Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl
Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 14

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
Wyszukiwano:
w słowach kluczowych:  Dromaius novaehollandiae
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
EN
Little information on emu incubation techniques has been published so far both in the Polish and foreign literature; hence this study, which is aimed to investigate effects of various levels of incubation relative humidity on the hatchability of emu eggs. Three levels of relative humidity (RH), 20, 25, and 30%, were applied to groups I, II, and III, respectively. The temperature 36.4°C was maintained constant in all the groups during the incubation. The poorest results were recorded in the group III with 30% relative humidity. Keeping lower humidity in the groups I and II resulted in improved hatchability, especially due to reduced percentage of crippled and weak chicks. It was found that humidity significantly influenced egg weight loss during incubation; lower relative humidity resulted in increased egg weight loss.
EN
The study involved 113 emu eggs, laid by 4–yr–old hens kept by a Canadian breeder in Ontario. Those eggs which the shells had been damaged during transport were used for chemical assays to determine dry matter, protein, and fat contents in the yolk. The egg weight and shape index were determined as well.
EN
The aim of the study was to assess an effect of incubation temperature (36.4, 36.7, and 37.1°C) on hatching performance of emu. The fewest dead embryos (13.7%) were found in group I with the lowest incubation temperature. Raising the temperature by 0.3°C and 0.7°C in, respectively, group II and III reduced the hatchability indices, primarily due to an increased rate (by approx. 12%) of dead embryos in both groups. Temperature significantly influenced the duration of incubation period, as well as duration of hatching. Incubation at the highest temperature took the shortest time (49.9 days), whereas that at the lowest temperature lasted longest (51.5 days). A reversed pattern was found in the case of hatching duration, which at the higher temperature expanded by 282 minutes in group II and by 406 minutes in group III, as compared with group I.
|
|
tom 22
|
nr 3
EN
In emus, the duration of the fertile period was measured following a single artificial insemination (AI) and investigated the effect of time of AI in the egg cycle on the duration of the fertile period. Semen was collected by artificial cloaca, pooled and used undiluted for AI within 30 minutes. For insemination, a female was followed until she assumed the voluntary crouch. A speculum was then inserted into the cloaca and an insemination straw introduced into the vagina to a depth of 1-2 cm, and semen deposited. Following a single insemination with 100, 200 or 400 million spermatozoa, female emus laid fertilized eggs for 10.0±0.4, 12.0±0.9, and 15.0±0.6 days. When 400 million spermatozoa were used for insemination on Day 1, 2 or 3 of the oviposition cycle, the duration of the fertile period appeared to change in a day-dependent manner. After AI on Day 1, female emus laid fertilized eggs for 15.8±1.1 days, after AI on Day 2 for 12.5±2.2 days, and after AI on Day 3 for 10.0±1.5 days. The results suggest that female emus need to be inseminated the day after oviposition to maximize the duration of their fertile period.
PL
Celem badań było określenie długości okresu zapładnialności jaj emu po sztucznym unasienieniu i wpływu czasu unasienienia na długość tego okresu. Nasienie pobierano za pomocą sztucznej pochwy I samice unasieniano nierozcieńczonym nasieniem w ciągu 30 minut. Unasieniania dokonywano za pomocą wziernika, po tym jak samica dobrowolnie usiadła i pozwoliła na dostęp do kloaki. Nasienie deponowano dopochwowo na głębokość 1-2 cm ze słomki inseminacyjnej osadzonej na strzykawce. Po jednokrotnym unasienieniu dawką 100, 200 czy 400 milionów plemników samice znosiły zapłodnione jaja odpowiednio przez okres 10±0,4, 12±0,9 i 15±0,6 dni. Po unasienieniu dawką 400 milionów plemników w 1, 2 czy 3 dniu cyklu jajowego, długość „okresu płodnego” wyniosła odpowiednio 15,8±1,1,12,5±2,2 i 10,0±1,5 dni. Wyniki sugerują, że aby uzyskać maksymalną długość okresu zapładnialności jaj emu w trakcie nieśności, unasienienia powinno się dokonywać w pierwszym dniu cyklu jajowego, to jest w dzień po zniesieniu jaja.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.