Cipionato de estradiol e benzoato de estradiol em protocolos de inseminação artificial em tempo fixo em novilhas mestiças

Sobreira, Roberto Ramos; Almeida, Ítalo Câmara de; Oliveira, Fabrício Marques de; Siqueira, Jeanne Broch; Barioni, Graziela; Lima, Diogo Vivacqua de; Siqueira, Larissa Ataide

doi:10.35172/rvz.2017.v24.295

Cited by 4 publications

(2 citation statements)

References 15 publications

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“…diameter for animals receiving ECP at D8 (10.71 ± 2.43 mm) and EB at D9 (11.45 ± 2.34 mm). More recently, crossbred cows showed 9.77 ± 1.36 mm and 10.97 ± 1.24 mm (Ramos Sobreira et al, 2017) for EB and ECP, respectively, with no statistical difference. Although the results obtained in the present study demonstrate a numerically superior means to the other studies mentioned, the similarity between the follicular diameters obtained with the use of both ovulation inducers suggests that the two were effective to stimulate the growth and also to obtain follicles greater than 10 mm which, according to Sartori et al (2001), is a size that already has the capacity to respond to the action of LH and, consequently, to ovulate.…”

Section: Discussionmentioning

confidence: 95%

Comparison of estradiol benzoate and cypionate in Girolando cows submitted to a timed artificial insemination

Silva¹,

Mello²,

Silenciato³

et al. 2019

Braz. J. Vet. Res. Anim. Sci.

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The various studies on the manipulation of the estrous cycle culminated in the development of estrous and ovulation synchronization protocols, to the point of defining an optimum moment for artificial insemination. The induction of ovulation is a primordial part for the determination of the moment of the TAI, so to study which hormones and how they behave allows a better understanding of this physiological process and, to manipulate it efficiently. The aim of the present study was to compare the use of estradiol benzoate (EB) and cypionate (ECP) as ovulation inducer in Girolando cows submitted to Timed Artificial Insemination (TAI). Ovulations of 108 Girolando cows were synchronized and the initial day of treatment, recorded as D0, which was when the animals received an intravaginal device containing 1g of progestogen and an intramuscular application (im) of 2mg of EB. After 8 days (D8), the device was removed and 500μg of cloprostenol (im) was administered to all females. Then, the animals were randomly divided into two treatments: BG Group (n = 52) and CG Group (n = 56). The CG animals received 1mg of ECP (im) as the ovulation inducer at the time of device removal, while BG Group cows received 1mg of EB (im) 24 h later (D9). TAI occurred at D10. After device removal, ultrasound evaluations were performed every 12 h up to ovulation. The following reproductive parameters were evaluated: interval from intravaginal device removal to ovulation - IDO (hours); interval from ovulation to TAI-IOT (hours); diameter of the largest follicle at intravaginal device removal (mm); maximum diameter of the DF (mm) at D10; the dominant follicle growth rate (mm/day); synchronization rate - SR (%); ovulation rate - OR (%) and PR - pregnancy rate (%). Only the ovulation rate presented a statistical difference (p<0.05). In conclusion, despite the ovulation rate difference, both estradiol esters administered were effective and presented similar pregnancy rates in Girolando cows submitted to TAI.

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Section: Discussionmentioning

confidence: 95%

Comparison of estradiol benzoate and cypionate in Girolando cows submitted to a timed artificial insemination

Silva¹,

Mello²,

Silenciato³

et al. 2019

Braz. J. Vet. Res. Anim. Sci.

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“…Existe una gran diversidad en los tipos de protocolos hormonales para la reproducción de vacas. En este contexto, el éxito de la implementación de esta biotecnología reproductiva, caracterizada por tasas de preñez satisfactorias, también varía, con tasas de preñez que van del 16 al 68% en vacas lecheras (13,16,17,18).…”

Section: Discussionunclassified

Effect of follicular growth promoters on timed artificial insemination in dairy cows.

et al. 2020

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Objective. To evaluate the efficiency of equine chorionic gonadotropin (eCG) and follicle stimulating hormone (FSH) on the pregnancy rate of crossbred cows from different body condition score (BCS) in the postpartum period in timed artificial insemination (TAI). Material and methods. The cows were subjected to the same hormone protocol: Day zero (D0), progesterone-release intravaginal device (PRID) and 2 mg estradiol benzoate (EB); D8, withdrawal of PRID, application 0.150 mg of prostaglandin. On D8, the animals were distributed into three treatments: 1 – (TeCG; n = 98) injection of 300 IU eCG; 2 – (TFSH; n = 84) injection of 20 mg of FSH and; 3 – (Control; n = 115) without further treatment. On D9, all animals received 1 mg of EB; D10, TAI of all the cows. After 30 days from TAI, ultrasound diagnosis of pregnancy was performed. Results. Pregnancy rate did not differ among eCG (52.04%), FSH (40.47%), and Control (40.00%) treated cows (p>0.05). In cows with low body condition, the pregnancy rate was higher (p<0.05) for cows treated with eCG (41.46%) when compared to FSH (18.18%) and Control (17.07%) cows. The postpartum interval among treatments was similar (p>0.05) (35–65 or 66–95days). Conclusions. The use of eCG or FSH did not result in an increase in the pregnancy rate when compared to the control treatment; however, eCG improved the pregnancy rate of cows with low body condition scores.

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Recombinant bovine somatotropin in the synchronization of ovulation in crossbred dairy cows (Bos taurus indicus × Bos taurus taurus)

Oliveira

Almeida

Sena³

et al. 2020

Vet World

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Aim: The aim of this study was to evaluate the effects of the administration of recombinant bovine somatotropin (rbST) at the moment of implementation of the timed artificial insemination protocol, on follicular dynamics and pregnancy rate in crossbred cows. Materials and Methods: A total of 346 cows were used in two experiments with a factorial 2×2 design. The cycling cows (Tcycling) and the anestrous cows (Tanestrous) were considered as factor 1 and the administration of rbST (TrbST) or not (Tcontrol) as factor 2. The experimental protocol: (1) Tcontrol – day 0 (D0), insertion of a progesterone-release intravaginal device (PRID) plus 2 mg of estradiol benzoate (EB); D8, PRID removal, plus 0.150 mg of prostaglandin F2α, and 400 IU of equine chorionic gonadotropin; D9, 1 mg of EB; and with artificial insemination at day 10; (2) TrbST – similar to Tcontrol plus 500 mg of rbST on D0. In experiment I, ultrasound examinations were performed in all treatments. In experiment II, the cows' pregnancy rate was evaluated. Data were analyzed with 5% probability. Results: There was no effect of the protocols on cows cyclicity or follicular growth rate (p>0.05). There was no interaction of the effects, administration of rbST, and the cyclicity of cows on the pregnancy rate. The total pregnancy rate observed was 49.0%. The pregnancy rate in cows receiving rbST was lower for anestrous compared with cycling cows (p<0.05). Conclusion: The administration of rbST did not alter the patterns of follicular dynamics nor the ovulation rate. However, cows in anestrous that received rbST had lower pregnancy rates than cycling cows.

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Cipionato de estradiol e benzoato de estradiol em protocolos de inseminação artificial em tempo fixo em novilhas mestiças

Cited by 4 publications

References 15 publications

Comparison of estradiol benzoate and cypionate in Girolando cows submitted to a timed artificial insemination

Comparison of estradiol benzoate and cypionate in Girolando cows submitted to a timed artificial insemination

Effect of follicular growth promoters on timed artificial insemination in dairy cows.

Recombinant bovine somatotropin in the synchronization of ovulation in crossbred dairy cows (Bos taurus indicus × Bos taurus taurus)

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