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Parasites, morphology, and blood characters in male Red Jungle Fowl during development

Article Abstract:

The intestinal nematode Ascaridia galli was employed as an experimental treatment for young male Red Jungle Fowl to study the influence of this parasite on the growth and development through sexual maturity. The differences between parasitized and unparasitized males lasted for five months of age through sexual maturity. Findings indicate that the effect of parasites on male secondary sexual characteristics does not necessarily involve a change in circulating levels of testosterone.

Testosterone, Nematoda, Nematodes, Jungle fowl

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Food intake, weight changes and egg production in captive Red Grouse before and during laying: effects of the parasitic nematode Trichostrongylus tenuis

Article Abstract:

Parasitism by the nematode Trichostrongylus tenuis has a lower impact on egg production in laying captive Red Grouse, than food intake or weight loss during laying, even though grouse are income breeders. Hens infected at the onset of laying lose significantly more weight while and at the end of laying. Also, they are 13% lighter than other birds. The exact timing of the resumed development of previously arrested worm larvae determines their degree of effect on egg production.

Behavior, Body weight, Birds, Bird eggs, Bird nests, Willow ptarmigan

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A test of whether economy or nutrition determines fecal sac ingestion in nesting corvids

Article Abstract:

Assessment of the behavioral data of nesting Florida Scrub Jays and American Crows revealed the parent birds in both species to be consumers of their nestling's fecal sacs to satisfy their nutrition and energy requirements. In both species, females consumed more sacs than their mates as they required more energy.

Food and nutrition, Feces, Crows (Birds), Jays

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