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.
If you are needing to stretch hay or have a hard keeper or a horse with poor dentition you can feed up to 50% of the dietary forage as beep pulp (dry weight). So for a 1,200-pound horse being fed 2% of body weight as forage, you would feed 12 pounds of beet pulp per day. Also, if you have an easy keeper, remember that beet pulp provides more calories per pound than an equal amount of grass hay.