Pattern and manipulation of follicular development in Bos indicus cattle

Bó, G. A.; Baruselli, Pietro Sampaio; Martı́nez, M.F.

doi:10.1016/s0378-4320(03)00097-6

Cited by 286 publications

(155 citation statements)

References 75 publications

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“…Additionally, the use of eCG led to improve follicular development, increasing the P 4 concentration in the luteal phase after ovulation (Sá Filho and Vasconcelos 2010). By application of eCG, B. indicus cows with small or medium follicle sizes, presented better PR (Cutaia et al 2003;Baruselli et al 2004), and ovarian cyclicity was induced, even when affected by nutritional factors (Bó et al 2003), or under BCS adverse conditions (hard ovaries and small follicles) after delivery. In the present study the cows carried average BCS of 2.8.…”

Section: Resultsmentioning

confidence: 99%

Impact of Equine Chorionic Gonadotropin Associated with Temporary Weaning, Estradiol Benzoate, or Estradiol Cypionate on Timed Artificial Insemination in Primiparous Bos Indicus Cows

Souza

Segui

Kozicki

et al. 2016

Braz. arch. biol. technol.

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Section: Resultsmentioning

confidence: 99%

Impact of Equine Chorionic Gonadotropin Associated with Temporary Weaning, Estradiol Benzoate, or Estradiol Cypionate on Timed Artificial Insemination in Primiparous Bos Indicus Cows

Souza

Segui

Kozicki

et al. 2016

Braz. arch. biol. technol.

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“…Entre as possíveis causas para estes resultados, pode-se considerar que a boa condição corporal das vacas no período experimental influenciou positivamente tanto ao grupo de fêmeas tratadas com FSH como as não tratadas. Resultados semelhantes a estes foram relatados por Bó et al [3] que atribuíram maiores taxas de prenhez em vacas com baixo escore de condição corporal tratadas eCG quando comparadas com as não tratadas. Ainda segundo estes autores, entre os benefícios da administração do eCG em vacas de corte com baixa condição corporal estão a redução do anestro no pós-parto, maior crescimento folicular, maiores taxas de ovulação e de concepção.…”

Section: Discussionunclassified

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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“…Bovine females are seasonally polyoestrous with a 21±3 days oestrous cycle length (Savio et al, 1990, Peter et al, 2009, Forde et al, 2011b. The oestrous cycle length is similar in B. indicus and B. taurus breeds (Bó et al, 2003) and generally is longer in adult cows than young heifers (23 vs. 20.8 days; respectively P< 0.05) (Sartori et al, 2004).The length of the cycle depends on the number of waves of follicular growth (2 to 4). Most commonly, heifers and cows have two to three waves of follicular growth during the oestrous cycle.…”

Section: Bovine Oestrous Cyclementioning

confidence: 99%

63 Effect of Endometrial Biopsy on Uterine Health of Tropically Adapted Beef Cattle

Ramirez-Garzon

Satake

Lyons

et al. 2017

Reprod. Fertil. Dev.

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In cattle, early embryonic loss during the first two to three weeks after fertilisation is recognised as the major cause of reproductive failure, with consequent significant impacts on business performance of beef and dairy farms. Inadequate endometrial receptivity is considered an important cause of early embryonic mortality in cattle. A pilot experiment was conducted to compare the outcome of performing different endometrial sampling procedures in tropically adapted (Bos indicus x Bos taurus) heifers, and to select the most suitable method to collect samples for investigation of endometrial gene expression. Endometrial biopsy (EB) using a biopsy device with a diameter similar to an artificial insemination gun (10366L Karl Storz®, Germany) was found to be the most reliable method of collecting endometrial samples in these heifers, with the samples recovered yielding a mean concentration of RNA of 72.9 ±39.3 ng/µl and mean RNA integrity number (RIN) of 7.3 ±1.1.To assess the likely safety of conducting EB in cattle a systematic review of published information assessing the impact of EB on subsequent pregnancy rates was conducted. Using the Preferred Reporting Items for Systematic reviews and Meta-Analysis (PRISMA) protocol, online searches identified 1164 possible studies. After applying the exclusion criteria, six studies allowed the comparison of pregnancy rates between sampled (n= 1,208) and non-sampled cows (n=2,393). The results showed that EB can be performed before breeding without adversely affecting the likelihood of cows becoming pregnant.A major objective of the research was to determine whether EB and evaluation of endometrial gene expression could be used to identify tropically adapted embryo transfer (ET) recipients more likely to become pregnant. Three potential EB scenarios were investigated, 1) EB on Day 7 of the oestrous cycle prior to the cycle when ET would be performed, 2) EB on Day 4 of the oestrous cycle in which ET would be performed i.e. EB 3 days before ET, and 3) EB on the same day when ET would be performed.The first study assessed the morphological and inflammatory changes induced by endometrial biopsy. Pre-synchronised heifers underwent EB from the horn ipsilateral to the corpus luteum (CL) either at Day 7 of the previous cycle (Group 1 n=10) followed by administration of a luteolytic dose of prostaglandin F2α or at Day 4 (Group 2, n=7) of the present cycle. All heifers were slaughtered on Day 7 of the present cycle. The site of EB was visually evident in 40% (4/10) of Group 1 and 42% (3/7) of Group 2 heifers. Histological assessment revealed no evidence of changes indicative of endometritis in either the biopsied or non-biopsied horns in both groups. The histological iii changes observed included mild mononuclear infiltration of the epithelium and mild vascular changes associated with haemorrhage and congestion.Initial investigation of the endometrial expression of the pro-inflammatory cytokine IL1β and wound healing cytokine TGFβ genes found no significant difference betwe...

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Pattern and manipulation of follicular development in Bos indicus cattle

Cited by 286 publications

References 75 publications

Impact of Equine Chorionic Gonadotropin Associated with Temporary Weaning, Estradiol Benzoate, or Estradiol Cypionate on Timed Artificial Insemination in Primiparous Bos Indicus Cows

Impact of Equine Chorionic Gonadotropin Associated with Temporary Weaning, Estradiol Benzoate, or Estradiol Cypionate on Timed Artificial Insemination in Primiparous Bos Indicus Cows

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

63 Effect of Endometrial Biopsy on Uterine Health of Tropically Adapted Beef Cattle

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