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A COMPARISON OF SPERMATOZOA PRODUCTION AND SPERMATOZOA OUTPUT OF YORKSHIRE AND LACOMBE BOARS

Summary.: A procedure is described for measuring daily spermatozoa production (DSP) from quantitative testicular histology. The mean DSP, as determined by this procedure, was 16·5 x 10⁹ for ten Yorkshire boars (av. age 11·2 months) and 17·8x 10⁹for ten Lacombe boars (av. age 11·3 months). The spermatozoa output was 88% of the DSP for the Yorkshire boars and 83% of the DSP for the Lacombe boars when semen samples were collected at 48-hr intervals. Spermatozoa output was significantly correlated ( ±0·54) with spermatozoa production. The two breeds did not differ significantly with respect to DSP, but within breeds certain boars produced more spermatozoa than others (P<0·05). The DSP per gram of testis was 25·1 x 10⁶ for Yorkshire boars and 24·3 x 10⁶ for Lacombe boars (P>0·05). The relative volume of the testes occupied by spermatids with round nuclei did not differ significantly between breeds, among boars within breeds nor between right and left testes. This suggests that for the boar, spermatozoa production is mainly a function of testis size. Results obtained by the procedure for measuring DSP were not significantly influenced by different staining techniques.

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