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The aim of the study was to describe a new method used for diagnosing uterine disorders and to present preliminary results regarding the incidence of this kind of endometritis in dairy cows. For its diagnosis, samples must be taken from the lumen of the uterine horns. This requires a special tool which consists of a catheter open at both ends/on both sides, a mandrel and a brush for the collection of samples. After sampling the brush is rolled on cytological glass, and the smear is stained using one of the classic methods. Following this procedure, a number of polimorphonuclear leucocytes (PMNL), other white cells and epithelial cells are counted. In order to diagnose the disorder, the percentage of PMNL is considered. In our trials, conducted in two experimental herds, subclinical endometritis was diagnosed in 69.7% of cows in one herd and in 38.3% of cows in the other herd during the fourth week post partum. Two weeks later, the incidence of this disease dropped to 43.3% and 17%, respectively. Only in 12.1% and 8.7% of cows after parturition the number of PMNL grew with the passage of time. More research is needed to evaluate the influence of cytological endometritis on reproductive performance and to examine the pathological and physiological nature of this disorder.
The aim of this study was to compare the bacterial flora of canine vagina and uterus and assess its composition during the estrus cycle. From 28 healthy bitches, vaginal smears and samples of uterine secretion by means of endoscopy were collected during the estrus cycle (anestrus, proestrus, estrus, metestrus) for bacteriological investigation. Similar bacterial flora were present in the vagina and uterus of bitches. Lactobacillus sp.,α-hemolytic streptococci, Staphylococcus intermedius, Pasteurella multocida and E. coli were most frequently found. The average number of isolates was 2.2 per vaginal sample and 1.4 per uterine sample, the uterine samples also showed a lower bacterial count. The composition of vaginal and uterine bacterial flora and amounts of bacteria varied during the estrus cycle. The highest bacterial count occurred during proestrus.
Concentration of oestrogens and histological changes in placentomes of cows at the ninth month of pregnancy and with retained membranes — Two experiments are described in the paper. In the first experiment, in 6 cows on 30, 15 and 5 days before parturition the levels of oestrone (El) and oestrone sulfate (E1S) were determined by the RIA and histological investigations of placentomes were performed. In the last month of pregnancy one could measure an increase in the level of oestrogens, especially El and morphological changes in the tissue of placentomes (loss of cryptal epithelium, migration of binucleate giant cells into the maternal placenta and decrease of their number). In the second experiment, in 6 cows with retained placenta and in 6 cows with physiological calving the level of El and E1S were determined during the last 7 days of gestation and the placentomes, obtained immediately after calving, were histologically examined. In the group of cows with retained placenta the concentration of El was lower and incomplete morphological changes of placentomes, like the presence of cryptal epithelium and a large number of binucleate giant cells were observed. The role of oestrogens in the process of placenta maturation before parturition is discussed.
Placentomes were obtained immediately after calving from 34 cows with retained placenta and 19 cows with normal placental release. All cows had a normal duration of pregnancy. In placentomes from cows without retained placenta the lack of cryptal epithelium and a small number of binucleate cells was noted. In the group with retentio secundinarum, 73.6% of the cows had delayed maturation of placenta (presence of cryptal epithelium and numerous binucleate cells), 17.6% had placentitis (infiltration of leucocytes) while 8.8% showed proliferation of connective tissue of caruncles. Thus, the major cause of disturbances in placental release was the delayed maturation of placenta.
The experiment was carried out on nine sexually mature, aged 1-3 years, clinically healthy bitches being in anoestrus. The animals were divided into two experimental groups and one control group. The bitches from the experimental groups were receiving zearalenone per os at the doses of 25 µg/kg b.w. and 50 µg/kg b.w., respectively for 100 d. The concentrations of zearalenone, progesterone, and 17β- oestradiol were analysed in weekly intervals. Zearalenone was noted as early as minute 30 and then during the whole experiment. High concentration of zearalenone (9.34 - 124.33 ng/mL.) was observed in weeks 6-9. The intoxication was accompanied by hormonal disturbances due to progesterone concentration (to 25-30 ng/mL) depending on zearalenone dose and by the increasing in 17β-oestradiol concentration (to 33 pg/ml). Hormonal disturbances of this kind are similar to those noted in different pathological conditions in the genital tract in bitches.
The research was aimed at determining the impact of the experimental oral administration of zearalenon on the uterus in bitches. The study was carried out on 9 sexually mature 1 to 3 year-old bitches that were divided into three groups: two experimental ones and a control group. The experimental animals were orally administered zearalenon at 25 μg/ kg BW (body weight) (group DI; n=3) and 50 μg/kg BW (group DII; n=3) throughout 100 days while the control bitches (group K; n=3) were administered placebo. After the period of 100 days, ovariohysterectomy was performed, and the uterine samples were submitted to histopathological and immunohistochemical examinations in order to determine the structure of the wall and the presence of PCNA antigen. In the experimental animals, the histopathological examinations revealed regressive lesions, such as degeneration and atrophia within the endometrium and myometrium, and local circulatory disorders, i.e. edema and extravasation. These lesions were not reported in the controls. In the bitches administered zearalenon, the tissues did not express any proliferative activity as determined by the presence of PCNA. It is assumed that, following the administration of zearalenon for 100 days orally to bitches, disruption of the structures within the wall of the uterus (i.e. degeneration, atrophy, edema, and extravasation within the endometrium and myometrium) develops. This research proves that zearalenon ingested by bitches may lead to dysfunction of the uterus and cause disruption of its structures.
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