. 2023 Mar 28;13:313–323. doi: 10.1016/j.aninu.2023.03.002

Table 6.

Apparent metabolizable energy (AME) and apparent total tract digestibility (ATTD) coefficients according to different fat sources and dietary FFA content.

Item	AME, kcal/kg DM of diet	ATTD of EE	ATTD of Ca
Experimental diet
S10	2,715^a	0.86^a	0.58
S20	2,675^ab	0.82^a	0.56
S30	2,474^d	0.70^bc	0.48
S45	2,490^d	0.73^b	0.48
P10	2,535^cd	0.72^b	0.42
P20	2,636^abc	0.73^b	0.51
P30	2,563^bcd	0.71^bc	0.46
P45	2,517^d	0.64^c	0.36
Fat source
Soybean	2,588	0.78^a	0.52^a
Palm	2,564	0.70^b	0.44^b
FFA content
10%	2,625^a	0.79^a	0.50^a
20%	2,657^a	0.77^a	0.53^a
30%	2,519^b	0.71^b	0.47^ab
45%	2,504^b	0.68^b	0.42^b
SEM¹	25.2	0.02	0.03
Effects, P-values
Fat source	0.176	<0.001	<0.001
FFA content	<0.001	<0.001	0.002
Fat source × FFA	<0.001	<0.001	0.055
Linear contrast², P-values
Overall	-	-	0.002
Soybean	<0.001	<0.001	-
Palm	0.217	0.002	-

S = soybean; P = palm; FFA = free fatty acids; EE = ether extract.

^a-d Means within each variable with more than 2 levels (experimental diet or FFA content) not sharing a common superscript differ according to Tukey's test (P < 0.05).

Pooled standard error of the means.

Linear responses to dietary FFA content.