Ograniczanie wyników

Czasopisma help
Autorzy help
Lata help
Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 36

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  cykl rujowy
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
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.
The aim of this study was to assess the course of some parameters of non-specific immunity during the estrus cycle in bitches. Blood samples were collected from 28 healthy bitches at different stages (anestrus, proestrus, estrus, metestrus) of the estrus cycle. Nitroblue tetrazolium (NBT) reduction by blood neutrophils, phagocytic activity of neutrophils, proliferative response of blood lymphocytes to phytohemagglutynin, serum activity of lysozyme and ceruloplasmin, level of total protein and γ-globulin fraction were determined. The study showed that nitroblue tetrazolium (NBT) reduction by blood neutrophils, proliferative response of blood lymphocytes to phytohemagglutynin, serum activity of lysozyme and ceruloplasmin were significantly higher (p ≤ 0.01) in proestrus and estrus than in anestrus.
The aim of the present study was to establish: a) whether PGE₂ can permeate from venous and lymphatic vessels of the mesometrium to arterial blood and be retrograde transferred to the uterine horn during the porcine oestrous cycle; and b) whether PGE₂ can reach the ovary and oviduct by local destination transfer. The experiments were performed on days 9-10 (middle luteal phase), 13-14 (initiation of luteolysis), 16-18 (follicular phase) of the oestrous cycle. [³H]PGE₂ at a total dose of 5.5 × 10⁷ d.p.m. (49 ng) was infused into the most superficial layer of the myometrium under the serosa. The results demonstrated the permeation of PGE₂ from venous blood, uterine lymph and mesometrial tissues into arterial blood and its retrograde transfer into the uterine horn. The efficiency of retrograde transfer of prostaglandin to the uterine horn was high in all phases of the oestrous cycle, excluding the period of luteolysis. The local destination transfer of PGE₂ from the uterus to the ovary and oviduct was also demonstrated. The efficiency of local destination transfer of PGE₂ to the ovary was the highest in the middle luteal phase. The authors conclude that retrograde and local destination transfer of PGE₂ may enable effective access of this hormone to target organs and reduce its outflow with venous blood.
The use of assisted reproductive techniques in wild felids (Felidae) is currently the subject of research in many scientific centers all around the world. Despite the described success, the pregnancy rates obtained as the result of artificial insemination or embryo transfer are low and the litters are small, which is a limiting factor for wider use of reproduction biotechnology in wild felids. The lack of sufficient knowledge about endocrinology of individual members of the Felidae family and the inability to optimize female hormonal stimulation is given as a reason of failure by many authors. This paper presents methods of control of ovarian cycle in wild animals, characteristic features of reproduction of the family Felidae, and methods of the induction of estrus and ovulation. The paper also draws attention to endocrine disorders that occur in felines after hormonal stimulation and describes attempts to minimize them by prestimulatory down-regulation of ovarian activity.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.