Salt Gland Secretion in Saline-Acclimated Chestnut Teal, and its Relevance to Release Programs

1982 ◽  
Vol 30 (3) ◽  
pp. 407 ◽  
Author(s):  
RV Baudinette ◽  
FI Norman ◽  
J Roberts
Keyword(s):  
Sodium Chloride ◽  
Fresh Water ◽  
Salt Water ◽  
Salt Gland ◽  
Gland Secretion ◽  
Lower Body ◽  
Salt Gland Secretion ◽  
Body Weights ◽  
Concentrate Urine ◽  
Nasal Glands

Chestnut teal were raised on increasing concentrations of sodium chloride in their drinking and bathing water, and the response to an intravenous salt load compared with that of animals maintained on fresh water. The salt-raised birds had lower body weights, larger nasal glands and higher plasma osmotic and sodium levels than control animals. After infusion of sodium chloride, the rate of salt gland secretion was similar in the two groups, but the salt-acclimated animals produced higher concentrations. These birds also were superior in their ability to concentrate urine. Although acclimation to salt water does induce changes in chestnut teal, they remain inferior to truly marine birds in their ability to handle salt. Their observed feeding in saline environments, and their release into such areas, probably rely on access to fresh water.

CONTROL OF THE SALT-SECRETING GLAND OF THE DUCK: I. OSMOTIC REGULATION

1967 ◽  
Vol 45 (6) ◽  
pp. 925-936 ◽  
Author(s):  
André Lanthier ◽  
Thomas Sandor
Keyword(s):  
Sodium Chloride ◽  
Sodium Bicarbonate ◽  
Intravenous Infusion ◽  
Electrolyte Concentration ◽  
Salt Gland ◽  
The Other ◽  
Gland Secretion ◽  
Osmotic Regulation ◽  
Domestic Duck ◽  
Salt Gland Secretion

The osmotic regulation of the salt gland secretion was studied in the domestic duck. The response to the intravenous infusion of 5% sodium chloride (850 meq Na per liter) was established in unanesthetized ducks. Sodium bicarbonate (892 meq Na/l) produced a salt gland secretion similar to that after 5% sodium chloride, except that it was accompanied by a moderate diuresis. Mannitol and sucrose had similar effects. On the other hand, urea, ammonium chloride, dextran, and meralluride produced only a small amount of salt-gland secretion of low electrolyte concentration. Antidiuretic doses of Pitressin did not induce secretion of the salt gland.

Dehydration elevates osmotic threshold for salt gland secretion in the duck

1979 ◽  
Vol 237 (5) ◽  
pp. R355-R359
Author(s):  
R. Kaul ◽  
H. T. Hammel
Keyword(s):  
Body Fluid ◽  
Salt Water ◽  
Extracellular Fluid ◽  
Plasma Osmolality ◽  
Salt Gland ◽  
Gland Secretion ◽  
Pekin Ducks ◽  
Salt Gland Secretion ◽  
Salt And Water Balance ◽  
Made In

Acute salt and water balance measurements were made in two conscious salt water-acclimated Pekin ducks at and above their osmotic threshold for salt gland secretion. Intravneous infusion of 1,000 mosmol/kg H2O NaCl at 0.350 ml/min increased plasma tonicity less than 0.5% and increased secretion from nearly zero to a rate matching the infusion. Continuous secretion at a similar submaximal rate was driven by 5,600 mosmol/kg H2O NaCl infused at 0.070 ml/min. Osmolality of secreted fluid was constant for any secretion rate, so that net water loss occurred when the concentration of infusate exceeded that of secreted fluid. Threshold plasma osmolality increased by 9 mosmol/kg H2O after the loss of 77 g water (3% body wt). Solutes were always secreted at the infusion rate, even when body fluid osmolality increased while body water decreased. We conclude that the salt gland controller is sensitive to more than just extracellular fluid (ECF) tonicity, and we suggest that elevation of the osmotic threshold may occur in response to decreased ECF volume.

Cation content of salt gland secretion and tears in the brolga, Grus rubicundus (Perry) (Aves : Gruidae)

1973 ◽  
Vol 21 (4) ◽  
pp. 515 ◽  
Author(s):  
MR Hughes ◽  
JG Blackman
Keyword(s):  
Salt Gland ◽  
Plasma Potassium ◽  
Sodium Concentration ◽  
Gland Secretion ◽  
Plasma Sodium ◽  
First Report ◽  
Gland Size ◽  
Cation Content ◽  
Salt Gland Secretion ◽  
Sodium And Potassium

This is the first report of salt gland secretion in cranes (Gruidae). The sodium and potassium concentrations of the plasma, tears, salt gland secretion, and urine of the brolga were determined. Tear sodium was equal to plasma sodium; tear plasma was four times as concentrated as plasma potassium. These values were normal for tears. The salt gland secretion sodium concentration (about 300 m-equivll) was lower than that reported for other NaC1-injected birds. This may be due to the diet, small gland size, or to insufficient stress. The salt gland secretion to plasma ratios were the same for sodium and potassium. This is unusual. The urine had a lower sodium concentration than the plasma.

Effect of volume expansion and veratrine on salt gland secretion in the goose

1977 ◽  
Vol 232 (5) ◽  
pp. R185-R189
Author(s):  
I. H. Zucker ◽  
C. Gilmore ◽  
J. Dietz ◽  
J. P. Gilmore
Keyword(s):  
Volume Expansion ◽  
Plasma Osmolality ◽  
Salt Gland ◽  
Sodium Concentration ◽  
Ringer Solution ◽  
Gland Secretion ◽  
Similar Increase ◽  
Volume Load ◽  
Salt Gland Secretion ◽  
Peripheral Receptor

The influence of acute intravascular volume expansion on salt gland secretion of conscious, adult geese was investigated. The intravenous administration of 5% dextran in Krebs-bicarbonate-Ringer solution in an amount equivalent to 30% of the estimated blood volume caused a transient but highly significant increase in salt gland secretion independent of changes in plasma osmolality or sodium concentration. Intravenous veratrine (60 microng) caused a similar increase in salt gland secretion only when administered after the volume load. Intravenous 5% NaCl always caused a prolonged and significant increase in salt gland secretion which was not potentiated by veratrine. Volume expansion and hypertonic saline caused a significant tachycardia while veratrine caused a significant bradycardia. It is concluded that a volume component may contribute to the initiation of salt gland secretion in the goose and that the peripheral receptor involved is most likely vascular in origin.

Properties of body fluids influencing salt gland secretion in Pekin ducks

1980 ◽  
Vol 239 (5) ◽  
pp. R489-R496
Author(s):  
H. T. Hammel ◽  
C. Simon-Oppermann ◽  
E. Simon
Keyword(s):  
Extracellular Fluid ◽  
Salt Gland ◽  
Colloid Osmotic Pressure ◽  
Threshold Concentration ◽  
Gland Secretion ◽  
Salt Glands ◽  
Control Solution ◽  
Pekin Ducks ◽  
Salt Gland Secretion ◽  
Before And After

Pekin ducks were reared and maintained on 620 mosmol NaCl/kg H2O to enhance the secretory capability of their salt glands. When a control solution of 1,000 mosmol NaCl/kg H2O was infused intravenously at 0.2, 0.4, or 0.6 ml/min for 60-90 min, the infused loads were secreted in approximately equal quantities, indicating that the amount of NaCl in the extracellular fluid (ECF) before and after each infusion did not change. Salt and water secreted in response to experimental infusions of hyposmotic saline or blood were less than the solute and water infused. Thus, ECF volume increased and the Na+ concentration decreased. Infusions of control solution followed these experimental infusions. The salt and water secreted again equaled the amounts infused, indicating that the threshold concentration of Na+ ([Na+]th) for salt gland secretion was decreased by the increase in ECF volume. When the colloid dextran was added to the control solution, its infusion increased the colloid osmotic pressure of the blood and decreased nasal secretion. Because dextran increased the intravascular volume while the interstitial fluid volume (ISFV) decreased, we conclude that the [Na+]th was inversely correlated with ISFV.

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