Intramuscular fat and fatty acid profile of muscle of lambs finished in irrigated pasture

Figures & data

Table 1. Chemical composition of Tanzania grass (Panicum maximum Jacq cv. Tanzania) and concentrate (corn − 48%, cotton cake − 35%, soybean meal − 15%, limestone −1%, mineral salt − 1%).

	Tanzania grass	Concentrate
Dry matter (DM)%	28.46	86.92
Organic matter (% DM)	87.34	92.74
Crude Protein (% DM)	11.29	25.26
Ashes (% DM)	12.65	4.06
Ether extract (% DM)	2.61	2.78
Neutral detergent fibre (% DM)	69.93	20.83
Acid detergent fibre (% DM)	38.5	11.49
Lignin (% DM)	4.47	2.14
In vitro digestibility of DM (% DM)	54.4	75.37
Total digestible nutrient (% DM)	49.08	76.13

Figure 1. Total intramuscular fat content (mg/g) according to genetics groups (F1=½ Dorper×½ Morada Nova, MO, Morada Nova; SI, Santa Inês; SO, Brazilian Somali).

Table 2. Least square means±standard error on the fatty acid profile (% of total) in Longissimus muscle of ½ Dorper×½ Morada Nova (F1), Morada Nova (MO), Santa Inês (SI) and Brazilian Somali (SO) lambs.

	Genetic groups
	F1 (n=8)	MO (n=6)	SI (n=13)	SO (n=7)
Fatty acids
Capric acid (C10:0)	0.03±0.01 ab	0.00±0.00 b	0.04±0.01 ab	0.09±0.03 a
Lauric acid (C12:0)	0.26±0.06	0.33±0.07	0.26±0.04	0.34±0.06
Myristc acid (C14:0)	0.30±0.03 b	0.30±0.03 b	0.32±0.02 b	0.58±0.03 a
Pentadecanoic acid (C15:0)	0.46±0.03 b	0.49±0.04 b	0.50±0.03 b	0.86±0.06 a
Palmitic acid (C16:0)	23.71±3.08 b	24.01±3.48 b	23.68±2.42 b	28.11±2.46 a
Palmitoleic acid (C16:1)	0.60±0.04 b	0.61±0.05 b	0.65±0.04 b	1.28±0.07 a
Palmitoleate (C16:1n7)	–	–	0.10±0.04	–
Heptadecanoic acid (C17:0)	1.51±0.15	1.58±0.18	1.50±0.12	1.70±0.17
cis-10Heptadecanoic acid (C17:1)	0.05±0.01	0.03±0.001	0.12±0.01	0.09±0.01
Stearic acid (C18:0)	27.58±2.63 a	25.47±3.16 ab	27.25±2.07 a	19.77±3.32 b
Elaidic acid (C18:1n9t)	1.60±0.13	1.87±0.19	2.43±0.18	1.23±0.11
Oleic acid (C18:1n9c)	29.14±3.40 ab	26.01±4.27 ab	25.54±2.94 b	32.15±3.38 a
Linolelaidic acid (C18:2n6t)	–	–	0.03±0.01	0.02±0.01
Linoleic acid (C18:2n6c)	6.60±0.16 ab	9.50±0.22 a	4.79±0.08 bc	3.49±0.09 c
CLA – Conjugated linoleic acid (C18:2c9T11)	0.53±0.01 b	1.24±0.03 a	0.42±0.00 b	0.53±0.01 b
α-Linolenic acid (C18:3n3)	0.60±0.06	0.47±0.06	0.50±0.04	0.23±0.03
Gamma-linolenic acid (C18:3n6)	0.04±0.01	0.06±0.01	0.05±0.01	0.02±0.00
Eicosenoic acid (C20:1)	–	–	0.02±0.01	–
cis-11. 14. 17 Eicosatrienoic acid (C20:3n3)	–	–	0.04±0.01	–
cis-8. 11. 14 Eicosatrienoic acid (C20:3n6)	–	–	0.01±0.01	–
Arachidonic acid (C20:4n6)	2.35±0.12 a	1.76±0.08 ab	1.24±0.04 ab	0.75±0.03 b
Eicosapentaenoic acid (C20:5n3)	0.01±0.001	0.03±0.01	0.02±0.001	–
Adrenic acid (C22:4n6)	–	–	0.01±0.01	0.03±0.01
Lignoceric acid (C24:0)	0.02±0.0001 b	0.08±0.0001 ab	0.00±0.001 b	0.31±0.001 a

^a,b,c Least square means in the same row with different letters are different by Tukey-Kramer Test (P<0.05).

Table 3. Least square means±standard error on the fatty acid profile (% of total) according to classification of saturation and indices of Δ9 desaturase activity in Longissimus muscle of ½ Dorper×½ Morada Nova (F1), Morada Nova (MO), Santa Inês (SI) and Brazilian Somali (SO) lambs.

	Genetic groups
	F1	MO	SI	SO
TOTAL SFA	57.85±9.02	56.82±10.96	58.33±6.92	59.40±8.96
TOTAL MUFA	33.33±2.88	28.47±3.32	31.90±2.26	34.98±3.07
TOTAL PUFA	9.75±0.77 ab	14.19±1.11 a	6.93±0.49 bc	4.85±0.59 c
TOTAL UFA	42.55±2.94	44.18±3.39	39.85±2.30	40.11±3.14
UFA/SFA	0.72±0.07	0.76±0.09	0.65±0.05	0.67±0.07
PUFA/SFA	0.21±0.01 ab	0.30±0.01a	0.14±0.01 bc	0.08±0.01 c
EFA	7.29±0.56 ab	10.02±0.75 a	5.20±0.36 bc	3.58±0.40 c
TOTAL n-3 PUFA	0.69±0.07 ab	0.80±0.09 a	0.61±0.05 ab	0.23±0.04 b
TOTAL n-6 PUFA	8.51±0.73 ab	12.02±1.11 a	5.89±0.46 bc	4.07±0.60 c
n-6/n-3	11.22±0.85	11.48±1.08	6.76±0.57	6.03±0.93
Atherogenic index	0.82±0.10 b	0.83±0.11 b	0.92±0.08 b	1.28±0.10 a
Δ9 desaturase
C18:1n9c/(C18:0+C18:1n9c)	0.52±0.06 b	0.51±0.07 b	0.47±0.06 b	0.62±0.05 a
C16:1/(C16:0+C16:1)	0.02±0.001 b	0.02±0.001 b	0.03±0.001 b	0.04±0.001 a
(C18:1n9c+C16:1)/(C18:0+C18:1n9c+C16:0+C16:1)	0.37±0.01 ab	0.35±0.01 ab	0.31±0.01 b	0.41±0.01 a

^a,b,c Least square means in the same row with different letters are different by Tukey-Kramer Test (P<0.05); SFA, saturated fatty acids; MUFA, monounsaturated fatty acids; PUFA, polyunsaturated fatty acids; UFA, unsaturated fatty acids; EFA, essential fatty acids; n-6: (C18:2n6t+C18:2n6c+C18:3n6+C20:3n6+C20:4n6+C22:4n6); n-3: C18:3n3+C20:3n3+C20:5n3+C22:6n3); atherogenic index: [C12:0+(4*C14:0)+C16:0)/UFA].