Is the Santa Inês sheep a typical non-seasonal breeder in the Brazilian Southeast?
This study aimed to characterize the annual reproductive cycle of Santa Inês sheep in the Fluminense lowland region (latitude 22° 27′ 45″ south, Rio de Janeiro, Brazil) between September 2011 and August 2012. Ten ewes were maintained in a semi-intensive system under natural photoperiods with access...
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| Veröffentlicht in: | Tropical animal health and production 2014-12, Vol.46 (8), p.1533-1537 |
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| creator | Balaro, Mario Felipe Alvarez da Fonseca, Jeferson Ferreira Oba, Eunice da Cruz Cardoso, Elyzabeth Brandão, Felipe Zandonadi |
| description | This study aimed to characterize the annual reproductive cycle of Santa Inês sheep in the Fluminense lowland region (latitude 22° 27′ 45″ south, Rio de Janeiro, Brazil) between September 2011 and August 2012. Ten ewes were maintained in a semi-intensive system under natural photoperiods with access to pasture and shelter. Blood samples were collected every 2 weeks to determine plasma progesterone concentrations. The body condition score (BCS) was determined each month. There was no seasonal variation in the plasma progesterone concentration from the months of September to January, April, and May to August. In the months of February and April, the plasma hormone levels were higher than August to November. Seventy percent (7/10) of the sheep studied had short seasonal anestrus. The periods of anestrus were concentrated between the months of September and December (spring season) in 85.7 % (6/7) of the cases evaluated. In these cases, 57.1 % (4/7) also had short periods of reproductive inactivity during other months of the year. The progesterone values obtained in the spring corroborate the higher reproductive anestrus observed in this season. Higher plasma progesterone values were found in summer and autumn with reduction in the winter to lower values in the spring. No changes in the BCS during the study period were observed. Under the studied conditions, the Santa Inês sheep showed a low degree of reproductive seasonality. However, some individual ewes had seasonal anestrus during the spring. Further studies that include management techniques are needed to improve reproductive efficiency without hormone therapy in this breed under tropical conditions. |
| doi_str_mv | 10.1007/s11250-014-0672-8 |
| format | Article |
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Ten ewes were maintained in a semi-intensive system under natural photoperiods with access to pasture and shelter. Blood samples were collected every 2 weeks to determine plasma progesterone concentrations. The body condition score (BCS) was determined each month. There was no seasonal variation in the plasma progesterone concentration from the months of September to January, April, and May to August. In the months of February and April, the plasma hormone levels were higher than August to November. Seventy percent (7/10) of the sheep studied had short seasonal anestrus. The periods of anestrus were concentrated between the months of September and December (spring season) in 85.7 % (6/7) of the cases evaluated. In these cases, 57.1 % (4/7) also had short periods of reproductive inactivity during other months of the year. The progesterone values obtained in the spring corroborate the higher reproductive anestrus observed in this season. Higher plasma progesterone values were found in summer and autumn with reduction in the winter to lower values in the spring. No changes in the BCS during the study period were observed. Under the studied conditions, the Santa Inês sheep showed a low degree of reproductive seasonality. However, some individual ewes had seasonal anestrus during the spring. Further studies that include management techniques are needed to improve reproductive efficiency without hormone therapy in this breed under tropical conditions.</description><identifier>ISSN: 0049-4747</identifier><identifier>EISSN: 1573-7438</identifier><identifier>DOI: 10.1007/s11250-014-0672-8</identifier><identifier>PMID: 25252775</identifier><language>eng</language><publisher>Dordrecht: Springer-Verlag</publisher><subject>anestrus ; Animals ; autumn ; Biomedical and Life Sciences ; blood ; body condition ; Brazil ; Estrous Cycle - physiology ; ewes ; Female ; hormone replacement therapy ; latitude ; Life Sciences ; Pasture ; Photoperiod ; progesterone ; Progesterone - blood ; Reproductive cycle ; reproductive efficiency ; seasonal variation ; Seasonal variations ; Seasons ; Sheep ; Sheep - physiology ; Short Communications ; Spring ; summer ; Time Factors ; Veterinary Medicine/Veterinary Science ; winter ; Zoology</subject><ispartof>Tropical animal health and production, 2014-12, Vol.46 (8), p.1533-1537</ispartof><rights>Springer Science+Business Media Dordrecht 2014</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c3818-3a9012214bd700e1aa79c9a09a40b864312dbe3f480b932a052fa786464756913</citedby><cites>FETCH-LOGICAL-c3818-3a9012214bd700e1aa79c9a09a40b864312dbe3f480b932a052fa786464756913</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s11250-014-0672-8$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s11250-014-0672-8$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,776,780,27901,27902,41464,42533,51294</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/25252775$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Balaro, Mario Felipe Alvarez</creatorcontrib><creatorcontrib>da Fonseca, Jeferson Ferreira</creatorcontrib><creatorcontrib>Oba, Eunice</creatorcontrib><creatorcontrib>da Cruz Cardoso, Elyzabeth</creatorcontrib><creatorcontrib>Brandão, Felipe Zandonadi</creatorcontrib><title>Is the Santa Inês sheep a typical non-seasonal breeder in the Brazilian Southeast?</title><title>Tropical animal health and production</title><addtitle>Trop Anim Health Prod</addtitle><addtitle>Trop Anim Health Prod</addtitle><description>This study aimed to characterize the annual reproductive cycle of Santa Inês sheep in the Fluminense lowland region (latitude 22° 27′ 45″ south, Rio de Janeiro, Brazil) between September 2011 and August 2012. Ten ewes were maintained in a semi-intensive system under natural photoperiods with access to pasture and shelter. Blood samples were collected every 2 weeks to determine plasma progesterone concentrations. The body condition score (BCS) was determined each month. There was no seasonal variation in the plasma progesterone concentration from the months of September to January, April, and May to August. In the months of February and April, the plasma hormone levels were higher than August to November. Seventy percent (7/10) of the sheep studied had short seasonal anestrus. The periods of anestrus were concentrated between the months of September and December (spring season) in 85.7 % (6/7) of the cases evaluated. In these cases, 57.1 % (4/7) also had short periods of reproductive inactivity during other months of the year. The progesterone values obtained in the spring corroborate the higher reproductive anestrus observed in this season. Higher plasma progesterone values were found in summer and autumn with reduction in the winter to lower values in the spring. No changes in the BCS during the study period were observed. Under the studied conditions, the Santa Inês sheep showed a low degree of reproductive seasonality. However, some individual ewes had seasonal anestrus during the spring. Further studies that include management techniques are needed to improve reproductive efficiency without hormone therapy in this breed under tropical conditions.</description><subject>anestrus</subject><subject>Animals</subject><subject>autumn</subject><subject>Biomedical and Life Sciences</subject><subject>blood</subject><subject>body condition</subject><subject>Brazil</subject><subject>Estrous Cycle - physiology</subject><subject>ewes</subject><subject>Female</subject><subject>hormone replacement therapy</subject><subject>latitude</subject><subject>Life Sciences</subject><subject>Pasture</subject><subject>Photoperiod</subject><subject>progesterone</subject><subject>Progesterone - blood</subject><subject>Reproductive cycle</subject><subject>reproductive efficiency</subject><subject>seasonal variation</subject><subject>Seasonal variations</subject><subject>Seasons</subject><subject>Sheep</subject><subject>Sheep - physiology</subject><subject>Short Communications</subject><subject>Spring</subject><subject>summer</subject><subject>Time Factors</subject><subject>Veterinary Medicine/Veterinary Science</subject><subject>winter</subject><subject>Zoology</subject><issn>0049-4747</issn><issn>1573-7438</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><sourceid>BENPR</sourceid><recordid>eNp9kc9O3DAQxq2qqGxpH6CX1hIXLm7H_2L7VLWIwkpIHLacrUnWgaCss7WTAzwSr8GL4SW0Qj0gH0b2_L5v5G8I-cThKwcw3zLnQgMDrhhURjD7hiy4NpIZJe1bsgBQjimjzD55n_MNQFHZ6h3ZF7ocY_SCrJaZjteBrjCOSJfx4T7TfB3CliIdb7ddgz2NQ2Q5YB5iudQphHVItItPup8J77q-w0hXw1QeMI_fP5C9FvscPj7XA3L56-T38Rk7vzhdHv84Z4203DKJDrgQXNVrAxA4onGNQ3CooLaVklys6yBbZaF2UiBo0aIpjUoZXTkuD8jR7LtNw58p5NFvutyEvscYhil7XkmlnJNaFPTwP_RmmFL5z44SmlfGOCgUn6kmDTmn0Ppt6jaYbj0Hv0vcz4n7krjfJe5t0Xx-dp7qTVj_U_yNuABiBnJpxauQXox-xfXLLGpx8HiVuuwvVwK4hrJBq1QlHwGEKJIA</recordid><startdate>201412</startdate><enddate>201412</enddate><creator>Balaro, Mario Felipe Alvarez</creator><creator>da Fonseca, Jeferson Ferreira</creator><creator>Oba, Eunice</creator><creator>da Cruz Cardoso, Elyzabeth</creator><creator>Brandão, Felipe Zandonadi</creator><general>Springer-Verlag</general><general>Springer Netherlands</general><general>Springer Nature B.V</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>3V.</scope><scope>7QL</scope><scope>7T7</scope><scope>7U7</scope><scope>7U9</scope><scope>7X2</scope><scope>7X7</scope><scope>7XB</scope><scope>88E</scope><scope>8AO</scope><scope>8C1</scope><scope>8FD</scope><scope>8FE</scope><scope>8FH</scope><scope>8FI</scope><scope>8FJ</scope><scope>8FK</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>ATCPS</scope><scope>AZQEC</scope><scope>BBNVY</scope><scope>BENPR</scope><scope>BHPHI</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>FR3</scope><scope>FYUFA</scope><scope>GHDGH</scope><scope>GNUQQ</scope><scope>H94</scope><scope>HCIFZ</scope><scope>K9.</scope><scope>LK8</scope><scope>M0K</scope><scope>M0S</scope><scope>M1P</scope><scope>M7N</scope><scope>M7P</scope><scope>P64</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>7X8</scope></search><sort><creationdate>201412</creationdate><title>Is the Santa Inês sheep a typical non-seasonal breeder in the Brazilian Southeast?</title><author>Balaro, Mario Felipe Alvarez ; da Fonseca, Jeferson Ferreira ; Oba, Eunice ; da Cruz Cardoso, Elyzabeth ; Brandão, Felipe Zandonadi</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c3818-3a9012214bd700e1aa79c9a09a40b864312dbe3f480b932a052fa786464756913</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>anestrus</topic><topic>Animals</topic><topic>autumn</topic><topic>Biomedical and Life Sciences</topic><topic>blood</topic><topic>body condition</topic><topic>Brazil</topic><topic>Estrous Cycle - 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Academic</collection><jtitle>Tropical animal health and production</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Balaro, Mario Felipe Alvarez</au><au>da Fonseca, Jeferson Ferreira</au><au>Oba, Eunice</au><au>da Cruz Cardoso, Elyzabeth</au><au>Brandão, Felipe Zandonadi</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Is the Santa Inês sheep a typical non-seasonal breeder in the Brazilian Southeast?</atitle><jtitle>Tropical animal health and production</jtitle><stitle>Trop Anim Health Prod</stitle><addtitle>Trop Anim Health Prod</addtitle><date>2014-12</date><risdate>2014</risdate><volume>46</volume><issue>8</issue><spage>1533</spage><epage>1537</epage><pages>1533-1537</pages><issn>0049-4747</issn><eissn>1573-7438</eissn><abstract>This study aimed to characterize the annual reproductive cycle of Santa Inês sheep in the Fluminense lowland region (latitude 22° 27′ 45″ south, Rio de Janeiro, Brazil) between September 2011 and August 2012. Ten ewes were maintained in a semi-intensive system under natural photoperiods with access to pasture and shelter. Blood samples were collected every 2 weeks to determine plasma progesterone concentrations. The body condition score (BCS) was determined each month. There was no seasonal variation in the plasma progesterone concentration from the months of September to January, April, and May to August. In the months of February and April, the plasma hormone levels were higher than August to November. Seventy percent (7/10) of the sheep studied had short seasonal anestrus. The periods of anestrus were concentrated between the months of September and December (spring season) in 85.7 % (6/7) of the cases evaluated. In these cases, 57.1 % (4/7) also had short periods of reproductive inactivity during other months of the year. The progesterone values obtained in the spring corroborate the higher reproductive anestrus observed in this season. Higher plasma progesterone values were found in summer and autumn with reduction in the winter to lower values in the spring. No changes in the BCS during the study period were observed. Under the studied conditions, the Santa Inês sheep showed a low degree of reproductive seasonality. However, some individual ewes had seasonal anestrus during the spring. Further studies that include management techniques are needed to improve reproductive efficiency without hormone therapy in this breed under tropical conditions.</abstract><cop>Dordrecht</cop><pub>Springer-Verlag</pub><pmid>25252775</pmid><doi>10.1007/s11250-014-0672-8</doi><tpages>5</tpages></addata></record> |
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| subjects | anestrus Animals autumn Biomedical and Life Sciences blood body condition Brazil Estrous Cycle - physiology ewes Female hormone replacement therapy latitude Life Sciences Pasture Photoperiod progesterone Progesterone - blood Reproductive cycle reproductive efficiency seasonal variation Seasonal variations Seasons Sheep Sheep - physiology Short Communications Spring summer Time Factors Veterinary Medicine/Veterinary Science winter Zoology |
| title | Is the Santa Inês sheep a typical non-seasonal breeder in the Brazilian Southeast? |
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