Circadian and ultradian rhythms of peripheral growth hormone concentrations in lactating dairy cows
To investigate possible circadian and ultradian periodicities for plasma growth hormone in lactating dairy cows, integrated 15-min blood samples taken sequentially over 48 hr from six cows were analyzed by radioimmunoassay. The cows were housed in an environmental chamber at 19 ± 0.5° C, 50% relativ...
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| Veröffentlicht in: | Domestic animal endocrinology 1995-07, Vol.12 (3), p.247-256 |
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| creator | Lefcourt, A.M. Bitman, J. Wood, D.L. Akers, R.M. |
| description | To investigate possible circadian and ultradian periodicities for plasma growth hormone in lactating dairy cows, integrated 15-min blood samples taken sequentially over 48 hr from six cows were analyzed by radioimmunoassay. The cows were housed in an environmental chamber at 19 ± 0.5° C, 50% relative humidity, and 16 hr of light and 8 hr of darkness (lights on at 0700 hr); fed daily at 0900 hr; and milked at 0800 and 2000 hr. Peripheral concentrations of growth hormone for all six cows exhibited sinusoidal circadian rhythms with average minima of 4.1 ng/ml at 1820 hr and maxima of 5.3 ng/ml at 0630 hr. Estimated periods of ultradian rhythms for individual cows by spectral analysis, peak identification, and fitting cosine functions using least squares were 71 to 83 min for all cows. No direct relationship between ultradian peaks and milking or feeding was apparent. In conclusion, a circadian rhythm and an ultradian rhythm with a period around 80 min are probably intrinsic to mechanisms regulating peripheral growth hormone concentrations in the lactating dairy cow. |
| doi_str_mv | 10.1016/0739-7240(95)00022-7 |
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The cows were housed in an environmental chamber at 19 ± 0.5° C, 50% relative humidity, and 16 hr of light and 8 hr of darkness (lights on at 0700 hr); fed daily at 0900 hr; and milked at 0800 and 2000 hr. Peripheral concentrations of growth hormone for all six cows exhibited sinusoidal circadian rhythms with average minima of 4.1 ng/ml at 1820 hr and maxima of 5.3 ng/ml at 0630 hr. Estimated periods of ultradian rhythms for individual cows by spectral analysis, peak identification, and fitting cosine functions using least squares were 71 to 83 min for all cows. No direct relationship between ultradian peaks and milking or feeding was apparent. In conclusion, a circadian rhythm and an ultradian rhythm with a period around 80 min are probably intrinsic to mechanisms regulating peripheral growth hormone concentrations in the lactating dairy cow.</description><identifier>ISSN: 0739-7240</identifier><identifier>EISSN: 1879-0054</identifier><identifier>DOI: 10.1016/0739-7240(95)00022-7</identifier><identifier>PMID: 7587168</identifier><language>eng</language><publisher>United States: Elsevier Inc</publisher><subject>Activity Cycles - physiology ; Animals ; BIOLOGICAL RHYTHMS ; BLOOD PLASMA ; Cattle - blood ; Cattle - physiology ; CIRCADIAN RHYTHM ; Circadian Rhythm - physiology ; DAIRY COWS ; Female ; Growth Hormone - blood ; HORMONAS ; HORMONE ; HORMONES ; LACTACION ; LACTATING FEMALES ; LACTATION ; Lactation - blood ; PERIODICIDAD ; PERIODICITE ; PERIODICITY ; PLASMA SANGUIN ; PLASMA SANGUINEO ; Radioimmunoassay ; RITMOS BIOLOGICOS ; RYTHME BIOLOGIQUE ; SECRECION ; SECRETION ; SOMATOTROPIN ; SOMATOTROPINA ; SOMATOTROPINE ; TEMPORAL VARIATION ; VACAS LECHERAS ; VACHE LAITIERE</subject><ispartof>Domestic animal endocrinology, 1995-07, Vol.12 (3), p.247-256</ispartof><rights>1995</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c442t-7f365369e01e17fa491bb90f36ca3b7faf3df6e96dcd96af83c2ad9e477adc753</citedby><cites>FETCH-LOGICAL-c442t-7f365369e01e17fa491bb90f36ca3b7faf3df6e96dcd96af83c2ad9e477adc753</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/0739-7240(95)00022-7$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>315,781,785,3551,27929,27930,46000</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/7587168$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Lefcourt, A.M.</creatorcontrib><creatorcontrib>Bitman, J.</creatorcontrib><creatorcontrib>Wood, D.L.</creatorcontrib><creatorcontrib>Akers, R.M.</creatorcontrib><title>Circadian and ultradian rhythms of peripheral growth hormone concentrations in lactating dairy cows</title><title>Domestic animal endocrinology</title><addtitle>Domest Anim Endocrinol</addtitle><description>To investigate possible circadian and ultradian periodicities for plasma growth hormone in lactating dairy cows, integrated 15-min blood samples taken sequentially over 48 hr from six cows were analyzed by radioimmunoassay. The cows were housed in an environmental chamber at 19 ± 0.5° C, 50% relative humidity, and 16 hr of light and 8 hr of darkness (lights on at 0700 hr); fed daily at 0900 hr; and milked at 0800 and 2000 hr. Peripheral concentrations of growth hormone for all six cows exhibited sinusoidal circadian rhythms with average minima of 4.1 ng/ml at 1820 hr and maxima of 5.3 ng/ml at 0630 hr. Estimated periods of ultradian rhythms for individual cows by spectral analysis, peak identification, and fitting cosine functions using least squares were 71 to 83 min for all cows. No direct relationship between ultradian peaks and milking or feeding was apparent. In conclusion, a circadian rhythm and an ultradian rhythm with a period around 80 min are probably intrinsic to mechanisms regulating peripheral growth hormone concentrations in the lactating dairy cow.</description><subject>Activity Cycles - physiology</subject><subject>Animals</subject><subject>BIOLOGICAL RHYTHMS</subject><subject>BLOOD PLASMA</subject><subject>Cattle - blood</subject><subject>Cattle - physiology</subject><subject>CIRCADIAN RHYTHM</subject><subject>Circadian Rhythm - physiology</subject><subject>DAIRY COWS</subject><subject>Female</subject><subject>Growth Hormone - blood</subject><subject>HORMONAS</subject><subject>HORMONE</subject><subject>HORMONES</subject><subject>LACTACION</subject><subject>LACTATING FEMALES</subject><subject>LACTATION</subject><subject>Lactation - blood</subject><subject>PERIODICIDAD</subject><subject>PERIODICITE</subject><subject>PERIODICITY</subject><subject>PLASMA SANGUIN</subject><subject>PLASMA SANGUINEO</subject><subject>Radioimmunoassay</subject><subject>RITMOS BIOLOGICOS</subject><subject>RYTHME BIOLOGIQUE</subject><subject>SECRECION</subject><subject>SECRETION</subject><subject>SOMATOTROPIN</subject><subject>SOMATOTROPINA</subject><subject>SOMATOTROPINE</subject><subject>TEMPORAL VARIATION</subject><subject>VACAS LECHERAS</subject><subject>VACHE LAITIERE</subject><issn>0739-7240</issn><issn>1879-0054</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1995</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNp9kE1rGzEQhkVpSdy0f6AkoFNpD9tI-6FZXQrF9AsCPTQ5C1kaeRV2JVda1_jfV86aHHsaZt73nRkeQq45-8QZF7cMGllB3bIPsvvIGKvrCl6QFe9BVox17UuyerZcktc5PxYTlOgFuYCuBy76FTFrn4y2Xgeqg6X7cU5Ll4bjPEyZRkd3mPxuwKRHuk3xMA90iGmKAamJwWAokdnHkKkPdNRmLl3YUqt9OhbHIb8hr5weM7491yvy8O3r_fpHdffr-8_1l7vKtG09V-Aa0TVCIuPIwelW8s1GsjI1utmUgWusEyiFNVYK7frG1NpKbAG0NdA1V-T9sneX4p895llNPhscRx0w7rMCAAZMnIztYjQp5pzQqV3yk05HxZk6sVUncOoETslOPbFVUGI35_37zYT2OXSGWfR3i-50VHqbfFYPv6Vgfff03OdFxELgr8eksvFY8Fmf0MzKRv__6_8A-DuTLA</recordid><startdate>19950701</startdate><enddate>19950701</enddate><creator>Lefcourt, A.M.</creator><creator>Bitman, J.</creator><creator>Wood, D.L.</creator><creator>Akers, R.M.</creator><general>Elsevier Inc</general><scope>FBQ</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>19950701</creationdate><title>Circadian and ultradian rhythms of peripheral growth hormone concentrations in lactating dairy cows</title><author>Lefcourt, A.M. ; Bitman, J. ; Wood, D.L. ; Akers, R.M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c442t-7f365369e01e17fa491bb90f36ca3b7faf3df6e96dcd96af83c2ad9e477adc753</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1995</creationdate><topic>Activity Cycles - physiology</topic><topic>Animals</topic><topic>BIOLOGICAL RHYTHMS</topic><topic>BLOOD PLASMA</topic><topic>Cattle - blood</topic><topic>Cattle - physiology</topic><topic>CIRCADIAN RHYTHM</topic><topic>Circadian Rhythm - physiology</topic><topic>DAIRY COWS</topic><topic>Female</topic><topic>Growth Hormone - blood</topic><topic>HORMONAS</topic><topic>HORMONE</topic><topic>HORMONES</topic><topic>LACTACION</topic><topic>LACTATING FEMALES</topic><topic>LACTATION</topic><topic>Lactation - blood</topic><topic>PERIODICIDAD</topic><topic>PERIODICITE</topic><topic>PERIODICITY</topic><topic>PLASMA SANGUIN</topic><topic>PLASMA SANGUINEO</topic><topic>Radioimmunoassay</topic><topic>RITMOS BIOLOGICOS</topic><topic>RYTHME BIOLOGIQUE</topic><topic>SECRECION</topic><topic>SECRETION</topic><topic>SOMATOTROPIN</topic><topic>SOMATOTROPINA</topic><topic>SOMATOTROPINE</topic><topic>TEMPORAL VARIATION</topic><topic>VACAS LECHERAS</topic><topic>VACHE LAITIERE</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Lefcourt, A.M.</creatorcontrib><creatorcontrib>Bitman, J.</creatorcontrib><creatorcontrib>Wood, D.L.</creatorcontrib><creatorcontrib>Akers, R.M.</creatorcontrib><collection>AGRIS</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Domestic animal endocrinology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Lefcourt, A.M.</au><au>Bitman, J.</au><au>Wood, D.L.</au><au>Akers, R.M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Circadian and ultradian rhythms of peripheral growth hormone concentrations in lactating dairy cows</atitle><jtitle>Domestic animal endocrinology</jtitle><addtitle>Domest Anim Endocrinol</addtitle><date>1995-07-01</date><risdate>1995</risdate><volume>12</volume><issue>3</issue><spage>247</spage><epage>256</epage><pages>247-256</pages><issn>0739-7240</issn><eissn>1879-0054</eissn><abstract>To investigate possible circadian and ultradian periodicities for plasma growth hormone in lactating dairy cows, integrated 15-min blood samples taken sequentially over 48 hr from six cows were analyzed by radioimmunoassay. The cows were housed in an environmental chamber at 19 ± 0.5° C, 50% relative humidity, and 16 hr of light and 8 hr of darkness (lights on at 0700 hr); fed daily at 0900 hr; and milked at 0800 and 2000 hr. Peripheral concentrations of growth hormone for all six cows exhibited sinusoidal circadian rhythms with average minima of 4.1 ng/ml at 1820 hr and maxima of 5.3 ng/ml at 0630 hr. Estimated periods of ultradian rhythms for individual cows by spectral analysis, peak identification, and fitting cosine functions using least squares were 71 to 83 min for all cows. No direct relationship between ultradian peaks and milking or feeding was apparent. In conclusion, a circadian rhythm and an ultradian rhythm with a period around 80 min are probably intrinsic to mechanisms regulating peripheral growth hormone concentrations in the lactating dairy cow.</abstract><cop>United States</cop><pub>Elsevier Inc</pub><pmid>7587168</pmid><doi>10.1016/0739-7240(95)00022-7</doi><tpages>10</tpages></addata></record> |
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| subjects | Activity Cycles - physiology Animals BIOLOGICAL RHYTHMS BLOOD PLASMA Cattle - blood Cattle - physiology CIRCADIAN RHYTHM Circadian Rhythm - physiology DAIRY COWS Female Growth Hormone - blood HORMONAS HORMONE HORMONES LACTACION LACTATING FEMALES LACTATION Lactation - blood PERIODICIDAD PERIODICITE PERIODICITY PLASMA SANGUIN PLASMA SANGUINEO Radioimmunoassay RITMOS BIOLOGICOS RYTHME BIOLOGIQUE SECRECION SECRETION SOMATOTROPIN SOMATOTROPINA SOMATOTROPINE TEMPORAL VARIATION VACAS LECHERAS VACHE LAITIERE |
| title | Circadian and ultradian rhythms of peripheral growth hormone concentrations in lactating dairy cows |
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