G. Nacu

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G. Nacu, C. Pascal, Şt. Ciornei

The biological material was represented by 15 boars of Large White, Duroc and Landrace breed. Age of the boars was between 8 months and 31 months. Collecting frequency was reduced: one collecting followed by five days pause. At each collecting it was determined the volume of the ejaculation, the mobility of the spermatozoids and the concentration. Those indices were at the basis of determination of the total number of spermatozoids/ejaculation and the medium daily production of spermatozoids. This last parameter had values 15.7 ± 0.4 billion, with oscillation between 13.6 ± 0.3 billion for Great White boars and 19.1 ± 0.2 billion for Landrace boars. The differences between the two breeds were significant (p<0.01). Depending on the age of boars, the differences were insignificant: 13.1 ± 0.3 billion, at the boars with the aged between 8-18 months and 18.3 ± 0.5 billion at the boars with the aged between 18 and 31 months (p>0.05). Depending on the sampling season, there was difference between summer (12.5 ± 0.2 billion) and autumn (17.4 ± 0.5 billion) (p<0.01). The research undertaken showed that the average daily production of sperm from boars was influenced both by internal environmental factors (race, age, and individual) and external environmental factors (season).

Key words: boars, average daily sperm production, factors of influence