This issue of Shanghai science and education film studio Special focuses on the analysis of dairy cattle conception. In the 1990s, the Institute of Nuclear Agricultural Sciences of Zhejiang Agricultural University proposed a pregnancy test method for dairy cattle. Researchers will determine whether a dairy cattle is conceived by testing the amount of flavonoids and hormones in the dry milk samples, which were made by farmers on the 19th and 23rd days after artificial fertilization. If the dairy cattle has been pregnant, the farmers should carfully manage it during pregnancy until its production. If not, the farmers should prepare for the next artificial fertilization.