Protein requirement (growing horses)

Both the absolute protein requirement and the need for high quality protein is higher for growing horses than for other horses. Young horses generally have a smaller feed intake than adult animals. As a consequence, the concentration of digestible crude protein must be higher in the diets of young growing horses than for any other category.

Protein requirement (DCP) to growing horses at different ages:

Age, months	3	6	12	18	24	30	36
DCP, g/d	650	530	425	380	350	350	350
DCP, g/MJ	13.3	9.5	7.1	6.3	6.0	6.0	6.0

An optimal ratio between energy and protein is required for a balanced growth. The demands for protein per unit of energy decrease (table) as the horse gets older.

The requirement for the amino acid lysine also declines with age. At ages of 3, 6, 12 and 18 months the requirement for lysine is 0.7, 0.5, 0.4 and 0.4 grams per MJ of digestible energy, respectively.