253
3 Results
3.1 Fatty Acid Composition in M. Longissimus Dorsi (LD)
The main fatty acids in LD were palmitic (C16:0), stearic (C18:0), oleic (C18:1)
and linoleic (C18:2) that together accounted for 52–76% of total fatty acid content
(Table 2). The proportions of palmitic, oleic, elaidic, linolelaidic, rumenic (a conjugated linoleic acid (CLA)), total monounsaturated (MUFA), trans-MUFA and total
desirable fatty acids (DFA – a total of all unsaturated fatty acids and stearic acid)
increased (P < 0.05) with level of supplementation. Similarly, n-6/n-3 ratio increased
(P < 0.05) with supplementation. The proportion of oleic, elaidic and trans-MUFA
in T100 goats was twice as high (P < 0.05), whereas that of CLA was about four
times higher than that recorded in T0 goats. However, T66 and T100 goats had comparable proportions of oleic, linolelaidic, CLA, total MUFA as well as n-6/n-3 polyunsaturated fatty acid (PUFA) ratio. On the other hand, the proportions of
myristoleic, linolenic, eicosatrienoic, arachidonic, eicosapentaenoic, docosapentaeFeeds
Chemical composition
Concentrate Grass hay
Dry matter (g/kg)
921.9
834.5
Organic matter
920.5
902.0
Crude protein
162.2
32.8
Ether extract
133.6
12.0
Crude fibre
145.8
353.3
Neutral detergent fibre
472.1
830.5
Acid detergent fibre
156.1
473.5
Ash
50.9
98.0
Nitrogen free extract
429.4
338.4
In vitro dry matter digestibility
545.6
395.5
In vitro organic matter digestibility 546.4
416.5
Metabolisable energy (MJ/Kg DM) 13.4
9.2
Fatty acids
C16:0 Palmitic
12.30
–
C16:1n7 Palmitoleic
0.10
–
C18:0 Stearic
2.90
–
C18:1n9c Oleic
33.10
–
C18:2n6c Linoleic
46.80
–
C20:0 Eicosanoic
0.50
–
C18:3n3 Linolenic
0.40
–
C22:0 Behenic
0.32
–
C22:1n9 Erucic
0.01
–
C24:0 Lignoceric
0.30
–
C22:5n3 Docosapentaenoic
0.03
–
C22:6n3 Docosahexaenoic
0.01
–
Table 1 Chemical
composition
(g/kg
DM) of concentrate
diet and grass hay and
fatty acid composition
(% of total fatty
acids) of concentrate
diet fed
Effects of Concentrate Supplementation on the Fatty Acid Composition of Fat Depots…
3 Results
3.1 Fatty Acid Composition in M. Longissimus Dorsi (LD)
The main fatty acids in LD were palmitic (C16:0), stearic (C18:0), oleic (C18:1)
and linoleic (C18:2) that together accounted for 52–76% of total fatty acid content
(Table 2). The proportions of palmitic, oleic, elaidic, linolelaidic, rumenic (a conjugated linoleic acid (CLA)), total monounsaturated (MUFA), trans-MUFA and total
desirable fatty acids (DFA – a total of all unsaturated fatty acids and stearic acid)
increased (P < 0.05) with level of supplementation. Similarly, n-6/n-3 ratio increased
(P < 0.05) with supplementation. The proportion of oleic, elaidic and trans-MUFA
in T100 goats was twice as high (P < 0.05), whereas that of CLA was about four
times higher than that recorded in T0 goats. However, T66 and T100 goats had comparable proportions of oleic, linolelaidic, CLA, total MUFA as well as n-6/n-3 polyunsaturated fatty acid (PUFA) ratio. On the other hand, the proportions of
myristoleic, linolenic, eicosatrienoic, arachidonic, eicosapentaenoic, docosapentaeFeeds
Chemical composition
Concentrate Grass hay
Dry matter (g/kg)
921.9
834.5
Organic matter
920.5
902.0
Crude protein
162.2
32.8
Ether extract
133.6
12.0
Crude fibre
145.8
353.3
Neutral detergent fibre
472.1
830.5
Acid detergent fibre
156.1
473.5
Ash
50.9
98.0
Nitrogen free extract
429.4
338.4
In vitro dry matter digestibility
545.6
395.5
In vitro organic matter digestibility 546.4
416.5
Metabolisable energy (MJ/Kg DM) 13.4
9.2
Fatty acids
C16:0 Palmitic
12.30
–
C16:1n7 Palmitoleic
0.10
–
C18:0 Stearic
2.90
–
C18:1n9c Oleic
33.10
–
C18:2n6c Linoleic
46.80
–
C20:0 Eicosanoic
0.50
–
C18:3n3 Linolenic
0.40
–
C22:0 Behenic
0.32
–
C22:1n9 Erucic
0.01
–
C24:0 Lignoceric
0.30
–
C22:5n3 Docosapentaenoic
0.03
–
C22:6n3 Docosahexaenoic
0.01
–
Table 1 Chemical
composition
(g/kg
DM) of concentrate
diet and grass hay and
fatty acid composition
(% of total fatty
acids) of concentrate
diet fed
Effects of Concentrate Supplementation on the Fatty Acid Composition of Fat Depots…