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The development of the yellow body and ovarial vesicles was evaluated in 20 cows during an entire oestrus cycle (group II, n = 9) and an oestrus ended by pregnancy (group I, n = 11) using a linear ultrasonograph (5 MHz). The investigations were performed on the first day of oestrus and then on the 5, 12 and 18 day after oestrus. The maximum diameter of the yellow body was noted on the 12th day of...
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