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Through a transrectal ultrasonography (Aloka SSD 500 microplus equipment, linear transducer of 7.5MHz) a total of 267 observations were performed in a group of 50 females mainly Bos indicus, raised under humid tropical conditions and pregnant from day 20 every other day until day 40 post-artificial insemination (AI). The objective was to measure the size of the amniotic vesicle and the longitudinal...