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The aim of the study was to examine the changes in the density of VAChT (marker of acetylcholine present)-, NPY-, VIP-, SOM-, SP- and nNOS-immunoreactive (IR) nerve terminals and co-localization of VAChT with the above-mentioned neurotransmitters after the occurrence of dexamethasone (DXM)-induced ovarian cysts in gilts. DXM administration led to an increase in the density of VAChT/SP-, VAChT/nNOS- and NPY-IR nerve terminals around the cystic walls. In DXM-treated animals an elevated number of VAChT- and SP-IR nerve endings was found close to the tertiary follicles. Moreover, in the gilts receiving DXM the density of NPY-IR nerve endings (that simultaneously co-localized VAChT) was high near the interstitial gland. An increase in the number of VAChT/SP- and VIP-IR nerve fibers around the medullar arteries (A) was observed in cystic ovaries, while the number of VAChT-IR nerve endings near the cortical A was lowered after DXM application. Furthermore, nerve fibers containing VAChT were absent around veins in the whole ovary of DXM-treated animals. After DXM injections, an increase in the number of VAChT/SP- and VAChT/nNOS-IR nerve endings in the cortical, as well as VIP- and nNOS-IR (co-existing with VAChT), nerve terminals in the medullar part of the autonomic ground plexus (GP) was present. However, the administration of DXM led to a drop in the density of SOM-positive nerve endings (also VAChT-IR) in the medullar subdivision of the GP. The present study shows that in the porcine ovaries with DXM induced cysts the pattern of cholinergic innervation, as well as the co-localization of VAChT and NPY, VIP, SOM, SP or nNOS, were changed. Data obtained also suggest that acetylcholine and the above-mentioned neurotransmitters effecting the functioning (steroidogenic activity, blood flow) of the polycystic ovaries may have a significant influence on the course of this pathological status.
The aim of the study was a histological evaluation of mucosa of the oviduct and uterus, regarding cystic ovarian degeneration in sows. Materials for the evaluation were received after the slaughtering of 294 sows at the age of two to five years. The sows were eliminated from breeding and culled due to disorders such as: anoestrus after weaning of piglets, return of oestrus, small litter size, high number of parturitions, bad condition after lactation, and age. Twenty of the 294 sows (6.8%) had cysts on the ovaries. The sows were divided into two groups: group 1 (12 sows) with polycystic ovaries and group 2 (8 sows) with simple cysts, which occurred unilaterally (3 sows) or bilaterally (5 sows). The studies demonstrated different kinds of ovarian cysts and structural changes in ovarian cortex, such as decreasing number of ovarian follicles of all generations and increase in follicular atresia. The histological state of tissues and changes of mucosa of the oviduct and uterus, regarding polycystic ovaries or single cysts on ovaries were compared. The single follicular cysts were not accompanied with important changes in the reproductive system. In the case of polycystic ovaries, the presence of cyst was connected with the occurrence of morphological changes in the endothelium of the oviduct and uterus, which could have been a reason of persistent infertility in pigs. An increase in the number of secretory cells with simultaneous decrease in ciliated ones, both in the ampulla and isthmus and covering the epithelium by secretions were observed in the oviduct. In our studies, we observed increasing proliferation of both glandular epithelium and surface epithelium. The terminal portion of the uterine glands was cystic dilated with remaining secretions. Hypersecretion of superficial epithelium was noted.
The subject of this wprk was the investigation of luteinizing hormone, progesterone, testosterone and total estrogens concentration in the peripheral plasma of 56 gilts with experimentally-induced hypo- and hyperthyroidism and with ovarian cystic degeneration. The blood samples were collected from the cannulated jugular vein at 19-23 days after last natural estrus, 5-10 times daily. The experiments resulted in significant deviations in plasma hormone profile during the periestrous period. The hypothyroid gilts showed a significant increase but hyperthyroid animals a decrease in level of LH accompanied by a significant peak of estrogens on the 22nd day of cycle. The cyst-bearing gilts exhibited a decreased level of LH, an increased concentration of progesterone and a changeable content of estrogens. It may be suggested that abnormalities in hormonal pattern in experimental gilts were caused by derangement of functional interrelationships in the pituitary-thyroid-ovarian axis which influence sex hormone synthesis and release.
The investigations were carried out on 75 infertile cows with cystic ovarian disease, and 25 control cows with corpus luteum. The blood concentrations of ketone bodies, free fatty acids, glucose, total cholesterol and progesterone were determined before cyst treatment with GnRH. Levels of ketone bodies and free fatty acids were higher and progesterone level was lower in cystic cows than in control ones. Pregnancy rate to 60 days was 54.6% after injection of GnRH. The low progesterone level and energy deficit negatively influenced the efficacy of ovarian cyst treatment with GnRH.
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