Final answer:
The given statement is true, the combination of Timothy hay and good oats makes for a true and satisfactory ration for adult horses, providing a balanced diet in essential nutrients like protein, calcium, and vitamins, especially for broodmares and growing horses.
Step-by-step explanation:
The statement that Timothy hay and good oats fed together make a satisfactory ration for adult horses is true. Timothy hay is a high-quality forage that provides a source of essential nutrients such as fiber, protein, and calcium, which are crucial for the overall health of horses, including broodmares and young, growing horses. Good oats are often considered an excellent source of energy and are rich in vitamins and minerals that complement the nutritional profile of Timothy hay, leading to a balanced diet. Feeding horses a combination of these two can offer a diet that is not only high in protein but also provides adequate levels of energy and essential micronutrients during the winter months when grazing is not possible.