Table 7.

Apparent fatty-acid digestibility coefficients along the gastrointestinal tract and excreta, and apparent metabolizable energy according to different fat sources in the diet in 37-day-old broiler chickens.¹

	Dietary treatments2								Fat3		FFA%4				P values
	Unsaturated – S diets				Saturated – P diets
Item	S5	S15	S35	S50	P5	P15	P35	P50	S	P	5	15	35	50	SEM	Fat	FFA	Interaction
Jejunum
TFA	0.84a	0.84a	0.84a	0.79a	0.71b	0.66b	0.68b	0.70b	0.83	0.69	0.77	0.75	0.76	0.75	0.005	***	NS	*
SFA	0.64	0.64	0.64	0.53	0.60	0.56	0.57	0.64	0.61	0.59	0.62	0.60	0.60	0.59	0.012	NS	NS	*
MUFA	0.83	0.83	0.82	0.78	0.81	0.78	0.78	0.80	0.81	0.79	0.82	0.81	0.80	0.79	0.005	*	NS	*
PUFA	0.91	0.92	0.93	0.90	0.77	0.69	0.73	0.77	0.91	0.74	0.84	0.81	0.83	0.84	0.006	***	NS	NS
Ileum
TFA	0.92	0.90	0.90	0.86	0.79	0.75	0.77	0.79	0.89	0.78	0.85	0.82	0.83	0.83	0.006	***	NS	NS
SFA	0.81a	0.76ab	0.77ab	0.69abc	0.68bc	0.60c	0.66bc	0.69abc	0.76	0.66	0.74	0.68	0.72	0.69	0.010	***	NS	*
MUFA	0.91a	0.89ab	0.90ab	0.86b	0.88ab	0.86b	0.88ab	0.89ab	0.89	0.88	0.90	0.88	0.89	0.87	0.004	NS	NS	*
PUFA	0.95	0.95	0.95	0.93	0.86	0.86	0.88	0.87	0.95	0.87	0.91	0.91	0.91	0.90	0.003	***	NS	NS
Excreta
TFA	0.86	0.83	0.82	0.79	0.74	0.69	0.69	0.70	0.82	0.71	0.80a	0.76b	0.75b	0.75b	0.005	***	**	NS
SFA	0.78	0.72	0.72	0.67	0.65	0.55	0.54	0.57	0.72	0.58	0.71a	0.63b	0.63b	0.62b	0.008	***	***	NS
MUFA	0.87a	0.84abc	0.82bc	0.80c	0.85ab	0.84abc	0.84abc	0.85ab	0.83	0.84	0.86	0.84	0.83	0.82	0.004	NS	**	*
PUFA	0.88a	0.86ab	0.85ab	0.82bc	0.75d	0.75d	0.78cd	0.77d	0.85	0.76	0.82	0.80	0.82	0.79	0.004	***	NS	**
AME5	3,019a	3,013a	2,987a	2,840cd	2,985ab	2,896bc	2,758d	2,870c	2,965	2,877	3002	2955	2873	2855	6.955	***	***	***

Abbreviations: MUFA, monounsaturated fatty acids; PUFA, polyunsaturated fatty acids; SFA, saturated fatty acids; TFA, total fatty acids.

P-values were obtained from the univariate GLM procedure of SPSS conducted to study whether the dietary treatments, the dietary fat saturation degree and the dietary FFA percentage affected the fatty-acid digestibility results.

*P < 0.05; **P < 0.01; ***P < 0.001.

^a-dmeans in a row not sharing a common superscript letter are significantly different (P < 0.05).

¹Diets supplemented with 6% of an unsaturated (S) or saturated fat source (P): S5 - 100% crude soybean oil, S15 - oil blend with 70% crude soybean oil and 30% acid soybean oil from chemical refining (SA), S35 - oil blend with 30% crude soybean oil and 70% SA, S50 - 100% SA, P5 - 100% crude palm oil, P15 - oil blend with 80% crude palm oil and 20% palm fatty acid distillate from physical refining (PA), S35 - oil blend with 53% crude palm oil and 47% PA, S50 - oil blend with 33% crude palm oil and 66% PA.

²Values are means of 6 cages with 3 chickens/cage.

³Values are means of 24 cages with 3 chickens/cage.

⁴Values are means of 12 cages with 3 chickens/cage.

⁵Apparent metabolizable energy (kcal/kg). Values are pooled means of 6 replicates with 3 chickens/replicate.