Strategy to improve the parturition ability in crossbred recipients implanted with embryos produced in vitro

Aguiar, Thiago Sanches; Moreira, Pâmela Rodrigues Reina; Moreti, B. S.; Berber, G. C. M.; Pinto-Neto, Adalgiza; Berber, R. C. A.

doi:10.36560/1212019682

Cited by 1 publication

(2 citation statements)

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“…The weight of the calves in Group 1 was lower than in the Control (Table 1), corroborating the findings of Echternkamp et al (2007a); however, the average calf weights at birth in the present experiment may explain the lower rate of assistance during birth and similarity in the gestational period, as the weights rarely exceeded 40 kg. It is noteworthy that the reduction in the individual size of each fetus is a consequence of competition for space and availability of nutrients (Aguiar et al, 2019).…”

Section: Resultsmentioning

confidence: 99%

“…The search for improvement in reproductive efficiency is an effective tool for the economic maintenance of economic development in beef cattle. Diversification in the use of fixed-time insemination (TAI) and fixed-time transfer (FTET) protocols has been common since the early 2000s, as it increases the number of animals inseminated and facilitates large-scale embryo innovation (Bo et al 2004;Aguiar et al, 2019;Pinto Neto et al, 2018;.…”

Section: Introductionmentioning

confidence: 99%

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Gestational losses after innovating with two embryos in a fixed-time embryo transfer program

Barbosa

Silva

Col³

et al. 2021

Sci. Elec. Arch.

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The aim of this study was to quantify the pregnancy rate after implantation of two embryos after FTET protocols, as well as to monitor pregnancy losses until parturition, evaluating, mainly, if this strategy results in more number of animals born. Therefore, 423 multiparous recipients were selected, standardized in terms of body score, who had high-quality corpora lutea. Animals were randomly divided into two groups according to one or two embryos transferred (1 embryo = Control, n = 237; 2 embryos = Group 1, n = 186). All recipients received the same hormonal treatment, which consisted of administering, on Day 0, 2 mL of estradiol benzoate (Gonadiol, ZOETIS) + 1.9 g multidose 1st use progesterone implant (CIDR, ZOETIS); on Day 8 the implants were removed + injected 0.4 mL of estradiol cypionate (E.C.P, ZOETIS) + 1.5 mL of eCG (Novormon, ZOETIS) + 1 mL of dinoprost tromethamine (Lutalyse, ZOETIS). The animals were evaluated by ultrasonography at 30 and 60 days after embryo transfer, to diagnose the success rate and embryo losses during this period. Furthermore, information was collected on births, length of gestation, number of twin births, number of childbirth assistance and the weight of the calves. The results showed that Group 1 had better success than the Control, with higher conception rates at 30 days (68.3% vs. 53.2%, P<0.001) and at 60 days (62.9% vs. 52.3%; P<0 .05). The number of animals born was also higher for Group 1 (53.3% vs. 43.3%, P<0.01). The percentage of twins born in Group 1 was 17.9%, and the animals had lower weight compared to the Control (34.29 + 7.36 vs 37.63 + 5.73, P<0.05). The length of pregnancy and the number of assistances were similar between groups. In conclusion, the strategy adopted in this experiment suggests a considerable increase in the calf birth rate, but losses during pregnancy and their mechanisms need to be elucidated.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%