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dc.contributor.authorPFEIFER, L. F. M.pt_BR
dc.contributor.authorLEAL, S. del C. B. de S.pt_BR
dc.contributor.authorSCHNEIDER, A.pt_BR
dc.contributor.authorSCHMITT, E.pt_BR
dc.contributor.authorCORRÊA, M. N.pt_BR
dc.date.accessioned2013-02-22T11:11:11Zpt_BR
dc.date.available2013-02-22T11:11:11Zpt_BR
dc.date.created2013-02-22pt_BR
dc.date.issued2012pt_BR
dc.identifier.citationRevista Brasileira de Zootecnia, Botucatu, v. 41, n. 4, p. 1004-1008, 2012.pt_BR
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/950614pt_BR
dc.descriptionThe objective of this study was to evaluate the influence of the ovulatory follicle diameter on the reproductive performance of lactating beef cows subjected to low progesterone fixed-time artificial insemination (FTAI) protocols. Ninety-three lactating beef cows (60-80 days postpartum) at random stages of estrous cycle were given a luteolytic dose of prostaglandin F2α (500 μg cloprostenol; PGF) twice, 11 d apart. Ten days after the second PGF treatment, cows were given 1.5 mg of estradiol benzoate im and a progesterone-releasing intravaginal device (Cue-Mate) with a single pod containing 0.78 g progesterone (Day 0). Cows received another luteolytic dose of PGF on Day 0. On Day 8, the Cue-Mate was removed. Fifty-four to 56 hours later, cows received 12.5 mg of porcine LH (pLH) i.m. and were concurrently artificially inseminated. Ultrasound examinations of the ovaries were performed on Days 10 and 17 to evaluate the diameter of ovulatory follicle and corpus luteum, respectively. Cows which presented ovulatory follicle > 19 mm resulted in larger corpus luteum than cows that had ovulatory follicle <15 mm in diameter. However, cows with ovulatory follicle between 13-15 mm had higher pregnancy rate than other categories of ovulatory follicle. Although larger ovulatory follicles result in larger corpus luteum and consequently higher progesterone production, the optimal size of ovulatory follicles (13-15 mm) may result in positive benefits on pregnancy rate for cows subjected to FTAI with low progesterone concentration protocols.eng
dc.language.isoengeng
dc.rightsopenAccesseng
dc.subjectFertilitypt_BR
dc.subjectPost-partum cowspt_BR
dc.titleEffect of ovulatory follicle diameter and progesterone concentration on the pregnancy rate of fixed-time inseminated lactating beef cows.pt_BR
dc.typeArtigo de periódicopt_BR
dc.date.updated2013-02-22T11:11:11Zpt_BR
dc.subject.nalthesauruscorpus luteumpt_BR
dc.subject.nalthesaurusprogesteronept_BR
riaa.ainfo.id950614pt_BR
riaa.ainfo.lastupdate2013-02-22pt_BR
dc.contributor.institutionLUIZ FRANCISCO MACHADO PFEIFER, CPAF-ROpt_BR
dc.contributor.institutionSOFIA DEL CARCARMEN BONILLA DE SOUZA LEAL, UNIVERSIDADE FEDERAL DE PELOTASeng
dc.contributor.institutionAUGUSTO SCHNEIDER, UNIVERSIDADE FEDERAL DE PELOTASeng
dc.contributor.institutionEDUARDO SCHMITT, UNIVERSIDADE FEDERAL DE PELOTASeng
dc.contributor.institutionMARCIO NUNES CORRÊA, UNIVERSIDADE FEDERAL DE PELOTAS.eng
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