Effects of lactation status, progestogen and ram exposure on response to cloprostenol in ewes during the anestrous season
Progestogen pretreatment and introduction of rams were used to prepare 432 Rasa aragonesa ewes for synchronization of estrus with prostaglandin (PG) during anestrus. The experiment was a 3 × 3 × 2 factorial with lactation status, ram/progestogen treatment and treatment with pregnant mare's serum gonadotropin (PMSG; 250 IU) at injection of PG as main effects. At ram introduction (Day 0), ewes were dry (Group 1), weaned (Group 2) or suckling a lamb (Group 3). They received either norgestomet implants for 12 d (Days -12 to Day 0 (Group A), ram introduction for 12 d (Days 0 to 12) (Group B) or both (Group C). Half the ewes received PMSG with PG (100 μg Cloprostenol) on Day 12. Pregnancy rate was higher at first service in dry (Group 1; 42%) than in recently-weaned ewes (Group 3; 24% and Group 2; 31%; P<0.01). Occurrence of estrus and conception and pregnancy rates to first service were higher (P<0.01) in ewes previously exposed to rams (Groups B and C) than in ewes treated only with progestogen (Group A). There were no effects of PMSG, no interactions among the three variables and no differences in prolificacy (1.12 at first service). © 1988.
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Format: | artículo biblioteca |
Language: | English |
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Elsevier
1988
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Subjects: | Anestrous ewes, Ram exposure, Prostaglandin F2α, Estrous synchronization, |
Online Access: | http://hdl.handle.net/20.500.12792/2439 http://hdl.handle.net/10261/293129 |
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dig-inia-es-10261-2931292023-02-20T07:36:14Z Effects of lactation status, progestogen and ram exposure on response to cloprostenol in ewes during the anestrous season López Sebastián, Antonio Inskeep, E. K. Anestrous ewes Ram exposure Prostaglandin F2α Estrous synchronization Progestogen pretreatment and introduction of rams were used to prepare 432 Rasa aragonesa ewes for synchronization of estrus with prostaglandin (PG) during anestrus. The experiment was a 3 × 3 × 2 factorial with lactation status, ram/progestogen treatment and treatment with pregnant mare's serum gonadotropin (PMSG; 250 IU) at injection of PG as main effects. At ram introduction (Day 0), ewes were dry (Group 1), weaned (Group 2) or suckling a lamb (Group 3). They received either norgestomet implants for 12 d (Days -12 to Day 0 (Group A), ram introduction for 12 d (Days 0 to 12) (Group B) or both (Group C). Half the ewes received PMSG with PG (100 μg Cloprostenol) on Day 12. Pregnancy rate was higher at first service in dry (Group 1; 42%) than in recently-weaned ewes (Group 3; 24% and Group 2; 31%; P<0.01). Occurrence of estrus and conception and pregnancy rates to first service were higher (P<0.01) in ewes previously exposed to rams (Groups B and C) than in ewes treated only with progestogen (Group A). There were no effects of PMSG, no interactions among the three variables and no differences in prolificacy (1.12 at first service). © 1988. 2023-02-20T07:36:14Z 2023-02-20T07:36:14Z 1988 artículo Theriogenology 30(2): 279-289 (1988) 0093-691X http://hdl.handle.net/20.500.12792/2439 http://hdl.handle.net/10261/293129 10.1016/0093-691X(88)90177-X 1879-3231 en none Elsevier |
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Anestrous ewes Ram exposure Prostaglandin F2α Estrous synchronization Anestrous ewes Ram exposure Prostaglandin F2α Estrous synchronization |
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Anestrous ewes Ram exposure Prostaglandin F2α Estrous synchronization Anestrous ewes Ram exposure Prostaglandin F2α Estrous synchronization López Sebastián, Antonio Inskeep, E. K. Effects of lactation status, progestogen and ram exposure on response to cloprostenol in ewes during the anestrous season |
description |
Progestogen pretreatment and introduction of rams were used to prepare 432 Rasa aragonesa ewes for synchronization of estrus with prostaglandin (PG) during anestrus. The experiment was a 3 × 3 × 2 factorial with lactation status, ram/progestogen treatment and treatment with pregnant mare's serum gonadotropin (PMSG; 250 IU) at injection of PG as main effects. At ram introduction (Day 0), ewes were dry (Group 1), weaned (Group 2) or suckling a lamb (Group 3). They received either norgestomet implants for 12 d (Days -12 to Day 0 (Group A), ram introduction for 12 d (Days 0 to 12) (Group B) or both (Group C). Half the ewes received PMSG with PG (100 μg Cloprostenol) on Day 12. Pregnancy rate was higher at first service in dry (Group 1; 42%) than in recently-weaned ewes (Group 3; 24% and Group 2; 31%; P<0.01). Occurrence of estrus and conception and pregnancy rates to first service were higher (P<0.01) in ewes previously exposed to rams (Groups B and C) than in ewes treated only with progestogen (Group A). There were no effects of PMSG, no interactions among the three variables and no differences in prolificacy (1.12 at first service). © 1988. |
format |
artículo |
topic_facet |
Anestrous ewes Ram exposure Prostaglandin F2α Estrous synchronization |
author |
López Sebastián, Antonio Inskeep, E. K. |
author_facet |
López Sebastián, Antonio Inskeep, E. K. |
author_sort |
López Sebastián, Antonio |
title |
Effects of lactation status, progestogen and ram exposure on response to cloprostenol in ewes during the anestrous season |
title_short |
Effects of lactation status, progestogen and ram exposure on response to cloprostenol in ewes during the anestrous season |
title_full |
Effects of lactation status, progestogen and ram exposure on response to cloprostenol in ewes during the anestrous season |
title_fullStr |
Effects of lactation status, progestogen and ram exposure on response to cloprostenol in ewes during the anestrous season |
title_full_unstemmed |
Effects of lactation status, progestogen and ram exposure on response to cloprostenol in ewes during the anestrous season |
title_sort |
effects of lactation status, progestogen and ram exposure on response to cloprostenol in ewes during the anestrous season |
publisher |
Elsevier |
publishDate |
1988 |
url |
http://hdl.handle.net/20.500.12792/2439 http://hdl.handle.net/10261/293129 |
work_keys_str_mv |
AT lopezsebastianantonio effectsoflactationstatusprogestogenandramexposureonresponsetocloprostenolinewesduringtheanestrousseason AT inskeepek effectsoflactationstatusprogestogenandramexposureonresponsetocloprostenolinewesduringtheanestrousseason |
_version_ |
1767603437786103808 |