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    Wyświetlanie 1-3 z 3
    Tytuł:
    Effect of 50 Hz magnetic field on chicken embryo development and course of hatching
    Autorzy:
    Lis, Marcin W.
    Powiązania:
    https://bibliotekanauki.pl/articles/93194.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowa Wyższa Szkoła Zawodowa w Tarnowie
    Tematy:
    chick embryo
    extra low frequency magnetic field
    hatch synchronization
    embryo development
    malformation
    zarodek pisklęcia
    pole magnetyczne o bardzo niskiej częstotliwości
    synchronizacja kreskowania
    rozwój zarodka
    zniekształcenie
    Opis:
    The effect of additional extremely low frequency (ELF) magnetic field (50 Hz) on the development of chick embryo was investigated. The experiment was carried out in three variants for induction values 15, 10 or 5 μT. Magnetic field (MF) in the experimental incubator was generated by a set of three Helmholtz coils. The following analyses were performed: embryopathological analysis; evaluation of the hatched chicks for quality; analysis of the course and synchronization of hatching Early embryo mortality in groups exposed to MF 10 and 15 μT compared to the control was higher by about 3 percentage points. Simultaneously, in these groups the hatching processes accelerated, but the quality of hatched chicks was much lower.
    Źródło:
    Science, Technology and Innovation; 2019, 5, 2; 44-49
    2544-9125
    Pojawia się w:
    Science, Technology and Innovation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of the antibacterial activity of chestnut (Castanea sativa) and cloves (Syzygium aromaticum) herbal extracts as an alternative to antibiotics use during post-hatching period of chicks
    Autorzy:
    Kędzia, Rafał
    Lis, Marcin W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402368.pdf
    Data publikacji:
    2020
    Wydawca:
    Państwowa Wyższa Szkoła Zawodowa w Tarnowie
    Tematy:
    antibiotic resistance
    herbal extract
    broiler chicken
    mortality
    odporność na antybiotyki
    ekstrakty ziół
    kurczęta brojlery
    śmiertelność
    Opis:
    Bacterial infections of newly hatched chicks are the most common cause of their death in the initial period of rearing. These infections are always treated with antibiotics. The aim of the study was to investigate the antimicrobial activity of herbal extracts of chestnut (Castanea sativa) and clove (Syzygium aromaticum) against bacterial infections i.e. Escherichia coli, Enterococcus faecalis, Staphylococcus aureus, Klebsiella pneumonice in comparison to antibiotics. The results of the microbiological analyses showed that the Castanea sativa and Syzygium aromaticum extracts had a slighter antibacterial activity in comparison to antibiotics. The diameter of zone inhibition of the culture’s growth of gram-negative bacteria (i.e. Escherichia coli and Klebsiella pneumoniae) and gram-positive bacteria (i.e. Staphylococcus aureus and Enterococcus faecalis) was 6–13 mm for these extracts in comparison to 15–30 mm for antibiotics. However, some bacterial strains presented full resistance to the selected antibiotics, e.g., wild strains of Enterobacteriaceae to amoxicillin or Staphylococcus aureus and Enterococcus faecalis to florfenicol, colistin, and doxycycline. In the second experiment, the effect of the herbal extract mixture added into drinking water on the growth and mortality of chicken broiler during the first rearing week was investigated. There was found that the use of herbal extracts improved the chickens’ body weight (157.4 g; P ≤ 0.008) and decreased mortality rate (2.4%) compared to the control group (144.1 g and 3.9%, respectively) but not to the group treated with antibiotic (161.5 and 0.6% respectively; P ≤ 0.009). In summary, the use of herbal extracts as a nutritional supplement for poultry seems to have a positive effect on weight gain of young birds, and to some extent reduce mortality in the first week of rearing.
    Źródło:
    Science, Technology and Innovation; 2020, 11, 4; 48-54
    2544-9125
    Pojawia się w:
    Science, Technology and Innovation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of ambient temperature on reproduction of the red-headed cricket (Gryllus assimilis)
    Autorzy:
    Hermansa, Natalia
    Kustra, Kamila
    Trela, Magdalena
    Lis, Marcin W.
    Powiązania:
    https://bibliotekanauki.pl/articles/29521114.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Tarnowska
    Tematy:
    insects
    insectariums
    environmental conditions
    owady
    insekty
    warunki środowiska
    Opis:
    Red-headed crickets were kept in glass insectariums equipped with drinkers, food containers and peat boxes for laying eggs. In the first stage of the experiment, the insects were divided into three groups, kept at 20°C, 25°C and 29°C, respectively. Three days after placing the crickets in the insectariums, the eggs were counted. In the second stage, the eggs (15 pcs.) were placed in boxes with peat in insectariums and exposed to the same temperatures as the females were kept at 20°C, 25°C and 29°C respectively, and the time in which the larvae hatch in each container was observed. It was found that the thermal conditions of the environment influence the number of eggs laid by female Gryllus assimilis and the length of the embryonic period in red-headed crickets. It is estimated that in the temperature range of 20–29°C, increasing the temperature by 1°C shortens the time needed to hatch the larvae from the eggs by 2 days.
    Źródło:
    Science, Technology and Innovation; 2022, 15, 1-2; 38-44
    2544-9125
    Pojawia się w:
    Science, Technology and Innovation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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