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| Registros recuperados: 11 | |
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| OLIVEIRA JUNIOR, J. S. de; SILVA, G. M. da; MOREIRA, E. M.; ANDRADE, J. de S.; NUNES, V. R. R.; MOROTTI, F.; ANDRADE, E. R.; SENEDA, M. M.; PFEIFER, L. F. M.. |
| This study aimed to establish the relationship between antral follicle count (AFC), the time of puberty, and ovarian response in Nelore heifers subjected to timed-AI (TAI) protocols. Prepubescent Nelore heifers (Bos indicus; n = 30) were examined by transrectal ultrasound and videos of the ovaries were recorded for later CFA (? 3 mm). After AFC, heifers were divided into 2 groups, low and high AFC and then further ultrasonic ovarian assessments were performed to determine the onset of puberty. Once puberty was established in all heifers, they were submitted to an FTAI protocol. There were no differences (P > 0.1) between groups on the time of puberty, ovulation rate, the proportion of heifers that expressed estrus, and on preovulatory follicle diameter.... |
| Tipo: Artigo de periódico |
Palavras-chave: Folículos antrais; Antral follicles.; Gado Nelore; Ovulação; Melhoramento Genético Animal.; Novilho de Corte; Reprodução Animal; Ciclo Estral; Animal breeding.; Estrous cycle; Ovulation; Nellore; Heifers; Animal reproduction. |
| Ano: 2022 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1143673 |
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| OLIVEIRA JUNIOR, J. S. de; SILVA, G. M. da; MOREIRA, E. M.; NUNES, V. R. R.; MOROTTI, F.; ANDRADE, E. R.; SENEDA, M. M.; PFEIFER, L. F. M.. |
| Esse estudo teve como objetivo determinar o efeito da contagem de folículos antrais (CFA) e da maturidade sexual na fertilidade de novilhas de corte. Neste estudo, 230 novilhas Nelore, com 20 ± 2 meses de idade, foram submetidas a um protocolo de inseminação em tempo-fixo (IATF) a base de estradiol e progesterona. No Dia 0 do protocolo de IATF as novilhas foram examinadas por ultrassonografia transretal e vídeos dos ovários foram gravados para posterior CFA (≥ 3 mm) realizada na sala escura do laboratório de imagens. Trinta dias após a ultrassonografia, as fêmeas que falharam na primeira IATF foram ressincronizadas com o mesmo protocolo hormonal. A prenhez foi avaliada por ultrassonografia 30 dias após cada IATF. A média geral da CFA foi de 22... |
| Tipo: Artigo de periódico |
Palavras-chave: Bos Indicus; Cattle; Ovulation; Pregnancy. |
| Ano: 2022 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1152395 |
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| CASTRO, N. A. de; LEONARDI, C. E. P.; SINGH, J.; SCHNEIDER, A.; GONÇALVES, P. B.; OLIVEIRA, F. C.; D'ÁVILA, C. A.; FERREIRA, R.; GASPERIN, B. G.; MOREIRA, E. M.; ANDRADE, J. de S.; PFEIFER, L. F. M.. |
| This study aimed to evaluate the role of prostaglandin F2a (PGF) on ovulation. In Experiment 1, cows were randomly allocated to two treatments to receive 150 ug of d-Cloprostenol (PGF Group, n = 12) or 2 mL of NaCl 0.9% (Control Group, n = 11) and CIDRs, were removed 4 days later. No cow ovulated in Control and PGF groups. In Experiment 2, cows were randomly separated into two experimental groups to receive 4 injections of 150 ug of d-Cloprostenol (n = 9) or 2 mL of NaCL 0.9% (n = 9). In this experiment, ovulation was not observed in any cows. In Experiment 3, ovariectomized cows receive three injections of 300ug of PGF analog (PGF Group, n = 5), 100ug of Lecirelin (GnRH Group, n = 5) or 2 mL of PBS (Control Group, n = 4). The LH concentration was higher... |
| Tipo: Artigo de periódico |
Palavras-chave: F2a; Reprodução Animal; Vaca; Ovulação; Prostaglandina; Animal reproduction; Cows; Ovulation; Prostaglandins. |
| Ano: 2021 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1131796 |
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| PFEIFER, L. F. M.; ANDRADE, J. de S.; MOREIRA, E. M.; SILVA, R. R. da; NEVES, P. M. A.; SILVA, G. M. da S.; LEMOS, I. C.; SCHNEIDER, A.. |
| The aim of this study was to evaluate the uterine health and fertility of postpartum beef cows subjected to timed AI (TAI) protocols at different days from calving. Lactating Nelore cows (Bos indicus; n = 244) were used in this study. The TAI protocols were initiated between 20 and 60 days postpartum (DPP). Cows were subjected to an estradiol-progesterone based TAI protocol. The cows were divided into three groups according to the days postpartum at the time the hormonal treatment was initiated: 1) Early (n = 64), cows between 20 and 30 DPP; 2) Middle (n = 115), cows between 31 and 45 DPP; and 3) Late (n = 65), cows between 46 and 60 DPP. At Day 0 of the protocol, endometrial cytobrush samples were collected. Slides for polymorphonuclear (PMN) cell... |
| Tipo: Artigo de periódico |
Palavras-chave: Cytobrush; PMN cell; Células polimorfonucleares; Fertilidade uterina; Bovino de corte; Fertilidade Animal; Calving; Cytokines. |
| Ano: 2018 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1095927 |
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| Registros recuperados: 11 | |
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