The use of hormonal treatments to improve reproductive performance of anestrous beef cattle in tropical climates

Baruselli, Pietro Sampaio; Reis, E. L; Marques, MG; Nasser, L.F.; Bó, G. A.

doi:10.1016/j.anireprosci.2004.04.025

Cited by 351 publications

(311 citation statements)

References 27 publications

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“…Follicle and CL size were also positive related (Wecker et al 2012), but no interference in fertility was noted. In the present study, no relationship between CL size with fertility was noted, similarly as observed by Nuñes et al (2011), although disagreeing with findings from Baruselli et al (2003), Baruselli et al (2004) and Sá Filho et al (2010a, 2010b, 2010c.…”

Section: Discussioncontrasting

confidence: 49%

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: Discussioncontrasting

confidence: 49%

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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“…This effect has been observed by other authors (Baruselli et al 2004;Lopes et al 2007). Injection of 400 IU of eCG in 90 Nelore heifers presented a preovulatory follicle growth rate of 1.1±0.1 mm/day, while this was 0.6 ±0.1 mm/day in the 87 animals in the control group (Sà Filho et al 2010b).…”

Section: Discussionsupporting

confidence: 87%

“…Animals injected with eCG (300 IU) present a greater ovulating follicle diameter (10.1±1.4 mm) than the control group (9.3±1.2 mm). Similar differences were observed after injection of 400 IU of eCG in Nelore cows (Bos indicus) (11.2 ±0.9 mm vs. 9.4±1.1 mm) (Sà Filho et al 2010a) This is lower than the diameters observed by several authors after injecting 400 IU of eCG in Nelore cattle: 10.6±0.2 mm, 11.2±0.9 and 12.55±0.36 mm (Baruselli et al 2004;Sà Filho et al 2010a, c), or Senepol cattle: 13.6±0.4 mm (Alvarez et al 2000). These differences could be attributed to speculation and therefore the different physiological statuses of the B. taurus breeds.…”

Section: Discussionsupporting

confidence: 83%

“…Intervals of 72.9±2.1 h and 70.5± 2.7 h were observed after dairy cattle were treated with a CIDR® and 400 IU of eCG (Souza et al 2009) and Nelore cattle treated using a norgestomet implant and 400 IU of eCG (Sà Filho et al 2010a). Injection of 400 IU of eCG did not lead to significant differences in this interval in Nelore cows treated using progesterone, 74.2±4.0 h in treated cattle compared to 78.0±3.1 h in cows in the control group (Baruselli et al 2004). Increasing the dose of eCG (from 400 to 600 IU) did not lead to significant differences in the interval between treatment and ovulation in Holstein cattle.…”

Section: Discussionmentioning

confidence: 73%

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Preovulatory follicle diameter, growth rate and time of ovulation during induced oestrus using a CIDR® in trypanotolerant female Bos taurus N’Dama cattle

Okouyi

Drion

Hanzen

2015

Trop Anim Health Prod

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The aim of this study was to assess the dose (300 to 600 IU) effects of equine chorionic gonadotropin (eCG) on the preovulatory follicle diameter, growth rate and time of ovulation characterized by echography. The eCG was injected at the end (D 0 ) of the 7-day treatment with a controlled internal device release (CIDR®) and a PGF 2α being injected 2 days before the removal of the CIDR® (d −2 ). The 120 N'Dama female were distributed into five experimental groups. The control group (n=26) was treated with physiological saline at the removal of the CIDR®, while the animals in the four treated groups received, respectively, 300 IU (n=25), 400 IU (n=24), 500 IU (n=22) and 600 IU (n=23) of eCG. The diameter of the preovulatory follicle was significantly higher (P<0.05) in the animals treated with 300 IU (10.1±1.4 mm) than in untreated animals (9.3±1.2 mm). Follicle growth rate was significantly (P<0.05) higher in treated animals (1.0± 0.4 mm/day) than in the control group (0.9±0.4 mm/day). The average interval between the time of eCG injection and ovulation was similar in the non-treated (83.7±14.4 h) and treated animals (79.7±11.9). Treated animals showed a significant increase in the percentage of ovulation (94.7 % compared to 73.1 %) (P<0.01). Use of eCG contributed towards synchronising the time of ovulation between 72 to 96 h, which would facilitate the use of systematic insemination.

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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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The use of hormonal treatments to improve reproductive performance of anestrous beef cattle in tropical climates

Cited by 351 publications

References 27 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

Preovulatory follicle diameter, growth rate and time of ovulation during induced oestrus using a CIDR® in trypanotolerant female Bos taurus N’Dama cattle

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

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