September 2003

Protein Is More Than A Percentage

You must calculate it in grams, then use a protein supplement to ensure an adequate essential amino-acid intake, too.

Hay is a good source of crude protein, but not amino acids.

A horse’s protein needs can’t be defined solely by a percentage. A 1,100-pound horse at maintenance needs 660 grams of crude protein a day, which he can meet with just 22 pounds of a 6.6% protein grass hay. For grain, 11 pounds of a 13% protein grain will also meet the needs, although few horses need this much grain.

A typical diet for a horse in light work is about five pounds of grain and 25 pounds of hay per day. Five pounds of a 10% protein grain provides 227 grams of protein, while a typical 7% protein grass hay gives him 796 grams. This is 1,022 grams, 55% more…