa, analysed on an individual ejaculate basis where possible, contained an average of 12·0% lipid which was composed of phospholipids (74·7%), cholesterol (12·6%), diglycerides (5·7%), triglycerides (4·5%) and wax esters (2·4%). Only a small portion of the dry matter of seminal plasma was lipid (0·23%), which was composed of phospholipids (64·7%), cholesterol (17·7%), diglycerides (5·8%), triglycerides (5·3%) and wax esters (6·5%). The gel fraction contained 0·32% lipid, composed of 51·6% phospholipid, 28·3% cholesterol, 6·3% diglycerides, 6·0% triglycerides and 7·8% wax esters.