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Lipid and Dry Weight of Bovine Seminal Plasma and Spermatozoa from First and Second Ejaculates¹

Department of Animal Industries, University of Connecticut, Storrs

ABSTRACT

Mean values for various measurements on 26 ejaculates of bull semen were as follows: seminal plasma dry weight (DW) 96 mg per ml; lipid 1.21% (dry weight basis), 1.16 mg per ml: spermatozoa DW 24.3 mg per ml, 19.3 µg per 10⁶; lipid 15.1%, 362 mg per ml and 2.87 µg per 10⁶. Values for whole semen from 27 paired first and second ejaculates were DW 112, 106 mg per ml and 78, 126 µg per 10⁶; lipid 4.61, 3.41%, 5.12, 3.62 mg per ml and 3.42, 3.86 µg per 10⁶, respectively. Seminal plasma and spermatozoa from 12 first and second ejaculates were analyzed; seminal plasma contained 96, 94 mg per ml DW; 1.21, 1.03% lipid; 1.16, 0.97 mg lipid per ml; whereas spermatozoa contained 30, 25 mg DW per ml; 19.4, 19.3 µg DW per 10⁶; 13.7, 14.6% lipid; 4.18, 3.68 mg lipid per ml; 2.68 and 2.81 µg lipid per 10⁶, respectively. Seminal plasma from first ejaculates contained a higher (P < 0.01) lipid per cent than seminal plasma from second ejaculates; whereas, per cent lipid in spermatozoa was higher (P < 0.05) in second ejaculates.

¹ Scientific contribution no. 235, Agricultural Experiment Station, University of Connecticut, Storrs. This investigation was supported in part by Public Health Service Research Grant GM 08738 from the National Institutes of Health, Division of General Medical Sciences.

² Present address: Animal Reproduction Laboratory, Colorado State University, Fort Collins 80521.