Margarethe Brummermann

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Incubating and non-incubating Bantam hens were exposed to identical thoracic skin cooling to study the difference between their physiological responses with regard to thermoregulatory adaptation to incubation. Under resting conditions thoracic skin temperature (T ths) and metabolic heat production (M) were significantly higher in broody than in non-broody(More)
A homogeneous group of 8-week-old Pekin ducks was divided into two groups: saltwater (SW) ducks received salt water of gradually increasing salinity (200–600 mOsm·kg-1) from the 8th to 20th week of age; freshwater (FW) ducks were maintained on fresh water but otherwise treated identically. During the course of salt-adaptation SW ducks increased plasma(More)
In domestic ducks acclimated to 2% saltwater (SW ducks), chronic elevations of plasma osmolality and sodium concentration, and of the circulating levels of antidiretic hormone and angiotensin II indicate a trend towards dehydration when compared to ducks maintained on freshwater (FW ducks). Under steady state conditions of salt and water balance, with(More)
The avian ureteral contains from 3-15 mg/ml of protein, a large amount when compared to mammal urine (ca. 0.1 mg/ml). The avian urinary proteins range in molecular weight from 20--120 kDa and probably function to hold uric acid in a colloidal suspension preventing crystal formation. Porosity data for the glomerular filtration barrier of several mammals(More)
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