Mitos e realidades sobre a inseminação artificial em tempo fixo (IATF) em bovinos de corte

Baruselli, Pietro Sampaio; Abreu, Laís Ângelo de; Catussi, Bruna Lima Chechin; Santos, Guilherme Felipe Ferreira dos; Factor, Luana; Felisbino, Augusto Rodrigues; Frigoni, Fábio Girardi; Crepaldi, Gabriel Armond

doi:10.21451/1809-3000.rbra2021.083

Cited by 13 publications

(20 citation statements)

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“…In buffaloes, hormonal treatments have been designed to control both luteal and follicular functions, providing exciting possibilities for the synchronization of follicular growth and ovulation that enabled the use of timed artificial insemination (TAI) during the breeding and nonbreeding season (Baruselli, Madureira, Barnabe, et al, 1999; De Rensis et al, 2005). Satisfactory pregnancy rates of approximately 40–60% have been achieved with the Ovsynch protocol in cycling buffalo synchronized during the breeding season (Ali & Fahmy, 2007; Baruselli, Madureira, Visintin, et al, 1999; Berber et al, 2002; Neglia et al, 2003). However, anestrous buffaloes respond poorly to the Ovsynch protocol and have lower pregnancy rates after TAI during the nonbreeding season (Ali & Fahmy, 2007; Baruselli et al, 2007; De Rensis et al, 2005).…”

Section: Estrus and Ovulation Synchronization For Fixed‐time Artifici...mentioning

confidence: 99%

“…Numerous strategies were developed to evaluate the efficiency of the Ovsynch protocol in buffaloes (Atabay et al, 2019; Baruselli, Madureira, Barnabe, et al, 1999; Baruselli, Madureira, Visintin, et al, 1999; Berber et al, 2002; Chaikhun, Promdireg, & Suthikrai, 2010). These works provided evidence that buffaloes respond to hormonal treatment and that a new follicular wave emergence occurs due to the ovulation of the dominant follicle present at the time of the first GnRH injection.…”

Section: Estrus and Ovulation Synchronization For Fixed‐time Artifici...mentioning

confidence: 99%

“…Several years after the successful outcome of Ovsynch in dairy cattle (Pursely et al, 1995), FTAI technology has been successfully applied in buffaloes (Baruselli et al, 2002; Baruselli, Madureira, Visintin, et al, 1999). To date, synchronization of estrus and ovulation in tandem with FTAI is widely practiced in buffaloes (Alyas et al, 2013; Atabay et al, 2019; Campanile et al, 2005; Kalwar et al, 2015; Ravikumar & Asokan, 2008).…”

Section: Estrus and Ovulation Synchronization For Fixed‐time Artifici...mentioning

confidence: 99%

“…The formation of an accessory CL and supplementation of P 4 after insemination increased the plasma P 4 concentration, which is very important in the preparation of the uterine environment for subsequent development of the embryos to term. When Ovsynch protocol is used during spring and summer when a high incidence of anestrous was observed, 5–35% pregnancy rates were obtained (Atabay et al, 2019; Baruselli et al, 2002; Baruselli, Madureira, Visintin, et al, 1999; Chaikhun, Tharasanit, & Rattanatep, 2010).…”

Section: Estrus and Ovulation Synchronization For Fixed‐time Artifici...mentioning

confidence: 99%

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Current status of assisted reproductive technologies in buffaloes

Srirattana

Hufana-Durán

Atabay

et al. 2022

Animal Science Journal

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Buffaloes are raised by small farm holders primarily as source of draft power owing to its resistance to hot climate, disease, and stress conditions. Over the years, transformation of these animals from draft to dairy was deliberately carried out through genetic improvement program leading to the development of buffalo-based enterprises. Buffalo production is now getting more attention and interest from buffalo raisers due to its socioeconomic impact as well as its contribution to propelling the livestock industry in many developing countries. Reproduction of buffaloes, however, is confronted with huge challenge and concern as being generally less efficient to reproduce compared with cattle due to both intrinsic and extrinsic factors such as poor estrus manifestation, silent heat, marked seasonal infertility, postpartum anestrus, long calving interval, delayed puberty, inherently low number of primordial follicles in their ovaries, high incidence of atresia, and apoptosis. Assisted reproductive technologies (ARTs) are major interventions for the efficient utilization of follicle reserve in buffaloes. The present review focuses on estrus and ovulation synchronization for fixed time artificial insemination, in vitro embryo production, intracytoplasmic sperm injection, cryopreservation of oocytes and embryos, somatic cell nuclear transfer, the factors affecting utilization in various ARTs, and future perspectives in buffaloes.

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Section: Estrus and Ovulation Synchronization For Fixed‐time Artifici...mentioning

confidence: 99%

Section: Estrus and Ovulation Synchronization For Fixed‐time Artifici...mentioning

confidence: 99%

Section: Estrus and Ovulation Synchronization For Fixed‐time Artifici...mentioning

confidence: 99%

Section: Estrus and Ovulation Synchronization For Fixed‐time Artifici...mentioning

confidence: 99%

See 2 more Smart Citations

Current status of assisted reproductive technologies in buffaloes

Srirattana

Hufana-Durán

Atabay

et al. 2022

Animal Science Journal

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“…Although artificial insemination was introduced to the cattle industry in the 1930s, the NS remains one of the most important management strategies because it is the predominant breeding method in beef herds (Diskin & Kenny, 2016; Foote, 2001; Parkinson, 2004). For example, around 84% of the beef female cattle population available for reproduction in Brazil are subjected to NS breeding (Baruselli et al, 2019). This number is not so different from the ones reported in other countries such as the US (~90%) and Australia (~98%) (Evans, 1991; McGowan et al, 2015; Hall, 2019; USDA, 2020).…”

Section: Introductionmentioning

confidence: 99%

Calving date as a potential predictor for the probability of approval in the first breeding soundness evaluation of Nellore bulls

Diaz-Miranda

Penitente-Filho

Gomez-León

et al. 2023

Reprod Domestic Animals

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Beef production systems primarily use natural service (NS) for breeding. However, a significant number of bulls used for NS are subfertile, limiting the profitability of the cow‐calf operations. Therefore, producers should select bulls based on breeding soundness evolutions (BSE) to ensure higher pregnancy rates. Several factors can affect the bull ability to pass a BSE. We hypothesize that calving date would be a factor that affects the bull probability of approval at the first BSE. For this purpose, a multivariate logistic regression in a dataset of 14,737 BSEs from young Nellore bulls was used. Correlations between calving date, biometrics, and semen traits were evaluated using Pearson's correlation coefficient. Our results demonstrated that the calving date affected the probability of approval at the first BSE (p < .05). Indeed, the variable that added more information to our model was the calving date, far more than the age group of the bulls according to Akaike's information criterion. Hence, bulls born on day 0 of the calving season have 1.26 more chances to be approved at the first BSE than bulls born 21 days later. This result highlights the importance of getting the dams of future bulls pregnant as soon as possible in the breeding season. In addition, the calving season should be no longer than 47 days to achieve 80% BSE approval in 20–22 months old Nellore bulls. The strongest correlation was with SC, which decreased as the calving date increased. Therefore, the calving date may be used as a predictor of the outcome of the first BSE in young bulls. In that way, the calving date can help seedstock producers to maximize efficiency in making crucial management decisions during the breeding and calving season including nutrition, reproductive, and culling.

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Effect of recombinant bovine somatotropin on the reproductive efficiency of beef cows subjected to differently timed‐artificial insemination protocols

Gasseferth,

Gaievski,

Bergstein‐Galan

et al. 2023

Reprod Domestic Animals

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This study aimed to verify the reproductive efficiency of beef cows treated with recombinant bovine somatotropin (rbST). Study 1, Bos indicus cows were distributed (three groups). The control group (CG) was subjected: on day zero (d0), the animals received a CIDR and oestradiol benzoate (EB); on (d8, CIDR was removed, and PGF2α and oestradiol cypionate (EC) were administered; on d10, timed Artificial Insemination (TAI) was performed; on d45, pregnancy diagnosis was made. The rbST on d0 group (bST0G) was subjected to an identical protocol as CG, except for the addition of 250 mg rbST on d0. The rbST on d8 group (bST8G) was subjected to the same protocol as bST0G, except that the rbST was administered on d8 rather. In study 2, the animals followed the same design which was used in Bos taurus cows. The follicular growth rate (FGR) was calculated between d8 and d10. In study 1, pregnancy/artificial insemination (P/AI) did not differ among the treatments. FGR in bST8G was higher than in other groups. In study 2, bST0G showed higher Pregnancy/Artificial Insemination (P/AI) (p < .05) when compared with other groups. bST0G showed a different FGR (p < .0001) than the other groups. In conclusion, rbST (Bos indicus cows) did not increase P/AI, but it did promote follicular growth when administered on d8; the rbST administered on d0 improved P/AI (p < .05) and the FGR in Bos taurus cows.

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Mitos e realidades sobre a inseminação artificial em tempo fixo (IATF) em bovinos de corte

Cited by 13 publications

References 0 publications

Current status of assisted reproductive technologies in buffaloes

Current status of assisted reproductive technologies in buffaloes

Calving date as a potential predictor for the probability of approval in the first breeding soundness evaluation of Nellore bulls

Effect of recombinant bovine somatotropin on the reproductive efficiency of beef cows subjected to differently timed‐artificial insemination protocols

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