Table 2. Least squares means of nutrient digestibility for high (n = 32) and medium (n = 32) producing dairy cows receiving either calcium salts of fatty acids (Ca-FA) or high-palmitic acid (PA) during a heat stress period

Item	High production		Medium production		SEM	p-value
	PA	Ca-FA	PA	Ca-FA		PL	FS	PL × FS
DM	69.83	72.77	68.61	72.07	0.44	0.56	0.04	0.84
OM	72.32	73.67	71.72	73.33	1.31	0.47	0.05	0.85
CP	66.60	70.14	67.50	68.07	1.44	0.77	0.37	0.50
NDF	54.87	60.63	53.28	60.48	1.88	0.75	0.04	0.80
ADF	48.21	50.64	44.73	50.79	1.70	0.48	0.12	0.46
Fat	75.15	77.58	72.15	75.41	2.19	0.45	0.39	0.92

PL, production level; FS, fat source; PL × FS, interaction between production level and fat source; DM, dry matter; OM, organic matter; CP, crude protein; NDF, neutral detergent fiber; ADF, acid detergent fiber.