Proporção sexual de embriões bovinos PIV 60 D após TETF de acordo com o estágio de desenvolvimento embrionário inovulado

Ortlibas, Bruna Alves; Muniz, Gustavo Bortolucci; Netto, Halim Atique; Prado, R. B.; Atique, Tábata Salum Calille; Monteiro, Fábio Morato; Oliveira, Letícia Zoccolaro

doi:10.17523/bia.v72n4p349

Cited by 1 publication

(1 citation statement)

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“…Such as the postpartum period, the stage of embryonic development did not influence pregnancy rates. This result was also observed in other studies that demonstrated similar pregnancy rates between the stages of IVP blastocysts (Dantas et al, 2018;Hasler et al, 2002;Ortlibas et al, 2015;Veloso Neto et al, 2014). In addition, embryos transferred in more advanced stages (blastocysts) usually show an increase in the number of pregnancies when compared to the transfer of morulae (Dantas et al, 2018;Leese, 2012) possibly because they present biochemical differences and better use of uterine substrates (Leese, 2012).…”

Section: Discussionsupporting

confidence: 87%

Effect of the Postpartum Days on the Pregnancy Rate of Cows Submitted to Fixed-Time Embryo Transfer

Maistro

Gaitkoski²,

Hidalgo

et al. 2020

BJD

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The present study aimed to analyze the influence of the postpartum period on the pregnancy rate of cows submitted to fixed-time embryo transfer (FTET). It was used one hundred thirty-one crossbreed embryo recipient cows, on the 79.35 th ± 28.0 days postpartum and BCS between 2.75 to 3.0. The cows received a hormonal protocol initiated on a random day of estrus cycle (D0), beginning with an intravaginal device containing 1.9 g of progesterone and intramuscular administration (IM) of 2 mg of estradiol benzoate. In D8, the intravaginal device was removed, and it was administered a 0.15 mg D-cloprostenol, 0.5 mg estradiol cypionate and 300 IU eCG IM. TheFTET of Senepol IVP embryos was performed on D17, without previous estrus observation. The recipient cows were divided into two experimental groups: until the seventh day postpartum (N = 70) and after the seventh day postpartum (N = 61). The pregnancy diagnosis was performed by transrectal ultrasonography (Mindray DP2200, 7.5 Mhz) on the 23 th day after ET. The pregnancy rate of the recipient's cows was 52% (68/131) and there was no difference (p>0.05) on the pregnancy rate of the recipient's cows regarding the embryo development stage, neither the postpartum period. In conclusion, the use of calving cows as embryos recipients may be a viable alternative, resulted in adequate pregnancy rates, optimizing the use of this animal category in embryo transfer programs.

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