Yazar "Yetisir, R" seçeneğine göre listele

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    Effects of different hatcher temperatures on hatching traits of broiler embryos during the last five days of incubation
    (SOUTH AFRICAN JOURNAL OF ANIMAL SCIENCES, 2004) Yildirim, I; Yetisir, R
    This study deals with the effects of different hatcher temperatures oil hatching traits in modern commercial broiler eggs during the last five days Of incubation. The hatching eggs were obtained from a 52-wk old (Ross 308) flock. All eggs were distributed randomly into One incubator and incubated for 17 d using uniform conditions (37.6 +/- 0.5 degreesC and 58% relative humidity). At the start of 18(th) days of incubation, the eggs were randomly distributed to four experimental hatching cabinets. The temperatures were set in the cabinets at 36.1, 37.2, 38.3 and 39.4 degreesC from 17 d of incubation until hatch. Hatching time, hatchability, age of mortality and the incidence of embryo malpositions were recorded as percentage of fertile eggs. The highest mean embryonic heat production or eggshell surface temperature Occurred in the hatching cabinets operated at 39.9 degreesC and lowest at 36.1 degreesC. Eggs incubated at 37.2 degreesC and 38.3 degreesC had a significantly higher hatchability than the other treatment groups. High embryo mortality at the late term stage of development was recorded at low (36.1 degreesC) and very high temperatures (39.9 degreesC). No significant difference in the incidence of malpositions was observed among the groups. These findings revealed that hatchability might be improved if incubation temperatures of 37.2 degreesC to 38.3 degreesC are used during last five days of incubation. The results indicate that the modern hatching broiler egg shows almost similar pattern as past generations for heat production and temperature in hatchers during the last five days of incubation. In other words, in spite of genetic improvements in the modern broilers, the incubation conditions and techniques remained largely unchanged.
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    Inhibitory effect of pollen and propolis extracts
    (WILEY-V C H VERLAG GMBH, 2004) Ozcan, M; Unver, A; Ceylan, DA; Yetisir, R
    Bee pollen and propolis were collected from Apis mellifera colonies in five regions of Turkey. The antifungal properties of methanol extracts of pollen and propolis (2% and 5% concentrations) were determined on Alternaria alternata and Fusarium oxysporium f sp. melonis. The least active concentration towards the tested fungi was 2% concentration of both extracts. The inhibitory effect of all propolis extracts on growth of F. oxysporium and A. alternata were generally higher when compared with pollen extracts. The growth of A. alternata and F oxysporium were not affected at both concentrations of pollens. However, F oxysporium against propolis extracts was more sensitive than A. alternata (P < 0.01). None of the pollen extracts tested completely inhibited mycelial growth of fungi used in our experiment. Percent inhibition of both pollen concentrations against A. alternata and F. oxysporium was lower than 50%. However, both concentrations of Alanya and Beysehir propolis extracts were 100% effective on mycelial growth of F oxysporium until the 7(th) day of incubation (P < 0.01). 2% Alanya and Beysehir pollen extracts completely stimulated mycelial growth of F oxysporium on the 7(th) day of incubation. Both concentrations of propolis extract showed more than 50% inhibition against F. oxysporium. It is suggested that high concentrations of propolis extract could be used as an antifungal agent against tested fungi.
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    The use of oregano (Origanum vulgare L) essential oil as alternative hatching egg disinfectant versus formaldehyde fumigation in quails (Cotumix coturnix japonica) eggs
    (ECOLE NATIONALE VETERINAIRE TOULOUSE, 2003) Yildirim, I; Ozsan, M; Yetisir, R
    The present study examined the effectiveness of Oregano (Origanum vulgare L) (OV) essential oil versus formaldehyde fumigation (FF) to disinfect quail (Coturnix japonica) hatching eggshell surface and maintain hatching results. There were found significant differences between OV and FF in the hatchability of fertile eggs (P < 0.05). The total embryo mortality (TEM) was lower in OV group compared to FF group (P < 0.05). The treatment groups did not effect on eggshell conductance and eggshell conductance constant. Following OV application, total bacteria population significantly (P < 0.01) decreased compared with control (CON) and FF groups. These results demonstrated that the OV could be regarded as probable alternative hatching egg disinfectant versus FF without adversely affecting quail hatching eggs.