Pugliesi Guilherme, de Melo Gabriela Dalmaso, Ataíde Gilmar Arantes, Pellegrino Carlos Augusto Gontijo, Silva Júlio Barboza, Rocha Cecília Constantino, Motta Igor Garcia, Vasconcelos José Luiz Moraes, Binelli Mario
Departamento de Reprodução Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Pirassununga, SP, Brazil.
Prole, Belo Horizonte, MG, Brazil.
Anim Reprod. 2018 Aug 17;15(3):239-246. doi: 10.21451/1984-3143-AR2018-0059.
The intensive use of Doppler ultrasonography in several studies in the last decade allowed the characterization of vascular perfusion and the estimation of function of the reproductive organs and tissues along the estrous cycle and pregnancy in cattle. We aim to discuss the possibility of using Doppler imaging and to explore the potential of its inclusion in reproductive programs in cattle industry. Recent studies in dairy and beef cows indicated a high accuracy and sensitivity when Doppler ultrasonography is used to evaluate corpus luteum function and to diagnosis pregnancy between days 20 and 22. Moreover, resynchronization programs starting 5 to 7 days after timed embryo transfer (FTET) coupled with early pregnancy diagnosis were developed for beef cattle, and have been implemented in commercial embryo transfer programs. These strategies allow a reduction in the interval between two FTET from ≈ 40 to 24 days and may improve the gains in reproductive efficiency when compared to traditional programs than begin resynchronization after the pregnancy diagnosis at 30 days. A second alternative to use Doppler imaging is the evaluation of luteal blood perfusion at the time of embryo transfer for selection of recipients with greater receptivity potential. This may increases fertility in FTET, as embryos would not be transferred to females with non-functional CL, and in cases with recipients surplus, females with higher receptivity would be prioritized.
在过去十年的多项研究中，对多普勒超声的大量使用使得能够对牛发情周期和妊娠期生殖器官及组织的血管灌注进行特征描述并评估其功能。我们旨在探讨使用多普勒成像的可能性，并探索将其纳入养牛业繁殖计划的潜力。近期对奶牛和肉牛的研究表明，当使用多普勒超声评估黄体功能以及诊断第20至22天的妊娠情况时，具有较高的准确性和敏感性。此外，针对肉牛制定了在定时胚胎移植（FTET）后5至7天开始并结合早期妊娠诊断的再同步程序，并已在商业胚胎移植计划中实施。与在妊娠30天诊断后开始再同步的传统程序相比，这些策略可将两次FTET之间的间隔从约40天缩短至24天，并可能提高繁殖效率。使用多普勒成像的另一种选择是在胚胎移植时评估黄体血流灌注，以选择具有更大接受潜力的受体。这可能会提高FTET的受孕率，因为胚胎不会移植到黄体功能不全的雌性体内，并且在受体过剩的情况下，具有更高接受能力的雌性将被优先考虑。
