LH surge in Nelore cows (Bos indicus), after induced estrus or after ovarian superestimulation

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorMonteiro, Fabio Morato
dc.creatorMelo, Danilas Salinet
dc.creatorFerreira, Marcelo Machado G.
dc.creatorCarvalho, Luciano Mundim
dc.creatorSartoreli, Evandro Sartoreli e
dc.creatorEderhardt, Bruno G.
dc.creatorNogueira, Guilherme de Paula
dc.creatorBarros, Ciro Moraes
dc.date2014-05-27T11:23:50Z
dc.date2016-10-25T18:26:45Z
dc.date2014-05-27T11:23:50Z
dc.date2016-10-25T18:26:45Z
dc.date2009-01-01
dc.date.accessioned2017-04-06T01:35:06Z
dc.date.available2017-04-06T01:35:06Z
dc.identifierAnimal Reproduction Science, v. 110, n. 1-2, p. 128-138, 2009.
dc.identifier0378-4320
dc.identifierhttp://hdl.handle.net/11449/70880
dc.identifierhttp://acervodigital.unesp.br/handle/11449/70880
dc.identifier10.1016/j.anireprosci.2008.01.003
dc.identifier2-s2.0-55249107596
dc.identifierhttp://dx.doi.org/10.1016/j.anireprosci.2008.01.003
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/891945
dc.descriptionConsidering that there is limited information about the preovulatory LH surge in Zebu cattle (Bos indicus), the purpose of the present work was to assess the LH surge in Nelore cows during the estrous cycle and after ovarian superestimulation of ovarian follicular development with FSH. This information is particularly important to improve superovulatory protocols associated with fixed-time artificial insemination. Nelore cows (n = 12) had their estrus synchronized with an intravaginal device containing progesterone (CIDR-B ®) associated with estradiol benzoate administration (EB, 2.5 mg, i.m., Day 0). Eight days later all animals were treated with PGF2α (Day 8) in the morning (8:00 h) and at night, when CIDR devices were removed (20:00 h). Starting 38 h after the first PGF2α injection, blood sampling and ovarian ultrasonography took place every 4 h, during 37 consecutive hours. Frequent handling may have resulted in a stress-induced suppression of LH secretion resulting in only 3 of 12 cows having ovulations at 46.7 ± 4.9 and 72.3 ± 3.8 h, respectively, after removal of CIDR-B. Thirty days later, the same animals received the described hormonal treatment associated with FSH (Folltropin ®, total dose = 200 mg) administered twice a day, during 4 consecutive days, starting on Day 5. Thirty-six hours after the first injection of PGF2α, to minimize stress, only seven blood samples were collected at 4 h interval each, and ultrasonography was performed every 12 h until ovulation. In 11 of 12 cows (92%) the LH surge and ovulation were observed 34.6 ± 1.6 and 59.5 ± 1.9 h, respectively, after removal of progesterone source. The maximum values for LH in those animals were 19.0 ± 2.6 ng/ml (mean ± S.E.M.). It is concluded that, in Nelore cows submitted to a ovarian superstimulation protocol, the LH surge occurs approximately 35 h after removal of intravaginal device containing progesterone, and approximately 12 h before the LH surge observed after an induced estrus without ovarian superstimulation. © 2008 Elsevier B.V. All rights reserved.
dc.languageeng
dc.relationAnimal Reproduction Science
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectBos indicus
dc.subjectEstrous cycle
dc.subjectLH
dc.subjectSuperovulation
dc.subjectZebu cattle
dc.subjectcloprostenol
dc.subjectdrug derivative
dc.subjectestradiol
dc.subjectestradiol 3-benzoate
dc.subjectestradiol benzoate
dc.subjectluteinizing hormone
dc.subjectluteolytic agent
dc.subjectprogesterone
dc.subjectanimal
dc.subjectanimal disease
dc.subjectblood
dc.subjectcattle
dc.subjectdrug effect
dc.subjectechography
dc.subjectestrus
dc.subjectestrus cycle
dc.subjectfemale
dc.subjectmethodology
dc.subjectovary follicle
dc.subjectovulation induction
dc.subjectphysiology
dc.subjectsuperovulation
dc.subjectAnimals
dc.subjectCattle
dc.subjectCloprostenol
dc.subjectEstradiol
dc.subjectEstrus
dc.subjectEstrus Synchronization
dc.subjectFemale
dc.subjectLuteinizing Hormone
dc.subjectLuteolytic Agents
dc.subjectOvarian Follicle
dc.subjectOvulation Induction
dc.subjectProgesterone
dc.subjectAnimalia
dc.subjectBos
dc.titleLH surge in Nelore cows (Bos indicus), after induced estrus or after ovarian superestimulation
dc.typeOtro


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