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Article: Influences of sex and saline intake on diurnal changes in plasma melatonin and osmoregulatory hormones of Pekin ducks (Anas platyrhynchos)

TitleInfluences of sex and saline intake on diurnal changes in plasma melatonin and osmoregulatory hormones of Pekin ducks (Anas platyrhynchos)
Authors
KeywordsAldosterone
Angiotensin II
Arginine vasotocin
Circadian rhythm
Duck
Melatonin
Plasma osmolality
Prolactin
Saline
Sex
Issue Date2006
PublisherAcademic Press. The Journal's web site is located at http://www.elsevier.com/locate/ygcen
Citation
General And Comparative Endocrinology, 2006, v. 149 n. 2, p. 124-133 How to Cite?
AbstractMelatonin (MT) inhibits salt gland secretion of Pekin ducks [Ching, A.C.T., Hughes, M.R., Poon, A.M.S., Pang, S.F., 1999. Melatonin receptors and melatonin inhibition of duck salt gland secretion. Gen. Comp. Endocrinol. 116, 229-240]. The present study examined simultaneous diurnal changes in plasma concentrations of MT and four osmoregulatory hormones of Pekin ducks to assess the possible interactions among these hormones that might contribute to inhibition of extrarenal salt secretion. The study compared diurnal changes in freshwater (FW) and saline-acclimated (SA) male and female ducks. We hypothesized plasma concentrations of osmoregulatory hormones: (1) differ between sexes (partially accepted); (2) vary diurnally (accepted, influenced by sex and treatment); (3) are correlated with MT (partially accepted); and their diurnal variation is affected by (4) sex (partially accepted); and (5) saline acclimation (partially accepted). We compared body mass, plasma osmolality (Osmpl), plasma volume, concentrations of plasma ions, and arginine vasotocin (AVT), angiotensin II (AII), prolactin, (PRL), and aldosterone (ALDO), in relation to plasma melatonin (MT). At night body mass increased in FW ducks and decreased in SA ducks. This likely reflects the higher plasma PRL concentration of female ducks and its middark increase only in SA ducks. Plasma volume increased at night in all but FW males. Plasma sodium and osmolality were higher in SA ducks and did not vary diurnally in either FW or SA ducks. Midday MT did not differ between males and females or between FW and SA ducks; at middark, all ducks, except FW females, increased MT. Midday AVT was higher in SA ducks. Only FW ducks increased AVT at middark. Changes in AVT and MT were positively correlated in males and negatively correlated in females. Males had higher AII and, at night, AII increased in SA ducks and decreased in FW ducks. AVT and AII were negatively correlated. ALDO was highly correlated with AII and unaffected by sex, saline, or time. At night, only AVT was elevated in FW ducks, while MT, AII, and PRL were elevated in SA ducks. FW and SA ducks appear to follow different, but equally effective, hormonal strategies to maintain osmotic homeostasis at night. We conclude that the effect of MT on salt gland secretion is probably a direct effect. These may be influenced by gender. © 2006 Elsevier Inc. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/81364
ISSN
2015 Impact Factor: 2.667
2015 SCImago Journal Rankings: 1.245
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorHughes, MRen_HK
dc.contributor.authorBennett, DCen_HK
dc.contributor.authorGray, DAen_HK
dc.contributor.authorSharp, PJen_HK
dc.contributor.authorPoon, AMSen_HK
dc.date.accessioned2010-09-06T08:16:47Z-
dc.date.available2010-09-06T08:16:47Z-
dc.date.issued2006en_HK
dc.identifier.citationGeneral And Comparative Endocrinology, 2006, v. 149 n. 2, p. 124-133en_HK
dc.identifier.issn0016-6480en_HK
dc.identifier.urihttp://hdl.handle.net/10722/81364-
dc.description.abstractMelatonin (MT) inhibits salt gland secretion of Pekin ducks [Ching, A.C.T., Hughes, M.R., Poon, A.M.S., Pang, S.F., 1999. Melatonin receptors and melatonin inhibition of duck salt gland secretion. Gen. Comp. Endocrinol. 116, 229-240]. The present study examined simultaneous diurnal changes in plasma concentrations of MT and four osmoregulatory hormones of Pekin ducks to assess the possible interactions among these hormones that might contribute to inhibition of extrarenal salt secretion. The study compared diurnal changes in freshwater (FW) and saline-acclimated (SA) male and female ducks. We hypothesized plasma concentrations of osmoregulatory hormones: (1) differ between sexes (partially accepted); (2) vary diurnally (accepted, influenced by sex and treatment); (3) are correlated with MT (partially accepted); and their diurnal variation is affected by (4) sex (partially accepted); and (5) saline acclimation (partially accepted). We compared body mass, plasma osmolality (Osmpl), plasma volume, concentrations of plasma ions, and arginine vasotocin (AVT), angiotensin II (AII), prolactin, (PRL), and aldosterone (ALDO), in relation to plasma melatonin (MT). At night body mass increased in FW ducks and decreased in SA ducks. This likely reflects the higher plasma PRL concentration of female ducks and its middark increase only in SA ducks. Plasma volume increased at night in all but FW males. Plasma sodium and osmolality were higher in SA ducks and did not vary diurnally in either FW or SA ducks. Midday MT did not differ between males and females or between FW and SA ducks; at middark, all ducks, except FW females, increased MT. Midday AVT was higher in SA ducks. Only FW ducks increased AVT at middark. Changes in AVT and MT were positively correlated in males and negatively correlated in females. Males had higher AII and, at night, AII increased in SA ducks and decreased in FW ducks. AVT and AII were negatively correlated. ALDO was highly correlated with AII and unaffected by sex, saline, or time. At night, only AVT was elevated in FW ducks, while MT, AII, and PRL were elevated in SA ducks. FW and SA ducks appear to follow different, but equally effective, hormonal strategies to maintain osmotic homeostasis at night. We conclude that the effect of MT on salt gland secretion is probably a direct effect. These may be influenced by gender. © 2006 Elsevier Inc. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherAcademic Press. The Journal's web site is located at http://www.elsevier.com/locate/ygcenen_HK
dc.relation.ispartofGeneral and Comparative Endocrinologyen_HK
dc.subjectAldosteroneen_HK
dc.subjectAngiotensin IIen_HK
dc.subjectArginine vasotocinen_HK
dc.subjectCircadian rhythmen_HK
dc.subjectDucken_HK
dc.subjectMelatoninen_HK
dc.subjectPlasma osmolalityen_HK
dc.subjectProlactinen_HK
dc.subjectSalineen_HK
dc.subjectSexen_HK
dc.titleInfluences of sex and saline intake on diurnal changes in plasma melatonin and osmoregulatory hormones of Pekin ducks (Anas platyrhynchos)en_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0016-6480&volume=149&spage=205&epage=214&date=2006&atitle=Influences+of+sex+and+saline+intake+on+diurnal+changes+in+plasma+melatonin+and+osmoregulatory+hormones+of+Pekin+ducks+(Anas+platyrhynchos)en_HK
dc.identifier.emailPoon, AMS: amspoon@hkucc.hku.hken_HK
dc.identifier.authorityPoon, AMS=rp00354en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.ygcen.2006.04.001en_HK
dc.identifier.pmid16938296-
dc.identifier.scopuseid_2-s2.0-33749235667en_HK
dc.identifier.hkuros123911en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33749235667&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume149en_HK
dc.identifier.issue2en_HK
dc.identifier.spage124en_HK
dc.identifier.epage133en_HK
dc.identifier.isiWOS:000241237600002-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridHughes, MR=7402467508en_HK
dc.identifier.scopusauthoridBennett, DC=35119945400en_HK
dc.identifier.scopusauthoridGray, DA=7403493921en_HK
dc.identifier.scopusauthoridSharp, PJ=7402934924en_HK
dc.identifier.scopusauthoridPoon, AMS=7103068868en_HK

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