CLOACAL STORAGE OF URINE IN ROOSTER

1. 1. The osmotic and ionic composition of the contents of the cloaca and large intestine of roosters was measured during dehydration and during salt and water loading. The urine moved from the urodeum retrogradely into the coprodeum and large intestine during all three types of osmotic stress, and the coprodeum and large intestine were therefore exposed to urine-feces contents with osmotic activities from 60 to 600 mOs and from 200 to 400 mOs respectively. 2. 2. The retrograde movement did not result in any difference in maximal and minimal osmotic and ionic composition between normally voided urine that had been stored in the intestine and cloaca and urine collected directly from the ureters during the three types of osmotic stress. 3. 3. During dehydration a limited resorption of NaCl and water was suggested by comparison of the cloacal output of NaCl and water with that of roosters in which the urine was collected from ureteral funnels. © 1968.