Effect of estradiol cypionate and amount of progesterone in the intravaginal device on synchronization of estrus, ovulation and on pregnancy rate in beef cows treated with FTAI based protocols

Uslenghi, G.; Chaves, S. González; Cabodevila, J.; Callejas, S.

doi:10.1016/j.anireprosci.2013.12.009

Cited by 13 publications

(15 citation statements)

References 31 publications

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“…On the other hand, ECP‐treated cows started to ovulate early (42 hr), which agrees with previous reports where ECP produced ovulations before 50 hr after PID removal (Colazo, Kastelic, & Mapletoft, ; Uslenghi et al., ). This determines the risk that those cows could have an aged oocyte at the time of semen arrival (Dalton and Saacke 2007, cited by Ayres et al., ) and fertilization rate can drastically decrease when AI occurs after ovulation (Roelofs et al., ).…”

Section: Discussionsupporting

confidence: 91%

“…The dominant follicle (DF) of a wave was defined as that one that reached the largest diameter (Ginther, Kastelic, & Knopf, ). The time of ovulation was defined as the average time between the last observation of the dominant follicle and the time at which the dominant follicle disappeared (ovulation), which also determined the ovulatory follicle diameter (Manes, Aller, Callejas, Hozbor, & Alberio, ; Uslenghi et al., ). On day 22 (approximately 12 days after ovulation), another ultrasound evaluation was performed to confirm ovulation by the presence of a CL (Carvalho et al., ); the CL area was measured with the ultrasound equipment's caliper system.…”

Section: Methodsmentioning

confidence: 99%

“…Currently, administration of estradiol cypionate (ECP) at PID removal is widely utilized instead of estradiol benzoate (EB) 24 hr later to reduce animal handling (Meneghetti et al., ; Peres, Claro, Sá Filho, Nogueira, & Vasconcelos, ; Sá Filho et al., ). However, in a previous study, Uslenghi, González Chaves, Cabodevila, and Callejas () demonstrated that treatment with ECP at PID removal in non‐suckled beef cows is less effective to synchronize ovulation and obtained fewer pregnancy rates than the use of EB 24 hr later as an ovulatory treatment.…”

Section: Introductionmentioning

confidence: 97%

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Effect of estradiol cypionate and GnRH treatment on plasma estradiol‐17β concentrations, synchronization of ovulation and on pregnancy rates in suckled beef cows treated with FTAI‐based protocols

Uslenghi

Vater²,

Aguilar³

et al. 2016

Reprod Domestic Animals

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Two experiments were conducted to evaluate the effect of different ovulation inducers on E-17β plasma concentrations, synchronized ovulations and pregnancy rates. In Experiment 1, cows received a progesterone intravaginal device (PID) with 1 g of progesterone (P4) plus 2 mg of estradiol benzoate (EB) (day 0). At PID removal (day 8), cows received 0.150 mg of D-cloprostenol and were randomly assigned to four treatment groups (n = 10/treatment): Group ECP: 1 mg of estradiol cypionate at PID removal, Group EB: 1 mg of EB 24 hr after PID removal, Group GnRH: 10 μg of GnRH 48 hr after PID removal, Group ECP-GnRH: 1 mg of ECP at PID removal plus 10 μg of GnRH 48 hr later. Ultrasonographic examinations were performed to detect the dominant follicle and ovulation. GnRH-treated cows ovulated later (p < .05) compared to ECP- and ECP+GnRH-treated cows. There were effects of treatment, time and their interaction on E-17β concentrations (p < .05). ECP treatment affected plasma E-17β concentration, which increased earlier and decreased later compared to treatments without ECP. In Experiment 2, cows received (i) ECP: n = 126; (ii) EB: n = 126; (iii) GnRH: n = 136; (iv) ECP+GnRH: n = 139; FTAI was performed 48-50 hr after PID removal. Pregnancy rates did not differ among ovulation inducers (p > .05; ECP: 54.0%, 68/126; EB: 49.2%, 62/126; GnRH: 40.4%, 55/136; ECP+GnRH: 43.9%, 61/139). In conclusion, ECP administration (ECP and ECP+GnRH treatments) affected E-17β concentrations, determining its earlier increase and later decrease compared to treatments without ECP (EB and GnRH treatments). ECP+GnRH-treated cows achieved the best distribution of ovulations without affecting pregnancy rates.

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Section: Discussionsupporting

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Effect of estradiol cypionate and GnRH treatment on plasma estradiol‐17β concentrations, synchronization of ovulation and on pregnancy rates in suckled beef cows treated with FTAI‐based protocols

Uslenghi

Vater²,

Aguilar³

et al. 2016

Reprod Domestic Animals

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“…No differences in pregnancy rate (P>0.05) were found between the EC and EB groups, which agrees with the results of Meneghetti et al (2009) for Nellore cattle (50.8% and 51.9% pregnancy rate, respectively) and Uslenghi et al (2016) for Bos taurus beef cows (54% and 49.2% pregnancy rate, respectively). However, Uslenghi et al (2014) reports the effects of hormonal treatment on pregnancy rate, founding a higher rate after EB (61.5%) compared to EC treatment (48.9%). The results found in the present study indicate that the type of estrogen used does not influence the gestation rate; however, the advantage of EC is to reduce the management of heifers in programs using FTAI.…”

Section: Discussionmentioning

confidence: 98%

Effects of reproductive tract development and hormonal treatment on estrous synchronization in heifers

et al. 2020

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Evaluation of the reproductive tract development (RTD) is a criterion rarely used when heifers are included in estrous synchronization programs. The objective of the present study was to determine the effect of RTD (mature and immature) and hormonal treatment (EC and EB) on estrous expression rate and pregnancy rate in Bos indicus heifers under tropical conditions. RTD was evaluated with an ultrasound and classified as mature (n=99) or immature (n=101). Heifers received an intravaginal device (DIB®; day 0), 2 mg of estradiol benzoate (EB) and 250 µg of cloprostenol (PGF2α). The DIB was removed on day 7 post insertion, and 250 µg of PGF2α was applied and heifers were divided into two groups: One group of heifers received 0.5 mg of estradiol cypionate (EC group), and on day 8, a second group of heifers received 1 mg of estradiol benzoate (EB group). Estrus was detected by visual observation, and all heifers were inseminated at a fixed-time (FTAI). Fifteen days after insemination, bulls were introduced to the treatment groups. Data were analyzed using general modeling and binary logistic regression procedures. The percentage of estrus was similar for both mature and immature heifers (P>0.05), however, the heifers treated with EB had 17% animals in estrus, than the heifers that received EC (P <0.05). The pregnancy rate after FTAI (74.8%) and total pregnancy (FTAI + natural mating = 91.9%) was greater for the group of heifers with a mature reproductive tract (P<0.05). The hormone treatment had not effect (P>0.05) on the pregnancy rate. In conclusion, the heifers with mature reproductive tracts had the highest pregnancy rate after artificial insemination and total pregnancy. Hormonal treatment did not influence the pregnancy rate.

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“…Ovulation takes place 26.7±5.4 h after the start of heat in dairy breeds (Walker et al 1996). The interval between stopping progesterone-based treatment and ovulation varies between 69.6±2.4 h to 73.1±1 h in the Zebu Nelore (Sà Filho et al 2010a) and from 65.4±2.2 to 66.0±3.3 h in other dairy breeds (Uslenghi et al 2014). Few data are available in the literature on this interval in N'Dama cattle.…”

Section: Introductionmentioning

confidence: 99%

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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Effect of estradiol cypionate and amount of progesterone in the intravaginal device on synchronization of estrus, ovulation and on pregnancy rate in beef cows treated with FTAI based protocols

Cited by 13 publications

References 31 publications

Effect of estradiol cypionate and GnRH treatment on plasma estradiol‐17β concentrations, synchronization of ovulation and on pregnancy rates in suckled beef cows treated with FTAI‐based protocols

Effect of estradiol cypionate and GnRH treatment on plasma estradiol‐17β concentrations, synchronization of ovulation and on pregnancy rates in suckled beef cows treated with FTAI‐based protocols

Effects of reproductive tract development and hormonal treatment on estrous synchronization in heifers

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

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