The Hungarian Partridge in Wisconsin

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Abstract
The ecology and life history of the Hungarian partridge (Perdix perdix) in Wisconsin were studied for 6 yrs. on a 50-sq. mi. tract in Jefferson Co. An attempt to manage (increase densities) the species failed. Causes of low densities were traced to the summer period by a climographic study. A comparison of nesting frequency and hay-mowing showed that hay-mowing during 6 years coincided with the peak of hatching. 435 nests were studied as to location, construction, egg laying, incubation, and success of hatching. A dummy nest study was made to illustrate types of egg predation. A key (with illustrations) to the age of embryos is worked out which describes the physical changes of the growing embryo. A similar key (without illustrations) is given for partridge chicks through 13 weeks old. Weight growth of several groups of pen-reared birds is compared. Secondary and tertiary sex ratios are compared. Photomierographic material is used to sex birds as early as 7 days. Partridge pterylography is worked out. Results are given of behavior studies made with penned chicks and a winter food selection expt. carried on with 9 adult partridges.

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