Low drying temperature has negligible impact but defatting increases in vitro rumen digestibility of insect meals, with minor changes on fatty acid biohydrogenation

Table 2 Fatty acid profile of the insect meals, g/100 g total FA (unless otherwise stated)

Item	Full-fat meals obtained with different drying temperature^a								Defatted meals with different residual ether extract content^b
Item	HI 40 °C	HI 50 °C	HI 60 °C	HI 70 °C	TM 30 °C	TM 50 °C	TM 60 °C	TM 70 °C	HI 19.7	HI 12.8	HI 9.2	HI 7.0	HI 4.7	TM 8.1	TM 5.7
C10:0	0.24	0.22	0.23	0.24	0.34	0.29	0.23	0.21	0.45	1.19	1.03	1.17	1.27	0.67	1.10
C12:0	46.7	46.8	50.2	49.1	0.33	0.29	0.26	0.26	36.3	35.9	43.9	32.8	34.4	0.39	0.33
C14:0	10.5	10.7	11.5	11.4	3.31	3.15	3.11	3.04	8.37	10.2	10.1	8.34	8.50	2.33	2.86
C16:0	12.9	13.6	14.8	14.5	18.6	17.8	17.8	17.6	16.6	19.2	16.5	19.2	17.3	19.4	16.8
C16:1 c9	2.17	2.17	2.17	2.14	1.53	1.48	1.47	1.46	3.07	2.69	3.57	3.01	4.67	0.92	1.40
C18:0	3.00	3.23	3.52	3.44	3.52	3.33	3.40	3.34	3.12	4.51	3.24	4.26	3.37	5.91	4.61
C18:1 c9	10.6	11.0	11.0	10.6	36.9	36.3	36.3	36.2	12.8	18.3	13.6	21.0	16.6	33.9	38.7
C18:2 n-6	10.9	9.5	4.42	6.07	31.4	33.3	33.3	33.7	16.4	5.82	5.48	6.96	10.4	31.8	30.6
C18:2 c9t11^c	0.61	0.43	0.18	0.26	0.03	0.03	0.04	0.02	0.38	0.06	0.24	0.08	0.31	0.06	0.04
C18:3 n-3	0.78	0.64	0.23	0.38	1.41	1.59	1.55	1.64	1.18	0.28	0.47	0.45	1.12	1.40	1.32
Other^d	1.60	1.71	1.75	1.87	2.63	2.44	2.54	2.53	1.33	1.85	1.87	2.73	2.06	3.22	2.24
Total SFA	74.0	75.2	80.8	79.2	26.6	25.3	25.4	25.0	65.6	71.7	75.6	66.7	65.9	29.6	26.3
Total BCFA	0.56	0.65	0.57	0.63	0.93	0.89	0.85	0.86	0.22	0.48	0.38	0.77	0.40	0.72	0.68
Total MUFA	13.8	14.3	14.0	13.7	39.7	38.9	38.9	38.8	16.6	21.8	18.1	25.0	22.2	36.5	41.1
Total PUFA	11.7	9.91	4.66	6.45	32.8	34.9	34.9	35.4	17.6	6.10	5.95	7.46	11.6	33.2	32.0
Total FA, g/kg DM	226	235	201	218	219	213	243	208	143	71.2	75.8	58.0	45.5	78.5	56.5

FA Fatty acids, HI Hermetia illucens, TM Tenebrio molitor, c cis, SFA Saturated fatty acids, BCFA Branched-chain fatty acids, MUFA Monounsaturated fatty acids, PUFA Polyunsaturated fatty acids, DM Dry matter
^aFull-fat insect meals obtained applying different drying temperatures: HI meals processed at 40 °C (HI 40 °C), 50 °C (HI 50 °C), 60 °C (HI 60 °C) and 70 °C (HI 70 °C); TM meals processed at 30 °C (TM 30 °C), 50 °C (TM 50 °C), 60 °C (TM 60 °C) and 70 °C (TM 70 °C)
^bDefatted insect meals containing different residual ether extract (EE) content: HI meals containing 19.7 (HI 19.7), 12.8 (HI 12.8), 9.2 (HI 9.2), 7.0 (HI 7.0) and 4.7 (HI 4.7) g EE/100g DM; TM meals containing 8.1 (TM 8.1) and 5.7 (TM 5.7) g EE/100g DM
^cCoeluted with C18:2 t8c10 and C18:2 t7c9
^dOther: C14:1 c9 + C15:0 + C15 iso + C15 aiso + C16 iso + C17:1 c9 + C17 iso + C17 aiso + ∑C18:1 t + C18:1 c11 + C18:1 c12 + C18:1 c14 + C18:1 t16 + C20:0 + C22:0 + C18:3 n-6 + C20:1 c9 + C20:1 c11 + C20:2 n-6 + C20:3 n-6 + C22:1 n-9 + C20:3 n-3 + C20:4 n-6

ISSN: 2049-1891