Suitability of Hermetia illucens larvae meal and fat in broiler diets: effects on animal performance, apparent ileal digestibility, gut histology, and microbial metabolites

Table 7 Short-chain fatty acid (SCFA) concentrations in caecal digesta of broilers

Items	Protein × Fat						SE	P-value	Protein (LSMean)		SE	P-value	Fat (LSMean)			SE	P-value
	S + 0 L	S + 50 L	S + 100 L	L + 0 L	L + 50 L	L + 100 L	SE	P-value	S	L	SE	P-value	0 L	50 L	100 L	SE	P-value
SCFA, mmol/kg fresh matter
Acetic acid	102	99.1	120	113	97.0	101	8.168	0.035¹	107	104	6.888	0.425	107^uv	98.0^v	110^u	7.229	0.070
Propionic acid	14.0	12.3	13.4	15.1	13.7	12.5	2.036	0.695	13.2	13.7	1.633	0.682	14.6	13.0	12.9	1.742	0.483
Butyric acid	17.5	19.9	23.1	18.3	16.4	17.3	1.667	0.113	20.2	17.3	1.119	0.031	17.9	18.2	20.2	1.278	0.262
Valeric acid	2.02	2.22	2.12	1.91	2.30	1.82	0.314	0.756	2.02	2.01	0.239	0.579	1.97	2.26	1.97	0.260	0.406
BCFA, mmol/kg fresh matter
Isobutyric acid	1.82	1.76	2.07	1.64	2.03	1.37	0.596	0.429	1.88	1.68	0.516	0.501	1.73	1.90	1.72	0.537	0.862
Isovaleric acid	0.29	0.31	0.30	0.16	0.32	0.15	0.181	0.657	0.30	0.21	0.165	0.274	0.22	0.32	0.22	0.169	0.527

S, soybean meal; L; 15% of SBM crude protein substituted with HI larvae meal CP; S + 0 L, SBM + 0 HI larvae fat; S + 50 L, SBM + 50% HI larvae fat; S + 100 L, SBM+ 100% HI larvae fat; L + 0 L, HI larvae meal+ 0% HI larvae fat; L + 50 L, HI larvae meal+ 50% HI larvae fat; L + 100 L, HI larvae meal + 100% HI larvae fat
^u,v indicate differences by trend (0.05 ≤ P ≤ 0.10) for the main effect of fat source
¹post hoc test Tukey P > 0.10
SE Standard error

ISSN: 2049-1891