Ovarian dynamics following ultrasound-guided transvaginal follicle ablation in cyclic heifers

Bergfelt, D.R.; Lightfoot, K.; Adams, Gregg P.

doi:10.1016/s0093-691x(05)80071-8

Cited by 22 publications

(10 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…One approach to control follicular development in a group of cattle is to synchronously induce atresia of the dominant follicles (DFs). Removal of the functional DF causes an increase in follicle-stimulating hormone (FSH) that drives recruitment of a new cohort of follicles (Adams et al 1992, Bergfelt et al 1994. Oestradiol-17b (Bo et al 1995) or conjugated forms of oestradiol (Thundathil et al 1998, Day & Burke 2002 have been used effectively for this purpose.…”

Section: Introductionmentioning

confidence: 99%

Histological and steroidogenic changes in dominant ovarian follicles during oestradiol-induced atresia in heifers

et al. 2005

View full text Add to dashboard Cite

Histological and steroidogenic changes within dominant ovarian follicles (DFs) undergoing atresia following systemic administration of oestradiol benzoate (ODB) were characterized in beef heifers. At 5.6 6 0.1 days after the onset of oestrus, heifers received 1 mg ODB i.m./500 kg body weight (ODB; n 5 15) or served as controls (n 5 15). Timing of treatment initiation was designated as hour (h) 0 on day (d) 0, and coincided with the presence of the DF of the first follicular wave (DF1). Within treatments, the DF1 was collected following ovariectomy in four animals at h 12, h 36 or after ultrasonic detection of a new wave (NW) of ovarian follicular development. In heifers of the NW groups (n 5 7 per treatment), blood samples were collected at intervals of 20 min for 12 h beginning at h 2 12, 0, 24 and 48 to characterize circulating LH patterns. Administration of ODB suppressed (P < 0.01) mean concentrations of LH at h 24 and h 48 by preventing (P < 0.05) the increase in LH pulse amplitude observed in controls, but had no effect on FSH. Follicular fluid (FF) concentrations of androgens and oestradiol were reduced at h 36 in the ODB-treated group. The diameter of the DF1 and the number of granulosa cell layers were also reduced in ODB-treated as compared with control heifers. Treatment differences were not observed in the proportion of apoptotic granulosa cells as assessed using the TUNEL assay method, and timing of a new wave of follicular development (d 4.6 6 0.2) was similar (P > 0.1) among treatments. A prominent characteristic of oestradiol-induced atresia of the DF1 of the oestrous cycle in heifers was a loss in oestrogenic function associated with reduced LH support. However, the timing of new follicular development may be influenced by a factor(s) other than the status of the DF undergoing oestradiol-induced atresia.Reproduction (2005) 129 611-620

show abstract

Section: Introductionmentioning

confidence: 99%

Histological and steroidogenic changes in dominant ovarian follicles during oestradiol-induced atresia in heifers

et al. 2005

View full text Add to dashboard Cite

show abstract

“…Entre estes se pode citar métodos mecânicos, como remoção física do folículo dominante (BERGFELT et al, 1994;MARTINEZ et al, 2000) e métodos farmacológicos como o GnRH (PURSLEY et al, 1995) ou a associação de estrógeno e progesterona/progestágenos (BO et al, , 1995.…”

Section: Controle Da Dinâmica Folicularunclassified

Biotechnology reproductive and physiology reproductive female bovine - knowledge for success

Santos¹,

Santos²,

Costa³

et al. 2015

Pubvet

View full text Add to dashboard Cite

ResumoAs biotecnologias buscam a eficiência reprodutiva dos rebanhos bovinos.Destas as mais utilizadas com sucesso são a inseminação Artificial (IA) e transferência de embriões (TE). Outras biotécnicas como a produção in vitro de embriões (PIVE) e clonagem, também contribuem para acelerar o melhoramento genético, porque incluem a utilização de animais superiores.Algumas biotecnologias utilizadas comercialmente em rebanhos leiteiros e de corte possuem limitações, dentre elas a PIVE, a qual sofre influência de vários fatores, como a taxa de recuperação oocitária e a variação individual na resposta ovariana aos tratamentos hormonais, requerendo mais estudos para avaliar o efeito da associação entre o início da onda folicular e o início do tratamento superestimulatório, tornando-se indispensável o amplo conhecimento da fisiologia reprodutiva da fêmea bovina.Palavras-chave: embriões, onda folicular, oócitos.

show abstract

“…Ultrasound guided transvaginal follicular aspiration (TVFA) in cattle has been used for oocyte collection in in vitro embryo production (ovum pick-up, OPU) (Pieterse et al 1988), dominant follicle ablation (Bergfelt et al 1994), follicular fluid collection (Vos et al 1994;Leroy et al 2004) or foetal fluid collection (Vos et al 1990;Garcia and Salaheddine 1997). After modifications to the TVFA, the equipment has also been used for intraovarian treatment (IFT) (Kot et al 1995).…”

mentioning

confidence: 99%

The introduction of a double-channel system for the intrafollicular treatment of cattle

Čech¹,

Malá²,

Indrová³

et al. 2013

Vet. Med. - Czech

View full text Add to dashboard Cite

ABSTRACT:The aim of this study was to evaluate a new double-channel system for ultrasound-guided transvaginal intrafollicular treatment in cattle. The system is equipped with separate aspiration and treatment channels facilitating the aspiration of a small part of follicular fluid followed by the immediate injection of the same amount of treatment solution. In Experiment 1 an intracystic injection was performed successfully in all cows (6/6). In Experiment 2 saline was administered to dominant follicles with an overall success rate of 87.5% (14/16). This new double-channel system represents a reliable method for intrafollicular treatment preceded by an aspiration of the necessary amount of follicular fluid without an increase in intrafollicular pressure. Keywords: transvaginal aspiration; intrafollicular injection; intracystic injection; double-channel device; cowList of abbreviations hCG = human chorionic gonadotrophine, IFT = intrafollicular treatment, LH = luteinising hormone, OPU = ovum pick up, TVFA = ultrasound guided transvaginal follicular aspiration

show abstract

Ovarian dynamics following ultrasound-guided transvaginal follicle ablation in cyclic heifers

Cited by 22 publications

References 0 publications

Histological and steroidogenic changes in dominant ovarian follicles during oestradiol-induced atresia in heifers

Histological and steroidogenic changes in dominant ovarian follicles during oestradiol-induced atresia in heifers

Biotechnology reproductive and physiology reproductive female bovine - knowledge for success

The introduction of a double-channel system for the intrafollicular treatment of cattle

Contact Info

Product

Resources

About