关注幼儿 关注健康——幼儿园健康教育实施新思考
Published in 科教文汇 • Jan 1, 2009
Authors:
吕爱玲
Abstract
Holstein or crossbred beef cows were anaesthetized on Days 15 to 17 after oestrus; the ovarian artery (OA), ovarian (utero-ovarian) vein (OV) and a peripheral artery (PA), were catheterized for chronic blood sampling. Beginning on the day after surgery, 6 sequential blood samples were collected ever...
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