A researcher at the University of Milan, Italy, supplemented vitamin E with quantities that exceed nrc recommendations, reduced mastitis, and improved cow reproductive performance. Feeding vitamin E at 2000iu per day for Holstein cows significantly reduced somatic cell counts compared to cows consuming only 1,000 iu, and supplementation took place from 7 days before calving to 14 days after calving. In addition, the cows supplemented with high-dose vitamin E had an average of 83.8 days of conception, and the number of inseminations per pregnancy was only 1.32, while the cows supplemented with 1000iu of vitamin E had an average of 111.3 days of infertile days and needed 2.17 inseminations. Studies suggest that feeding high levels of vitamin E can increase resistance to mastitis and other diseases per cow. Since the closer to the birth, the intake of cows is reduced, and the amount of vitamin e obtained from the feed is clearly insufficient. In addition, the stored feeds fed in late pregnancy, such as corn silage, have less vitamin E. For this reason, vitamin E supplements must be added to the dry cow's premix.
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