<b>Reproductive cycles in white Karaman ewes: comparison of ovarian hormone secretion and reproductive behavior in non-pregnant and pregnant ewes in semi-intensive conditions
The objective of this study was to characterize the reproductive cycle both endocrinologically and behaviorally in ewes. Blood samples were analyzed by EIA for progesterone (P4), and RIA for estradiol in order to determine the breeding strategy of non-pregnant (n = 11) and pregnant (n = 9) White Kar...
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| Format: | Article |
| Language: | English |
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Editora da Universidade Estadual de Maringá (Eduem)
2018-10-01
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| Series: | Acta Scientiarum: Animal Sciences |
| Subjects: | |
| Online Access: | http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/39908 |
| _version_ | 1818249751939776512 |
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| author | Dilek Arsoy Vedat Sağmanlıgil |
| author_facet | Dilek Arsoy Vedat Sağmanlıgil |
| author_sort | Dilek Arsoy |
| collection | DOAJ |
| description | The objective of this study was to characterize the reproductive cycle both endocrinologically and behaviorally in ewes. Blood samples were analyzed by EIA for progesterone (P4), and RIA for estradiol in order to determine the breeding strategy of non-pregnant (n = 11) and pregnant (n = 9) White Karaman throughout the year in the Middle Anatolia (39.570N, 32.530W), Turkey. Estrous cycle lengths and estrous lengths were 18.36 ± 1.03 days and 35.16 ± 5.95 hours, respectively. The breeding season durations were 283 ± 63.36 days and 229.64 ± 63.74 days according to hormonal and behavioral data respectively (p £ 0.01). The highest and lowest data of estrous occurrence frequency was observed in October and June-July, respectively. P4 levels ranged from 0.01 to 9.0 ng mL-1 throughout the year and from 0.01 to 0.16 ng mL-1 during anestrous. Mean plasma estradiol levels were 8.42 ± 2.51 pg mL-1 during the estrous cycle. Postpartum anestrous durations were 134.8 ± 18.5 and 120.78 ± 29.89 days (n = 9) according to behavioral observation and hormonal data, respectively. P4 concentration for the months 1 – 5 of the gestation period ranged from 4.54 to 15.08 ng mL-1. P4 concentrations in 4th and 5th months of gestation were higher than the other months (p £ 0.01). White Karaman reproductive activity is characterized by an extended breeding season and their relatively insensitivity to photoperiod stimulation allows for efficient out of season lamb production. |
| first_indexed | 2024-12-12T15:41:29Z |
| format | Article |
| id | doaj.art-5c4bf0aa0b7746d2bcb61650d70d60ff |
| institution | Directory Open Access Journal |
| issn | 1807-8672 |
| language | English |
| last_indexed | 2024-12-12T15:41:29Z |
| publishDate | 2018-10-01 |
| publisher | Editora da Universidade Estadual de Maringá (Eduem) |
| record_format | Article |
| series | Acta Scientiarum: Animal Sciences |
| spelling | doaj.art-5c4bf0aa0b7746d2bcb61650d70d60ff2022-12-22T00:19:54ZengEditora da Universidade Estadual de Maringá (Eduem)Acta Scientiarum: Animal Sciences1807-86722018-10-01401e39908e3990810.4025/actascianimsci.v40i1.3990818831<b>Reproductive cycles in white Karaman ewes: comparison of ovarian hormone secretion and reproductive behavior in non-pregnant and pregnant ewes in semi-intensive conditionsDilek Arsoy0Vedat Sağmanlıgil1University of Near EastUniversity of Near EastThe objective of this study was to characterize the reproductive cycle both endocrinologically and behaviorally in ewes. Blood samples were analyzed by EIA for progesterone (P4), and RIA for estradiol in order to determine the breeding strategy of non-pregnant (n = 11) and pregnant (n = 9) White Karaman throughout the year in the Middle Anatolia (39.570N, 32.530W), Turkey. Estrous cycle lengths and estrous lengths were 18.36 ± 1.03 days and 35.16 ± 5.95 hours, respectively. The breeding season durations were 283 ± 63.36 days and 229.64 ± 63.74 days according to hormonal and behavioral data respectively (p £ 0.01). The highest and lowest data of estrous occurrence frequency was observed in October and June-July, respectively. P4 levels ranged from 0.01 to 9.0 ng mL-1 throughout the year and from 0.01 to 0.16 ng mL-1 during anestrous. Mean plasma estradiol levels were 8.42 ± 2.51 pg mL-1 during the estrous cycle. Postpartum anestrous durations were 134.8 ± 18.5 and 120.78 ± 29.89 days (n = 9) according to behavioral observation and hormonal data, respectively. P4 concentration for the months 1 – 5 of the gestation period ranged from 4.54 to 15.08 ng mL-1. P4 concentrations in 4th and 5th months of gestation were higher than the other months (p £ 0.01). White Karaman reproductive activity is characterized by an extended breeding season and their relatively insensitivity to photoperiod stimulation allows for efficient out of season lamb production.http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/39908breeding seasonestradiolindigenous ewespostpartum estrousprogesterone. |
| spellingShingle | Dilek Arsoy Vedat Sağmanlıgil <b>Reproductive cycles in white Karaman ewes: comparison of ovarian hormone secretion and reproductive behavior in non-pregnant and pregnant ewes in semi-intensive conditions Acta Scientiarum: Animal Sciences breeding season estradiol indigenous ewes postpartum estrous progesterone. |
| title | <b>Reproductive cycles in white Karaman ewes: comparison of ovarian hormone secretion and reproductive behavior in non-pregnant and pregnant ewes in semi-intensive conditions |
| title_full | <b>Reproductive cycles in white Karaman ewes: comparison of ovarian hormone secretion and reproductive behavior in non-pregnant and pregnant ewes in semi-intensive conditions |
| title_fullStr | <b>Reproductive cycles in white Karaman ewes: comparison of ovarian hormone secretion and reproductive behavior in non-pregnant and pregnant ewes in semi-intensive conditions |
| title_full_unstemmed | <b>Reproductive cycles in white Karaman ewes: comparison of ovarian hormone secretion and reproductive behavior in non-pregnant and pregnant ewes in semi-intensive conditions |
| title_short | <b>Reproductive cycles in white Karaman ewes: comparison of ovarian hormone secretion and reproductive behavior in non-pregnant and pregnant ewes in semi-intensive conditions |
| title_sort | b reproductive cycles in white karaman ewes comparison of ovarian hormone secretion and reproductive behavior in non pregnant and pregnant ewes in semi intensive conditions |
| topic | breeding season estradiol indigenous ewes postpartum estrous progesterone. |
| url | http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/39908 |
| work_keys_str_mv | AT dilekarsoy breproductivecyclesinwhitekaramanewescomparisonofovarianhormonesecretionandreproductivebehaviorinnonpregnantandpregnantewesinsemiintensiveconditions AT vedatsagmanlıgil breproductivecyclesinwhitekaramanewescomparisonofovarianhormonesecretionandreproductivebehaviorinnonpregnantandpregnantewesinsemiintensiveconditions |