Salt‐gland secretion and blood flow in the goose

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Abstract
1. Salt‐gland blood flow in the domestic goose has been measured using a combination of Sapirstein's indicator fractionation technique for organ blood flow and Fegler's thermodilution method for cardiac output.2. Nasal salt secretion was induced by giving 0·5 M‐NaCl or 0·154 M‐NaCl I.V. or by giving artificial sea water by stomach tube into the proventriculus.3. During secretion, salt‐gland blood flow increased from 82·7 ± 21·9 ml./100 g tissue. min to as high as 2179 ml./100 g. min (mean 1209 ± 140).4. The rate of secretion in response to salt loading was very variable and was not correlated with the rate of blood flow.5. From the data obtained, it could be calculated that the median values for the percentage extraction of ions from the arterial plasma were Na 15%, K 35%, Cl 21% and water 5·8%.6. Atropine abolished secretion but not the increase in blood flow produced by salt loading.7. Unilateral complete denervation abolished secretion from and the increase in blood flow through the operated but not the control gland.8. Anaesthesia, induced by pentobarbitone sodium, almost completely blocked secretion and the increase in blood flow in the salt‐gland in response to salt loading.9. In geese given 0·5 or 0·154 M‐NaCl I.V. a positive, significant correlation was found between the total amount of nasal secretion collected over 30 min and the concentrations of Na and Cl in the nasal fluid. However, when the time course of secretion was followed in any one bird, the rate of secretion was inversely related to the concentrations of Na and Cl.10. Harderian gland blood flow was not affected by salt loading.