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http://acervodigital.unesp.br/handle/11449/2536
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DC Field | Value | Language |
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dc.contributor.author | Ayres, H. | - |
dc.contributor.author | Martins, C. M. | - |
dc.contributor.author | Ferreira, R. M. | - |
dc.contributor.author | Mello, J. E. | - |
dc.contributor.author | Dominguez, J. H. | - |
dc.contributor.author | Souza, A. H. | - |
dc.contributor.author | Valentin, R. | - |
dc.contributor.author | Santos, I. C. C. | - |
dc.contributor.author | Baruselli, P. S. | - |
dc.date.accessioned | 2014-05-20T13:15:22Z | - |
dc.date.accessioned | 2016-10-25T16:36:42Z | - |
dc.date.available | 2014-05-20T13:15:22Z | - |
dc.date.available | 2016-10-25T16:36:42Z | - |
dc.date.issued | 2008-12-01 | - |
dc.identifier | http://dx.doi.org/10.1016/j.anireprosci.2007.12.001 | - |
dc.identifier.citation | Animal Reproduction Science. Amsterdam: Elsevier B.V., v. 109, n. 1-4, p. 77-87, 2008. | - |
dc.identifier.issn | 0378-4320 | - |
dc.identifier.uri | http://hdl.handle.net/11449/2536 | - |
dc.identifier.uri | http://acervodigital.unesp.br/handle/11449/2536 | - |
dc.description.abstract | The present study investigated how the timing of the administration of estradiol benzoate (EB) impacted the synchronization of ovulation in fixed-time artificial insemination protocols of cattle. To accomplish this, two experiments were conducted, with EB injection occurring at different times: at withdrawal of the progesterone-releasing (N) intravaginal device or 24 h later. The effectiveness of these times was compared by examining ovarian follicular dynamics (Experiment 1, n = 30) and conception rates (Experiment 2, n = 504). In Experiment 1, follicular dynamics was performed in 30 Nelore cows (Bos indicus) allocated into two groups. on a random day of the estrous cycle (Day 0), both groups received 2 mg of EB i.m. and a P4-releasing intravaginal device, which was removed on Day 8, when 400 IU of eCG and 150 mu g of PGF were administered. The control group (G-EB9; n = 15) received 1 mg of EB on Day 9, while Group EB8 (G-EB8; n = 15) received the same dose a day earlier. Ovarian ultrasonographic evaluations were performed every 8 h after device removal until ovulation. The timing of EB administration (Day 8 compared with Day 9) did affect the interval between P4 device removal to ovulation (59.4 +/- 2.0 h compared with 69.3 +/- 1.7 h) and maximum diameter of dominant (1.54 +/- 0.06 a cm compared with 1.71 +/- 0.05 b cm, P = 0.03) and ovulatory (1.46 +/- 0.05 a cm compared with 1.58 +/- 0.04 b cm, P < 0.01) follicles. In Experiment 2,504 suckling cows received the same treatment described in Experiment 1, but insemination was performed as follows: Group EB8-AI48h (G-EB8-AI48h; n = 119) and Group EB8-AI54h (G-EB8-AI54h; n = 134) received 1 mg of EB on Day 8 and FrAI was performed, respectively, 48 or 54 h after P4 device removal. Group EB9-AI48h (G-EB9-AI48h; n = 126) and Group EB9-AI54h (G-EB9-AI54h n = 125) received the same treatments and underwent the same FTAI protocols as G-EB8-AI48h and G-EB8-AI54h, respectively; however, EB was administered on Day 9. Conception rates were greater (P < 0.05) in G-EB9-AI54h 163.2% (79/125) a], G-EB9-AI48h [58.7% (74/126) a] and G-EB8-AI48h [58.8% (70/119) a] than in G-EB8-AI54h [34.3% (46/134) b]. We concluded that when EB administration occurred at device withdrawal (D8), the interval to ovulation shortened and dominant and ovulatory follicle diameters decreased. Furthermore, when EB treatment was performed 24 h after device removal, FTAI conducted at either 48 or 54 h resulted in similar conception rates. However, EB treatment on the same day as device withdrawal resulted in a lesser conception rate when FTAI was conducted 54 h after device removal. (C) 2007 Elsevier B.V. All rights reserved. | en |
dc.description.sponsorship | Fazenda Santa Barbara | - |
dc.description.sponsorship | Pocos de Caldas/MG | - |
dc.description.sponsorship | Fazenda Santa Eliza | - |
dc.description.sponsorship | Campo Grande | - |
dc.description.sponsorship | Tecnopec Cons C. R. Ltda | - |
dc.format.extent | 77-87 | - |
dc.language.iso | eng | - |
dc.publisher | Elsevier B.V. | - |
dc.source | Web of Science | - |
dc.subject | Cattle-fixed-time artificial insemination | en |
dc.subject | Follicular dynamics | en |
dc.subject | ovulation | en |
dc.subject | Pregnancy | en |
dc.subject | Estradiol benzoate | en |
dc.title | Effect of timing of estradiol benzoate administration upon synchronization of ovulation in suckling Nelore cows (Bos indicus) treated with a progesterone-releasing intravaginal device | en |
dc.type | outro | - |
dc.contributor.institution | Universidade de São Paulo (USP) | - |
dc.contributor.institution | Universidade Estadual Paulista (UNESP) | - |
dc.contributor.institution | Tecnopec Cons CR Ltda | - |
dc.description.affiliation | FMVZ USP, Dept Anim Reprod, BR-05508000 São Paulo, Brazil | - |
dc.description.affiliation | FCAV UNESP, Dept Med Vet Prevent & Reprod Anim, BR-14850000 Jaboticabal, SP, Brazil | - |
dc.description.affiliation | Tecnopec Cons CR Ltda, BR-04379020 São Paulo, Brazil | - |
dc.description.affiliationUnesp | FCAV UNESP, Dept Med Vet Prevent & Reprod Anim, BR-14850000 Jaboticabal, SP, Brazil | - |
dc.identifier.doi | 10.1016/j.anireprosci.2007.12.001 | - |
dc.identifier.wos | WOS:000261270000007 | - |
dc.rights.accessRights | Acesso restrito | - |
dc.relation.ispartof | Animal Reproduction Science | - |
Appears in Collections: | Artigos, TCCs, Teses e Dissertações da Unesp |
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