[Changes in acetylcholinesterase activity of the nerve system of swine ovaries in different periods of lactation].

Morphological features of AChE-positive nerves in the ovaries of sows in different periods of lactation, as well as the activity of AChE in these nerves, have been described. For the tests there were used twenty Large White Polish breed primipara sows weighing about 100 kg each and coming from the same industrial pig fattening farm. The animals were divided into three groups: I-7 heads 48 hrs after parturition, II-6 heads 14 days after parturition, III-7 heads 42 days after parturition (on the first day after weaning). The sows being slaughtered and carefully bleeded, both their ovaries were put to examination. To detect AChE-positive nerves in the organs there was used Karnovsky and Roots' method, while to determine the activity of AChE--Ruckenbusch and Ruckenbusch's one. There have been described morphological features and distribution of AChE-positive nerves in the ovaries, finding out few delicate nerve fibres showing degenerative lesions. As lactation expired, the number of the nerves was getting smaller. The highest activity of AChE was found in the ovaries of sows just after parturition, while the lowest in late lactation period. The AChE-positive nerves in the ovary seem to be under control influence of some ovarian steride hormones, like the adrenergic nerves innerving the ovary and other female genital organs.