Gonadotrophin secretion in prepubertal bull calves born in spring and autumn
The reproductive development of bull calves born in spring and autumn was compared. Mean serum LH concentrations in calves born in spring increased from week 4 to week 18 after birth and decreased by week 24. In bull calves born in autumn, mean LH concentrations increased from week 4 to week 8 after...
Gespeichert in:
| Veröffentlicht in: | Journal of reproduction & fertility 2000-09, Vol.120 (1), p.159-167 |
|---|---|
| Hauptverfasser: | , , , , , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| container_end_page | 167 |
|---|---|
| container_issue | 1 |
| container_start_page | 159 |
| container_title | Journal of reproduction & fertility |
| container_volume | 120 |
| creator | ARAVINDAKSHAN, J. P HONARAMOOZ, A BARTLEWSKI, P. M BEARD, A. P PIERSON, R. R RAWLINGS, N. C |
| description | The reproductive development of bull calves born in spring and autumn was compared. Mean serum LH concentrations in calves
born in spring increased from week 4 to week 18 after birth and decreased by week 24. In bull calves born in autumn, mean
LH concentrations increased from week 4 to week 8 after birth and remained steady until week 44. LH pulse amplitude was lower
in bull calves born in autumn than in calves born in spring until week 24 of age (P < 0.05). There was a negative correlation
between LH pulse frequency at week 12 after birth and age at puberty in bull calves, irrespective of season of birth, and
LH pulse frequency at week 18 also tended to correlate negatively with age at puberty. Mean serum FSH concentrations, age
at puberty, bodyweight, scrotal circumference, testes, prostate and vesicular gland dimensions, and ultrasonographic grey
scale (pixel units) were not significantly different between bull calves born in autumn and spring. However, age and body-weight
at puberty were more variable for bull calves born in autumn (P < 0.05). In a second study, bull calves born in spring received
either a melatonin or sham implant immediately after birth and at weeks 6 and 11 after birth. Implants were removed at week
20. Mean LH concentrations, LH pulse frequency and amplitude, mean FSH concentrations and age at puberty did not differ between
the two groups. No significant differences between groups in the growth and pixel units of the reproductive tract were observed
by ultrasonography. In conclusion, although there were differences in the pattern of LH secretion in the prepubertal period
between bull calves born in autumn and spring, the postnatal changes in gonadotrophin secretion were not disrupted by melatonin
treatment in bull calves born in spring. Reproductive tract development did not differ between calves born in spring and autumn
but age at puberty was more variable in bull calves born in autumn. LH pulse frequency during the early prepubertal period
may be a vital factor in determining the age of bull calves at puberty. |
| doi_str_mv | 10.1530/jrf.0.1200159 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_crossref_primary_10_1530_jrf_0_1200159</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>72301987</sourcerecordid><originalsourceid>FETCH-LOGICAL-c375t-4649f4deeb5b356aae398fbb47cd2639d55be9327cdbaa697967634d58c1fa313</originalsourceid><addsrcrecordid>eNp1kMFLwzAUh4Mobk6PXqUgeOtMmjRpjiI6hYEXPZckfd0yuqQmreJ_b-aGnjy93498vBc-hC4JnpOS4ttNaOcpFhiTUh6hKRGM5KKS8jhlJnBOeMEn6CzGzQ6pBD9FE0Iw5qlM0XLhnWr8EHy_ti6LYAIM1rsslT5AP2oIg-oyPXZdZlT3ATHTPvy8xz5Yt8qUazI1DuPWnaOTVnURLg5zht4eH17vn_Lly-L5_m6ZGyrKIWecyZY1ALrUtORKAZVVqzUTpik4lU1ZapC0SFUrxaWQXHDKmrIypFWU0Bm62e_tg38fIQ711kYDXacc-DHWoqCYyEokMN-DJvgYA7R1-vJWha-a4Hqnr0766hT3-hJ_dVg86i00f_TBVwKuD4CKyUYblDM2_nIVqSijiWJ7am1X608boNbWR2PBDba1Rv1z_Rvpy4nb</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>72301987</pqid></control><display><type>article</type><title>Gonadotrophin secretion in prepubertal bull calves born in spring and autumn</title><source>MEDLINE</source><source>Alma/SFX Local Collection</source><creator>ARAVINDAKSHAN, J. P ; HONARAMOOZ, A ; BARTLEWSKI, P. M ; BEARD, A. P ; PIERSON, R. R ; RAWLINGS, N. C</creator><creatorcontrib>ARAVINDAKSHAN, J. P ; HONARAMOOZ, A ; BARTLEWSKI, P. M ; BEARD, A. P ; PIERSON, R. R ; RAWLINGS, N. C</creatorcontrib><description>The reproductive development of bull calves born in spring and autumn was compared. Mean serum LH concentrations in calves
born in spring increased from week 4 to week 18 after birth and decreased by week 24. In bull calves born in autumn, mean
LH concentrations increased from week 4 to week 8 after birth and remained steady until week 44. LH pulse amplitude was lower
in bull calves born in autumn than in calves born in spring until week 24 of age (P < 0.05). There was a negative correlation
between LH pulse frequency at week 12 after birth and age at puberty in bull calves, irrespective of season of birth, and
LH pulse frequency at week 18 also tended to correlate negatively with age at puberty. Mean serum FSH concentrations, age
at puberty, bodyweight, scrotal circumference, testes, prostate and vesicular gland dimensions, and ultrasonographic grey
scale (pixel units) were not significantly different between bull calves born in autumn and spring. However, age and body-weight
at puberty were more variable for bull calves born in autumn (P < 0.05). In a second study, bull calves born in spring received
either a melatonin or sham implant immediately after birth and at weeks 6 and 11 after birth. Implants were removed at week
20. Mean LH concentrations, LH pulse frequency and amplitude, mean FSH concentrations and age at puberty did not differ between
the two groups. No significant differences between groups in the growth and pixel units of the reproductive tract were observed
by ultrasonography. In conclusion, although there were differences in the pattern of LH secretion in the prepubertal period
between bull calves born in autumn and spring, the postnatal changes in gonadotrophin secretion were not disrupted by melatonin
treatment in bull calves born in spring. Reproductive tract development did not differ between calves born in spring and autumn
but age at puberty was more variable in bull calves born in autumn. LH pulse frequency during the early prepubertal period
may be a vital factor in determining the age of bull calves at puberty.</description><identifier>ISSN: 1470-1626</identifier><identifier>ISSN: 0022-4251</identifier><identifier>EISSN: 1741-7899</identifier><identifier>DOI: 10.1530/jrf.0.1200159</identifier><identifier>PMID: 11006158</identifier><identifier>CODEN: JRPFA4</identifier><language>eng</language><publisher>Cambridge: Society for Reproduction and Fertility</publisher><subject>Analysis of Variance ; Animals ; Biological and medical sciences ; Body Weight ; Cattle - physiology ; Follicle Stimulating Hormone - blood ; Follicle Stimulating Hormone - secretion ; Fundamental and applied biological sciences. Psychology ; Gonadotropins, Pituitary - secretion ; Image Processing, Computer-Assisted ; Luteinizing Hormone - blood ; Luteinizing Hormone - secretion ; Male ; Melatonin - pharmacology ; Prostate - diagnostic imaging ; Seasons ; Secretory Rate - physiology ; Sexual differentiation and maturation. Puberty. Climacterium ; Sexual Maturation - drug effects ; Sexual Maturation - physiology ; Testis - diagnostic imaging ; Testosterone - blood ; Ultrasonography ; Vertebrates: reproduction</subject><ispartof>Journal of reproduction & fertility, 2000-09, Vol.120 (1), p.159-167</ispartof><rights>2001 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c375t-4649f4deeb5b356aae398fbb47cd2639d55be9327cdbaa697967634d58c1fa313</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,778,782,27911,27912</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=818343$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/11006158$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>ARAVINDAKSHAN, J. P</creatorcontrib><creatorcontrib>HONARAMOOZ, A</creatorcontrib><creatorcontrib>BARTLEWSKI, P. M</creatorcontrib><creatorcontrib>BEARD, A. P</creatorcontrib><creatorcontrib>PIERSON, R. R</creatorcontrib><creatorcontrib>RAWLINGS, N. C</creatorcontrib><title>Gonadotrophin secretion in prepubertal bull calves born in spring and autumn</title><title>Journal of reproduction & fertility</title><addtitle>J Reprod Fertil</addtitle><description>The reproductive development of bull calves born in spring and autumn was compared. Mean serum LH concentrations in calves
born in spring increased from week 4 to week 18 after birth and decreased by week 24. In bull calves born in autumn, mean
LH concentrations increased from week 4 to week 8 after birth and remained steady until week 44. LH pulse amplitude was lower
in bull calves born in autumn than in calves born in spring until week 24 of age (P < 0.05). There was a negative correlation
between LH pulse frequency at week 12 after birth and age at puberty in bull calves, irrespective of season of birth, and
LH pulse frequency at week 18 also tended to correlate negatively with age at puberty. Mean serum FSH concentrations, age
at puberty, bodyweight, scrotal circumference, testes, prostate and vesicular gland dimensions, and ultrasonographic grey
scale (pixel units) were not significantly different between bull calves born in autumn and spring. However, age and body-weight
at puberty were more variable for bull calves born in autumn (P < 0.05). In a second study, bull calves born in spring received
either a melatonin or sham implant immediately after birth and at weeks 6 and 11 after birth. Implants were removed at week
20. Mean LH concentrations, LH pulse frequency and amplitude, mean FSH concentrations and age at puberty did not differ between
the two groups. No significant differences between groups in the growth and pixel units of the reproductive tract were observed
by ultrasonography. In conclusion, although there were differences in the pattern of LH secretion in the prepubertal period
between bull calves born in autumn and spring, the postnatal changes in gonadotrophin secretion were not disrupted by melatonin
treatment in bull calves born in spring. Reproductive tract development did not differ between calves born in spring and autumn
but age at puberty was more variable in bull calves born in autumn. LH pulse frequency during the early prepubertal period
may be a vital factor in determining the age of bull calves at puberty.</description><subject>Analysis of Variance</subject><subject>Animals</subject><subject>Biological and medical sciences</subject><subject>Body Weight</subject><subject>Cattle - physiology</subject><subject>Follicle Stimulating Hormone - blood</subject><subject>Follicle Stimulating Hormone - secretion</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Gonadotropins, Pituitary - secretion</subject><subject>Image Processing, Computer-Assisted</subject><subject>Luteinizing Hormone - blood</subject><subject>Luteinizing Hormone - secretion</subject><subject>Male</subject><subject>Melatonin - pharmacology</subject><subject>Prostate - diagnostic imaging</subject><subject>Seasons</subject><subject>Secretory Rate - physiology</subject><subject>Sexual differentiation and maturation. Puberty. Climacterium</subject><subject>Sexual Maturation - drug effects</subject><subject>Sexual Maturation - physiology</subject><subject>Testis - diagnostic imaging</subject><subject>Testosterone - blood</subject><subject>Ultrasonography</subject><subject>Vertebrates: reproduction</subject><issn>1470-1626</issn><issn>0022-4251</issn><issn>1741-7899</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2000</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNp1kMFLwzAUh4Mobk6PXqUgeOtMmjRpjiI6hYEXPZckfd0yuqQmreJ_b-aGnjy93498vBc-hC4JnpOS4ttNaOcpFhiTUh6hKRGM5KKS8jhlJnBOeMEn6CzGzQ6pBD9FE0Iw5qlM0XLhnWr8EHy_ti6LYAIM1rsslT5AP2oIg-oyPXZdZlT3ATHTPvy8xz5Yt8qUazI1DuPWnaOTVnURLg5zht4eH17vn_Lly-L5_m6ZGyrKIWecyZY1ALrUtORKAZVVqzUTpik4lU1ZapC0SFUrxaWQXHDKmrIypFWU0Bm62e_tg38fIQ711kYDXacc-DHWoqCYyEokMN-DJvgYA7R1-vJWha-a4Hqnr0766hT3-hJ_dVg86i00f_TBVwKuD4CKyUYblDM2_nIVqSijiWJ7am1X608boNbWR2PBDba1Rv1z_Rvpy4nb</recordid><startdate>200009</startdate><enddate>200009</enddate><creator>ARAVINDAKSHAN, J. P</creator><creator>HONARAMOOZ, A</creator><creator>BARTLEWSKI, P. M</creator><creator>BEARD, A. P</creator><creator>PIERSON, R. R</creator><creator>RAWLINGS, N. C</creator><general>Society for Reproduction and Fertility</general><general>Journal of Reproduction and Fertility</general><scope>IQODW</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>200009</creationdate><title>Gonadotrophin secretion in prepubertal bull calves born in spring and autumn</title><author>ARAVINDAKSHAN, J. P ; HONARAMOOZ, A ; BARTLEWSKI, P. M ; BEARD, A. P ; PIERSON, R. R ; RAWLINGS, N. C</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c375t-4649f4deeb5b356aae398fbb47cd2639d55be9327cdbaa697967634d58c1fa313</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2000</creationdate><topic>Analysis of Variance</topic><topic>Animals</topic><topic>Biological and medical sciences</topic><topic>Body Weight</topic><topic>Cattle - physiology</topic><topic>Follicle Stimulating Hormone - blood</topic><topic>Follicle Stimulating Hormone - secretion</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Gonadotropins, Pituitary - secretion</topic><topic>Image Processing, Computer-Assisted</topic><topic>Luteinizing Hormone - blood</topic><topic>Luteinizing Hormone - secretion</topic><topic>Male</topic><topic>Melatonin - pharmacology</topic><topic>Prostate - diagnostic imaging</topic><topic>Seasons</topic><topic>Secretory Rate - physiology</topic><topic>Sexual differentiation and maturation. Puberty. Climacterium</topic><topic>Sexual Maturation - drug effects</topic><topic>Sexual Maturation - physiology</topic><topic>Testis - diagnostic imaging</topic><topic>Testosterone - blood</topic><topic>Ultrasonography</topic><topic>Vertebrates: reproduction</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>ARAVINDAKSHAN, J. P</creatorcontrib><creatorcontrib>HONARAMOOZ, A</creatorcontrib><creatorcontrib>BARTLEWSKI, P. M</creatorcontrib><creatorcontrib>BEARD, A. P</creatorcontrib><creatorcontrib>PIERSON, R. R</creatorcontrib><creatorcontrib>RAWLINGS, N. C</creatorcontrib><collection>Pascal-Francis</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>Journal of reproduction & fertility</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>ARAVINDAKSHAN, J. P</au><au>HONARAMOOZ, A</au><au>BARTLEWSKI, P. M</au><au>BEARD, A. P</au><au>PIERSON, R. R</au><au>RAWLINGS, N. C</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Gonadotrophin secretion in prepubertal bull calves born in spring and autumn</atitle><jtitle>Journal of reproduction & fertility</jtitle><addtitle>J Reprod Fertil</addtitle><date>2000-09</date><risdate>2000</risdate><volume>120</volume><issue>1</issue><spage>159</spage><epage>167</epage><pages>159-167</pages><issn>1470-1626</issn><issn>0022-4251</issn><eissn>1741-7899</eissn><coden>JRPFA4</coden><abstract>The reproductive development of bull calves born in spring and autumn was compared. Mean serum LH concentrations in calves
born in spring increased from week 4 to week 18 after birth and decreased by week 24. In bull calves born in autumn, mean
LH concentrations increased from week 4 to week 8 after birth and remained steady until week 44. LH pulse amplitude was lower
in bull calves born in autumn than in calves born in spring until week 24 of age (P < 0.05). There was a negative correlation
between LH pulse frequency at week 12 after birth and age at puberty in bull calves, irrespective of season of birth, and
LH pulse frequency at week 18 also tended to correlate negatively with age at puberty. Mean serum FSH concentrations, age
at puberty, bodyweight, scrotal circumference, testes, prostate and vesicular gland dimensions, and ultrasonographic grey
scale (pixel units) were not significantly different between bull calves born in autumn and spring. However, age and body-weight
at puberty were more variable for bull calves born in autumn (P < 0.05). In a second study, bull calves born in spring received
either a melatonin or sham implant immediately after birth and at weeks 6 and 11 after birth. Implants were removed at week
20. Mean LH concentrations, LH pulse frequency and amplitude, mean FSH concentrations and age at puberty did not differ between
the two groups. No significant differences between groups in the growth and pixel units of the reproductive tract were observed
by ultrasonography. In conclusion, although there were differences in the pattern of LH secretion in the prepubertal period
between bull calves born in autumn and spring, the postnatal changes in gonadotrophin secretion were not disrupted by melatonin
treatment in bull calves born in spring. Reproductive tract development did not differ between calves born in spring and autumn
but age at puberty was more variable in bull calves born in autumn. LH pulse frequency during the early prepubertal period
may be a vital factor in determining the age of bull calves at puberty.</abstract><cop>Cambridge</cop><pub>Society for Reproduction and Fertility</pub><pmid>11006158</pmid><doi>10.1530/jrf.0.1200159</doi><tpages>9</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 1470-1626 |
| ispartof | Journal of reproduction & fertility, 2000-09, Vol.120 (1), p.159-167 |
| issn | 1470-1626 0022-4251 1741-7899 |
| language | eng |
| recordid | cdi_crossref_primary_10_1530_jrf_0_1200159 |
| source | MEDLINE; Alma/SFX Local Collection |
| subjects | Analysis of Variance Animals Biological and medical sciences Body Weight Cattle - physiology Follicle Stimulating Hormone - blood Follicle Stimulating Hormone - secretion Fundamental and applied biological sciences. Psychology Gonadotropins, Pituitary - secretion Image Processing, Computer-Assisted Luteinizing Hormone - blood Luteinizing Hormone - secretion Male Melatonin - pharmacology Prostate - diagnostic imaging Seasons Secretory Rate - physiology Sexual differentiation and maturation. Puberty. Climacterium Sexual Maturation - drug effects Sexual Maturation - physiology Testis - diagnostic imaging Testosterone - blood Ultrasonography Vertebrates: reproduction |
| title | Gonadotrophin secretion in prepubertal bull calves born in spring and autumn |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-15T11%3A01%3A24IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_cross&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Gonadotrophin%20secretion%20in%20prepubertal%20bull%20calves%20born%20in%20spring%20and%20autumn&rft.jtitle=Journal%20of%20reproduction%20&%20fertility&rft.au=ARAVINDAKSHAN,%20J.%20P&rft.date=2000-09&rft.volume=120&rft.issue=1&rft.spage=159&rft.epage=167&rft.pages=159-167&rft.issn=1470-1626&rft.eissn=1741-7899&rft.coden=JRPFA4&rft_id=info:doi/10.1530/jrf.0.1200159&rft_dat=%3Cproquest_cross%3E72301987%3C/proquest_cross%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=72301987&rft_id=info:pmid/11006158&rfr_iscdi=true |