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【单选题】
如某牛场 上年末适2655头,全年参配2142头次,参配牛最终妊娠数为2016头, 一个情期配种受胎1689头, 配种总情期数4176,产犊数1998头,则本年度该牛场第一 情期受胎率 和 繁殖率分别为: ( )A.
80.7%、75.3%
B.
80.7% 、 75.9%
C.
40.4%、75.9%
D.
78.9%、75.3%
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2000个家庭的人均收入
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