Characteristics of the case/control design.
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The 7962 artificial insemination (AI) bulls were subdivided based on their male reproductive ability (MRA). Forty-nine bulls with MRA≤−20 were considered as subfertile. The mean and standard deviation for MRA and the 56-day non-return rate (NRR56) is presented for both groups.
创建时间：
2014-01-02
