Minerals Chloride, copper, iodine, iron, sodium, potassium, magnesium, phosphorous and calcium all have an increased requirement for the last trimester. Most hays are high in iron and potassium and the majority of horses are having their requirements met in excess so adding these nutrients to the...

As long as your stallion is in good weight and is receiving a balanced diet, supplementing additional vitamins and minerals above requirement has not been conclusively proven to have any positive effect on fertility.  However, there is a nutrient that stands out as having a...