Ovarian follicle diameter at timed insemination and estrous response influence likelihood of ovulation and pregnancy after estrous synchronization with progesterone or progestin-based protocols in suckled Bos indicus cows

Filho, Manoel Francisco de Sá; Crespilho, André Maciel; Santos, J.E.P.; Perry, George A.; Baruselli, Pietro Sampaio

doi:10.1016/j.anireprosci.2010.03.007

Cited by 177 publications

(125 citation statements)

References 29 publications

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“…Subjective and objective methods are validated and can be used to measure follicular vascularity in cows and mares (Ginther et al 2007). Previous works showed that follicles with greater diameter resulted in also greater pregnancy rates (Sá Filho et al 2010a). Furthermore, preovulatory follicles with greater size originated CLs with greater size and presenting higher production of progesterone (Bisinotto et al 2012, Machado et al 2008.…”

Section: Introductionmentioning

confidence: 97%

“…Early gestational diagnosis had aimed to improve herd production, since it could enable an early reintroduction of the non--pregnant cows in reproduction, and an increased number of pregnant animals in a shorter time. In addition, real time methods to predict fertility at the time of AI and ET procedure were also previously tested (Silva et al 2006, Siddiqui et al 2008, Sá Filho et al 2010a. Therefore, an immediate diagnosis to help the decision of using or discarding an animal from an AI or ET program is still questionable.…”

Section: Introductionmentioning

confidence: 99%

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Follicle and corpus luteum size and vascularity as predictors of fertility at the time of artificial insemination and embryo transfer in beef cattle

et al. 2015

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Abstract:Two ultrasound based fertility prediction methods were tested prior to embryo transfer (ET) and artificial insemination (AI) in cattle. Female bovines were submitted to estrous synchronization prior to ET and AI. Animals were scanned immediately before ET and AI procedure to target follicle and corpus luteum (CL) size and vascularity. In addition, inseminated animals were also scanned eleven days after insemination to target CL size and vascularity. All data was compared with fertility by using gestational diagnosis 35 days after ovulation. Prior to ET, CL vascularity showed a positive correlation with fertility, and no pregnancy occurred in animals with less than 40% of CL vascularity. Prior to AI and also eleven days after AI, no relationship with fertility was seen in all parameters analyzed (follicle and CL size and vascularity), and contrary, cows with CL vascularity greater than 70% exhibit lower fertility. In inseminated animals, follicle size and vascularity was positive related with CL size and vascularity, as shown by the presence of greater CL size and vascularity originated from follicle with also greater size and vascularity. This is the first time that ultrasound based fertility prediction methods were tested prior to ET and AI and showed an application in ET, but not in AI programs. Further studies are needed including hormone profile evaluation to improve conclusion.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Follicle and corpus luteum size and vascularity as predictors of fertility at the time of artificial insemination and embryo transfer in beef cattle

et al. 2015

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“…Além disto, o maior tamanho do FO está correlacionado com a concentração sérica de estradiol, a manifestação de estro, a taxa de ovulação e com o sucesso na concepção [11]. A indução da ovulação de folículos dominantes pequenos, com diâmetro menor que 11 mm, está associada a menores taxas de prenhez e maiores perdas gestacionais em novilhas [11] e vacas de corte [14,15]. Novilhas que apresentam folículos menores que 10,7 mm ou maiores que 15,7 mm no momento da inseminação possuem menor chance de conceber quando comparadas àquelas com FO de 12,8 mm de diâmetro na IA [13].…”

Section: Discussionunclassified

“…O desenvolvimento de um FO pequeno também está associado a reduzida concentração sérica de estradiol durante o período peri-ovulatório e menores níveis de progesterona durante a fase luteal subsequente [9,11,19]. O aumento nas concentrações séricas de estradiol é um indicativo de maior maturidade fisiológica do FO e, no momento da ovulação, desempenha um importante papel nos eventos relacionados ao estabelecimento da prenhez [11,15].…”

Section: Discussionunclassified

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Inﬂuence of Follicular Growth Stimulation on Fertility of Beef Cows Treated with eCG or FSH in FTAI Protocols

Thedy

Berlitz

Oliveira

et al. 2018

Acta Scientiae. Vet.

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Background:The pregnancy rate in fixed-time insemination (FTAI) programs in beef cattle is affected by several factors, including the size of ovulatory follicle (OF). Induced ovulation of small OF (≤11 mm) reduces the chance of pregnancy after FTAI when compared to ovulation of larger follicles (≥12 mm). Hormonal treatments to enhance the follicle growth have been widely used in comercial beef cattle systems, aiming to improve the development of a dominant follicle. The objective of this experiment was to evaluate the effect of treatment with eCG or FSH at the time of progesterone implant removal on the diameter of OF, final follicle growth and pregnancy rate in beef cows. Materials, Methods & Results: Three hundred and seven suckled beef cows with body condition score 2.80 ± 0.24 (1 to 5 scale) and 45 to 70 days postpartum were synchronized to FTAI. On day 0, intravaginal implants containing 1 g of progesterone, were inserted and administered 2 mg of estradiol benzoate (EB), i.m. On day 7, intravaginal implants were

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Comparison of follicular development, timing of ovulation and serum progesterone, estradiol and luteinizing hormone concentrations in dairy heifers treated with 4‐ or 5‐day CoSynch + CIDR protocols

Fishman‐Holland

Stoskute

Ferrer

et al. 2019

Veterinary Medicine & Sci

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The use of 4‐day CoSynch + Controlled internal drug release (CIDR) + timed artificial insemination (TAI) in dairy heifers has resulted in adequate pregnancy rates compared with the 5‐day CoSynch + CIDR + TAI protocol. The objective of this study was to compare follicular growth, timing of ovulation and serum progesterone (P4), estradiol (E2) and luteinizing hormone (LH) concentrations in dairy heifers treated with modified 4‐ or 5‐day CoSynch + CIDR protocols (CIDR for 4 or 5 days, PGF2α at CIDR removal and GnRH + TAI 72 h later). Twelve cycling Holstein heifers were randomly assigned to either the 4‐ or 5‐day Co‐Synch+CIDR (n = 6/treatment) to receive an intravaginal insert CIDR® containing 1.38 g of P4 for 4 or 5 days, respectively. At CIDR removal, 25 mg of PGF2α was injected IM; 72 h after CIDR removal, heifers received 100 μg of GnRH IM and timed artificial insemination (TAI). Follicular growth and timing of ovulation were assessed using transrectal ultrasonography. Blood samples were collected at the time of CIDR insertion and at frequent time points after CIDR removal for determination of P4 (at TAI), E2 (every 12 h) and LH (every 6 h during the first and second day and every 2 h on the third day). Heifers in the 4‐day group had smaller follicles from CIDR insert removal to ovulation compared with heifers in the 5‐day treatment. Five of six heifers (83.3%) in the 4‐day treatment ovulated at 90–96 h post CIDR insert removal, whereas most heifers in the 5‐day treatment (4/6; 66.6%) ovulated at 84–90 h post CIDR insert withdrawal. Heifers in the 5‐day treatment reached greater peak LH concentration between 48 and 72 h after CIDR insert removal and lesser E2 concentration at TAI than heifers in the 4‐day treatment. In conclusion, heifers in the 4‐day treatment had smaller follicular diameter at 0, 30, 36, 42 and 48 h after CIDR insert removal, longer interval from CIDR insert removal to ovulation, greater E2 concentrations at TAI, and lesser peak LH concentration than heifers in the 5‐day treatment. These results represent a baseline for further studies to determine if prolonging the interval to TAI by 6 h in the 4‐day CoSynch+CIDR would improve pregnancy risk.

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Ovarian follicle diameter at timed insemination and estrous response influence likelihood of ovulation and pregnancy after estrous synchronization with progesterone or progestin-based protocols in suckled Bos indicus cows

Cited by 177 publications

References 29 publications

Follicle and corpus luteum size and vascularity as predictors of fertility at the time of artificial insemination and embryo transfer in beef cattle

Follicle and corpus luteum size and vascularity as predictors of fertility at the time of artificial insemination and embryo transfer in beef cattle

Inﬂuence of Follicular Growth Stimulation on Fertility of Beef Cows Treated with eCG or FSH in FTAI Protocols

Comparison of follicular development, timing of ovulation and serum progesterone, estradiol and luteinizing hormone concentrations in dairy heifers treated with 4‐ or 5‐day CoSynch + CIDR protocols

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