Timed artificial insemination in beef cattle using Gn RH agonist, PGF2alpha and estradiol benzoate (EB)

Fernandes, P.; Teixeira, Andrey Borges; Crocci, Adalberto José; Barros, C. M.

doi:10.1016/s0093-691x(01)00499-x

Cited by 47 publications

(33 citation statements)

References 27 publications

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“…However, pregnancy rate in the present study was higher than in two previous studies using 8 µg buserelin, such as 14.9% in anoestrous and lactating Nelore cows (Fernandes et al, 2001), and 14% in dairy cows during the hot season (De la Sota et al, 1998), and was comparable to the value (22%) reported for dairy cows during the hot season (Burke et al, 1996). In lactating dairy cows receiving 200 µg GnRH per injection, pregnancy rate was 34% (Gábor et al, 2002).…”

Section: Discussionsupporting

confidence: 50%

Induction of ovulation with GnRH and PGF2a in lactating Bos taurus × Bos indicus cows

Ahuja

Montiel

2004

Acta Veterinaria Hungarica

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Induction of ovulation for timed artificial insemination (TAI) with the Ovsynch protocol was evaluated in 49 anoestrous and lactating Bos taurus × Bos indicus cows. Palpation per rectum and transrectal ultrasonography were used on Days -30, -20, -10 and 0 (start of treatment) to confirm anoestrus but with the presence of follicles ≥ 10 mm, and every other day during treatment to determine ovarian activity. Cows were randomly assigned to: (1) Ovsynch (n = 24; Day 0, 200 µg GnRH; Day 7, 150 µg PGF 2α ; Day 9, 200 µg GnRH + TAI 16 to 20 h later) and (2) control (n = 25; no treatment). Rates of ovulation for the first GnRH injection, detection of a corpus luteum (CL) at PGF 2α injection, pregnancy and induction of cyclicity were greater (P < 0.05) with Ovsynch. There was no effect of body condition score (P > 0.05). In conclusion, the Ovsynch protocol was not effective in obtaining acceptable pregnancy rate for TAI, but it was effective for induction of cyclicity in anoestrous and lactating Bos taurus × Bos indicus cows under tropical conditions.

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Section: Discussionsupporting

confidence: 50%

Induction of ovulation with GnRH and PGF2a in lactating Bos taurus × Bos indicus cows

Ahuja

Montiel

2004

Acta Veterinaria Hungarica

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“…The Ovsynch protocol itself has not been successfully used to synchronize beef cows in postpartum anoestrus, with pregnancy rates in anoestrous cows significantly lower (14.9%) than in cycling cows (46.3%; Fernandes et al, 2001). Anoestrous is a common condition in extensively managed suckled beef herds (Bó et al, 2007;Baruselli et al, 2004) and the use of Ovsynch in beef herds has resulted in pregnancy rates as low as 15%, compared with 53% in cows treated with a progestin device and oestradiol .…”

Section: Ovulation Synchronization Treatments For Ftai In Beef Cattlementioning

confidence: 99%

Synchronization of ovulation and fixed-time artificial insemination in beef cattle

Bó

Baruselli²

2014

Animal

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The main objective of the implementation of artificial insemination (AI) in cattle is to produce a sustained genetic progress in the herd. Although AI is an old reproductive biotechnology, its widespread implementation is very recent and is mainly because of the use of protocols that allows AI without oestrus detection, commonly called fixed-time artificial insemination (FTAI). The development of FTAI protocols also allowed the application of AI in larger, extensively managed herds and especially in suckled cows instead of restricting the breeding programmes to the heifers. Fixed-time AI treatments are widely used in South America, with about 3 000 000 cows inseminated in the last season in Argentina and about 8 000 000 in Brazil. The objective of this review is to present and describe the various treatments available and some of the factors that may affect pregnancy rates in beef cattle.

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“…However, in the absence of progesterone (removal of the device and luteolysis), estradiol results in ovulation of the dominant follicle in bovines (CASTILHO et al, 2000;FERNANDES et al, 2001). In sheep, estradiol was tested only to induce the follicular wave, which begins approximately 4-6 days after applying the hormone (BARRETT et al, 2008;BARTLEWSKI et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Use of estradiol benzoate to induce ovulation in a short-term protocol for fixed-time AI in sheep

et al. 2015

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The aim of this study was to test the hormonal protocol for fixed-time artificial insemination (TAI) with a progesterone vaginal device for six days applying equine chorionic gonadotropin (eCG) or estradiol benzoate (EB) as an ovulation inducer in ewes. On day 0 (D0), the ewes (n=31) received a device containing 0.33 g of intravaginal progesterone (CIDR ® ) and were divided into three groups. The G-CT (control group) used CIDR for nine days and upon withdrawal of the progesterone, were administered prostaglandin F2 alpha (PGF2α) and eCG. In the eCG (G-eCG) group, CIDR was administered for six days, instead of nine as in the G-CT group, followed by PGF2a and eCG after progesterone withdrawal. In the EB (G-EB) group, CIDR was also administered for six days, but eCG was not applied, and EB was used to induce ovulation 24 hours after removing the CIDR and PGF2a application. TAI was realized in all groups 50 hours after CIDR withdrawal. The pregnancy rate in the G-eCG group (66.66%) was higher (p <0.05) than that in the G-EB group (11.11%). The short-term groups showed no difference (p>0.05) compared to the G-CT group (30%). It is possible to reduce the application time of the progesterone and use eCG for TAI in sheep; however, using EB resulted in a low ovulation rate in the sheep. Key words: Ovine CIDR, laparoscopy, ovulation, serum progesterone ResumoO objetivo do presente estudo foi testar protocolo hormonal para inseminação em tempo fixo (IATF) usando dispositivo de progesterona vaginal por seis dias e aplicação de eCG (gonadotrofina coriônica equina) ou BE (benzoato de estradiol) como indutor de ovulação em ovelhas. No dia 0 (D0), as ovelhas (n=31) receberam CIDR e foram divididas em três grupos. O grupo controle (G-CT) usou CIDR por nove dias e na retirada do dispositivo foi administrado PGF2a e eCG. No grupo eCG (G-eCG), CIDR foi mantido por seis dias, ao invés de nove como no G-CT, com aplicação de PGF2a e eCG na retirada da progesterona. No grupo benzoato de estradiol (G-EB), o CIDR também foi administrado por seis dias, mas não foi utilizado eCG, o BE foi usado para induzir ovulação e foi aplicado 24 horas após a remoção do CIDR e administração de PGF2a. A IATF foi feita em todos os grupos 50h após a retirada do CIDR. A taxa de prenhez do G-eCG (66,66%) foi maior (p <0.05) que no G-EB (11,11%). O grupo G-eCG de curta duração não diferiu (p>0,05) do G-CT (30%). É possível reduzir o tempo de permanência da progesterona usando eCG para IATF em ovelhas, entretanto o uso de BE resultou em baixa taxa de ovulação. Palavras-chave: CIDR ovino, laparoscopia, ovulação, progesterona plasmática

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Timed artificial insemination in beef cattle using Gn RH agonist, PGF2alpha and estradiol benzoate (EB)

Cited by 47 publications

References 27 publications

Induction of ovulation with GnRH and PGF2a in lactating Bos taurus × Bos indicus cows

Induction of ovulation with GnRH and PGF2a in lactating Bos taurus × Bos indicus cows

Synchronization of ovulation and fixed-time artificial insemination in beef cattle

Use of estradiol benzoate to induce ovulation in a short-term protocol for fixed-time AI in sheep

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