In Europe, during the sixteenth and the seventeenth centuries, questions that occupied the minds of the scientists and philosophers in characterizing the universe as a whole were those which related to a concept of infinity in time and space. New theories on gravity, motion, ext…
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Studies of follicular development in cattle may lead to methods for more precise estrous synchronization. Nineteen lactating cows and 20 heifers were used to determine if progesterone results in a persistent dominant follicle. Cows and heifers were assigned (at estrus = d 0) to …