dc.contributor | Universidade Estadual Paulista (Unesp) | |
dc.contributor | Univ Florida | |
dc.date.accessioned | 2013-09-30T18:27:46Z | |
dc.date.accessioned | 2014-05-20T13:41:19Z | |
dc.date.accessioned | 2022-10-05T13:59:48Z | |
dc.date.available | 2013-09-30T18:27:46Z | |
dc.date.available | 2014-05-20T13:41:19Z | |
dc.date.available | 2022-10-05T13:59:48Z | |
dc.date.created | 2013-09-30T18:27:46Z | |
dc.date.created | 2014-05-20T13:41:19Z | |
dc.date.issued | 2009-05-01 | |
dc.identifier | Animal Reproduction Science. Amsterdam: Elsevier B.V., v. 112, n. 1-2, p. 95-106, 2009. | |
dc.identifier | 0378-4320 | |
dc.identifier | http://hdl.handle.net/11449/14325 | |
dc.identifier | 10.1016/j.anireprosci.2008.04.006 | |
dc.identifier | WOS:000264941200008 | |
dc.identifier | 1069922096621313 | |
dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/3889691 | |
dc.description.abstract | Three experiments evaluated effects of estradiol (E(2)) and/or progesterone (P(4)) prior to induction of ovulation with GnRH on subsequent luteal lifespan in anestrous Nelore cows. In Experiment 1, cows (25-65 days post-partum [DPP]; n = 114) were assigned randomly to receive a 6-day treatment with an intravaginal R device (CIDR(R)) and/or 1 mg i.m. injection of 17 beta-E(2) (4 groups; 2 x 2 factorial design) prior to ovulation. Blood samples were collected on days 0, 5, 7, 9, 12, 15 and 19 for evaluation of luteal function. Pre-treatment with P(4) reduced occurrence of premature luteolysis (PL; 79.2% in non-treated vs. 13.5% in treated cows; P < 0.01), but there was no effect of treatment with 17 beta-E(2) on percentage of PL. In Experiment 2, cows (30-40 DPP; n =: 35) were assigned randomly to receive either 0.5 mL i.m. injection of cottonseed oil (placebo) or 1 mg i.m. injection of E(2) cypionate. Blood samples were collected on days 0, 5, 9 and 15 for evaluation of luteal function. Incidence of PL (83.0% in Control Group vs. 75.0% in ECP Group; P>0.1) and mean serum P(4) did not differ between treatment groups. In Experiment 3, cows (30-60 DPP; it = 109) were randomly assigned to receive either a 6-day (6-d Group) or a 3-day (3-d Group) treatment with CIDR(R). Blood samples were collected on days 0, 5, 7 and 9 for luteal function evaluation. Incidence of PL (5.5% in 6-day vs. 5.5% in 3-day groups; P > 0.1) and mean serum P(4) did not differ between treatment groups. In conclusion, both 3- and 6-day treatments with P(4) prior to induction of ovulation in anestrous Nelore cows increased percentage of normal luteal lifespan, while administration of 1 mg of 17 beta-E(2) or E(2) cypionate failed to prevent occurrence of PL. (C) 2008 Elsevier B.V. All rights reserved. | |
dc.language | eng | |
dc.publisher | Elsevier B.V. | |
dc.relation | Animal Reproduction Science | |
dc.relation | 1.647 | |
dc.relation | 0,704 | |
dc.rights | Acesso restrito | |
dc.source | Web of Science | |
dc.subject | Cattle-anestrous | |
dc.subject | 17 beta-Estradiol | |
dc.subject | Estradiol cypionate | |
dc.subject | Progesterone | |
dc.subject | Short estrous cycle | |
dc.title | Effect of progesterone and/or estradiol treatments prior to induction of ovulation on subsequent luteal lifespan in anestrous Nelore cows | |
dc.type | Artigo | |