HTMA has been responsible for live on ground, safe delivery of many foals. Mares that have hormonal imbalances rarely produce live healthy foals or fail to conceive at all. It is common for such mares to have a dominance of testosterone in relation to estrogen & progesterone. These mares display "mareish" or stallion type traits, have irregular cycling or slipped foals. Adequate levels of selenium combined with a correct ratio of zinc to copper balances hormone levels. What is often overlooked before breeding is ensuring your mare's bone density is adequate. The Ca/P  ratio indicates the levels of calcium in relation to phosphorous. Calcium needs rise during pregnancy and lactation. If the Ca/P ratio is compromised, foals can be born with all manner of bone deformities and irregulartities. It is sensible and beneficial to your mare and breeding program to know the state of health of your mare before embarking on a breeding program.