Table 1.

Ingredient and nutrient composition of the diet for pregnant mares.

Ingredient	Content (%)	Nutrientb	Content (%)
Corn	37.50	OM	90.64
Oat	20.00	CP	17.57
Wheat bran	15.00	DM	92.13
Barley	10.00	NDF	13.06
Soybean meal	15.00	ADF	28.35
Premixa	1.00	Ca2+	1.01
Limestone	1.00	AP	0.43
NaCl	0.50
Total	100.00

^aThe premix provided the following per kg of concentrate supplement: 480 IU of vitamin A, 816.32 mg of vitamin B₁, 333.2 mg of vitamin B₂, 48.96 mg of vitamin B₆, 70.4 IU of vitamin D, 21,333.2 IU of vitamin E, and 20.46 mg of pantothenic acid, per kg of concentrate supplement, plus nicotinamide (484.85 mg), Cu (10.58 mg), Fe (5.56 mg), Mn (33.54 mg), Zn (30.92 mg), I (2.46 mg), Se (5.93 mg), and Co (1.11 mg);

^bThe nutritional levels of the concentrate were analytically determined.