Selenium injections have been shown to reduce the incidence of retained placenta. Selenium supplements also are available and added selenium may be beneficial when the incidence of retained placenta is higher than normal. When injecting, give 50 mg selenium at 21-28 days before calving. Do not ignore other causative factors. Excessive amounts of corn silage during the dry period can contribute to overfeeding of energy or improper calcium-phosphorus balances.
Legumes are high in protein and calcium content, which cause nutrient imbalances.
Limit corn silage or legume to a maximum of 12-14 lb dry matter per day or 1 lb dry matter per 100 lb body weight. Cows should not be overly fat at calving. Limit the feeding of grain or concentrate to 6-7 lb per day. Avoid excessive corn silage consumption during the dry period. Feed dry cows a lower quality grass hay.