نتایج جستجو برای: gallus gallus
تعداد نتایج: 2262 فیلتر نتایج به سال:
In structured populations, competition for reproductive opportunities should be relaxed among related males. The few tests of this prediction often neglect the fact that sexual selection acts through multiple mechanisms, both before and after mating. We performed experiments to study the role of within-group male relatedness across pre- and postcopulatory mechanisms of sexual selection in socia...
One hundred and sixty chickens (Gallus gallus) from 31 small, private backyard flocks in the eastern part of the Czech Republic were examined for chewing lice (Phthiraptera: Amblycera, Ischnocera). At least one species of chewing lice was found on every bird examined. Seven species of chewing lice were identified in all; they had the following prevalences and mean intensities: Goniocotes gallin...
Gelatin is a mixture of protein obtained from animal parts (skin, bones, tendons, ligaments, and cartilages) by hydrolysis. market demand high especially in pharmaceutical, food, photographic, cosmetics industries based on its gelling, foaming, emulsifying properties. This preliminary study was focus chicken head feet gelatin extraction their characterization terms percentage yield physical pro...
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