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The aim of the present study was stating the influence of the value of vaccum pressure on the percentage ofoocytes aspirated from follicles, as well as their quality in heifers, cows, HF, sows and gilts crossbred Landrace.Follicles of >2 mm diameter were aspirated. The follicle liquid was obtained with application of the pressureequal to respectively –150, –100, –70, –50, –30 mm Hg respectively. Mean number of recovered oocytes inheifers and cows was respectively 13.3 and 8.4, while sows and gilts 27.5 and 16.3. An average number of theobtained oocytes in heifers and cows reached 61.42% and 48.9% and was not dependent on the size of the flow.The vaccum pressure value did significantly influence the number of aspirated oocytes of very good, sufficientand insufficient quality in heifers, as well as oocytes of sufficient and insufficient quality in cows. Alongsidewith an increase of vaccum pressure above 50 and 70 mm Hg in correspondingly heifers and cows, thepercentage of insufficient quality oocytes increased while the percentage of very good quality oocytes decreased.An average percentage of recovered oocytes of gilts and sows equalled to 79.1 and 85.2% and did not depend onthe size of the flow. In both gilts and sows the value of the vaccum pressure significantly influenced the numberof the recovered oocytes of all classes. Alongside with the growth of the pressure above 50mm Hg thepercentage of insufficient quality oocytes increased, while the percentage of very good and good quality oocytesdecreased

The influence of vaccum pressure on quality and number of recovered oocytes aspirated from ovarian follicles of swine and cows