Resumen

YOSTAR, E.J. et al. Ultrasonografía en dos protocolos de superovulación en donantes Braford del nordeste argentino. Rev. vet. [online]. 2018, vol.29, n.1, pp.26-30. ISSN 1669-6840.  http://dx.doi.org/10.30972/vet.2912786.

Reproducing genetic merit animals led the development of different biothecnologies such as "embryo transfer". Superovulation treatments produce variable responses especially in synthetic cow breeds. The aim of the present work was to evaluate superovulatory response in Braford donors from the Argentinean northeast region trough monitoring ovaries by ultrasound. The study used 60 donors randomly assigned for two protocol treatments (T1: n=30 and T2: n=30), being examined only 6 animals per treatment on day 0 to determine cyclicity, then before injecting FSH (T1=day 3 and T2=day 4), for estrus control and to determine superovulatory response (T1=day 7 and T2= day 8), and finally at embryo collection (T1=day 14 and T2=day 15). Qualitative variables (with binomial distribution), were analyzed using contingency tables to calculate absolute and relative frequencies and chi2 test (p<0.05). The number of transferable embryos achieved was 6.85±0.75, degenerate embryos were 1±0.12, and unfertilized oocytes were 5.32±1.01. Ultrasonography in embryo collection did not show differences in total corpora lutea (12.6 vs 12.06), however, they were higher in right ovary (7 and 6.66) than in the left (5.6 and 5.4) in T1 and T2, respectively. The independence test did not established statistic significant evidence. We conclude that the great advances on superstimulation do not generate significant improvements on treatment responses, but it can be used as an alternative in embryo production, without affecting quantity and quality of ovarian structures at ultrasonography; even shortening the traditional treatments

Palabras clave : bovine; follicular wave; superovulation; ultrasonography.

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