Ograniczanie wyników

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

Znaleziono wyników: 56

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 3 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 3 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
Recognition of pregnancy was done in a flock of 104 Polish mountain ewes. The first examination was performed about 30 days after the rams were separated from the ewes, and then they were tested at 10 day intervals. A Toshiba ultrasonograph with a 5 MHz head was used for examina­tions. For comparison the ewes were tested for pregnancy with a Preg-Alert ultrasound apparatus produced by Renco- (USA). In the first examination conduced 30 days after the rams were separated, 68% of pregnancies were detected by the use of USG whereas only 29% of later confirmed pregnancies were detected by the ultrasound apparatus. During the second test performed 10 days later, 100% of pregnant ewes were confirmed by USG and 93% by the ultrasound apparatus. The results point to a great effec­tiveness of the USG method for detecting pregnancies in ewes at about 50 days after breeding.
The research objective was to demonstrate the course of Vitamin C synthesis process in geese from the 1st to the 56th day of life as compared to the growth of organ and body mass. The level of Vitamin C was determined according to Roe-Kuethers method in the glandular stomach, jejunum, kidneys and spleen. It was proved that in geese in their embrional stage, the greatest amount of Vitamin C was synthesized by the kidneys - 214.5 mg/kg tissue, then the spleen - 212.6 mg/kg, a slighty lesser amount by the glandular stomach - 154.0 mg/kg and by the jejunum - 148.5 mg/kg tissue. In the first 56 days of life, the glandular stomach synthesized about 220 mg/kg tissue Vitamin C. The body mass growth was higher than glandular stomach mass (51.64 times and 15.91 times). It should be stated that the glandular stomach in this time period provides less and less Vitamin C. Intensive renal, spleen and jejunum mass growth (175.4 times, 380 times and 59.94 times respectively) caused a considerable increase of the Vitamin synthesis by the whole organs.
The aim of the study was to evaluate the influence of large doses of exogenous gonadotrophins on ovarian follicular growth in goats. Folliculogenesis in twelve Polish White Goats was studied in the breeding season. In every goat synchronization of estrus was realized using FGA. In group 1 (6 goats), 1200 iu of PMSG was injected at the day of sponge withdrawal (day 17). In group 2 (6 goats), for four consecutive days from day 15, 40 iu, 30 iu, 20 iu, 10 iu of FSH was injected twice a day. Daily examinations of ovaries were performed from the day when sponges were inserted, to the ovulation in the second day after superovulation estrous cycle. The number of follicles growing during medication using FGA did not differ between groups, and did not differ from observations performed during natural estrous cycle. In ovulation wave of group 1 22.2 (± 3.92) of follicles were growing, and 21 (± 3.95) reached diameter of ³ 5 mm. In ovulation wave of group 2 20.2 (± 2.93) of follicles were growing, and 18.5 (± 2.07) reached a diameter of ³ 5 mm. The differences between groups were insignificant. The ovulation rate in group 1 was 13.2 (± 3.06), and was significantly lower (P £ 0.05) than in group 2, i.e. 17.5 (± 3.67). After ovulation in the animals of group 1, follicular cysts appeared and disturbed folliculogenesis of the next estrous cycle. In the first wave there were more follicles then in the natural cycle, but after the second wave recruitment was stopped. In the ovulation wave less follicles were growing than in the natural cycle, however the ovulation rate was typical. There were larger numbers of growing follicles in the first postovulatory wave in group 2, nevertheless there were no disturbances in the rest of the cycle.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 3 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.