Add more ports by: Upgrading your Mac's graphics card. Apple has phased out this proprietary display plug, but you might see it on an older monitor or Mac. Look for the rounded shape of the rectangular connector to help in identification. The cable carries power, USB, and video. You can adapt a DVI signal for an ADC monitor, but the converter boxes can be pricey; an ADC signal from a Mac is more easily converted to DVI for a standard display.
Most nutrition articles about feeding horses recommend approximately two (2) percent of their body weight in forage per day. This would mean a 1,000-pound horse would need about 20 pounds a day. This amount is not carved in stone.
Grain: A regularly worked horse might receive five to ten pounds of grain per day. More feed should obviously be given to a horse who has worked harder or to a larger horse, and less feed to a smaller horse or one who has worked less. This varies with each horse and also varies depending on the quality of the grain. Hay: Generally speaking, give 1 pound of hay per 100 pounds of body weight. So, a 1,000 pound horse would have a minimum of 10 pounds of hay.