Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 13

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  nasilenie objawow
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
The study investigated the relationship between estrus intensity and conception rates in dairy cows and heifers as well as between the level of physical constitution and conception rates in cows measured on the day of artificial insemination (AI). Females were submitted for AI after confirming standing estrus, and just prior to insemination the estrus intensity was investigated and classified as strong if three out of four factors were detected i.e. standing, vaginal mucus discharge, high uterine tone or presence of follicles in the ovaries; otherwise the estrus intensity was classified as weak. In the cow’s group (n=48) only those exhibiting estrus between 50 and 100 days following delivery were investigated and only heifers (n=42) that were approximately 18 months old were inseminated. No drugs were administrated for oestrus synchronisation. The study indicated that oestrus intensity had no effect on conception rates in cows (58% vs. 45% cows exhibiting strong and weak oestrus respectively were pregnant) but oestrus intensity did affect the conception rates in heifers (78% vs. 47% heifers exhibiting strong and weak oestrus respectively were pregnant, p<0.05). The physical constitution level measured on the day of AI had no effect on conception rates and was similar in both pregnant and non pregnant cows (3.20 ± 0.18 and 3.31 ± 0.33 respectively).
A field experiment performed in 2008 and 2009 autumn seasons in Southern Poland (Lower Silesia) using hybrid winter oilseed rape cultivar PR46W10 (Pioneer Hi-Bred) proved the significant effect of fungicide spraying time on the incidence and severity of symptoms caused by fungal pathogens Leptosphaeria maculans and L. biglobosa. The disease incidence and severity were the lowest (6.7%) when the fungicide (Capitan 250 EW, flusilazole 250 g/l) was applied in the time following mass ascospore release. The population of the pathogens greatly differed between years: in the autumn of 2008 L. maculans dominated (92%) over L. biglobosa, whereas in 2009 it was the opposite, and L. maculans was re-isolated from 7% symptoms only. Summer and early autumn of 2008 was cooler and wetter as compared to the same period in 2009. The results show that the introduction of decision support systems may cause more efficient protection of oilseed rape against stem canker of brassicas, one of the most important diseases of oilseed rape worldwide.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 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.