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Signal grass (Brachiaria decumbens)

Description and recommendations

IMPORTANT INFORMATION: This datasheet is pending revision and updating; its contents are currently derived from FAO's Animal Feed Resources Information System (1991-2002) and from Bo Göhl's Tropical Feeds (1976-1982).

Common names

Signal grass, signalgrass, sheep grass, Kenya sheep grass, Suriname grass; Spanish: braquiaria, decumbens, pasto alambre, pasto braquiaria, pasto chontalpo, pasto de la palizada, pasto de las orillas, pasto peludo, pasto prodigio, zacate prodigio; Portuguese: Australiano, braquiária, braquiária comum, braquiária de alho, capim braquiária, decumbens; Thai: Ya siknaentonnon, ya surinam (Miles et al., 1996)


Brachiaria bequaertii Robyns, Brachiaria brizantha sensu Senaratna, Brachiaria eminii (Mez) Robyns, Panicum eminii Mez, Urochloa decumbens (Stapf) R.D. Webster, Urochloa eminii (Mez) Davidse (Quattrocchi, 2006).

Brachiaria brizantha (Hochst. ex A. Rich.) Stapf and Brachiaria decumbens (Stapf) are very similar morphologically, which has led to incorrect identifications (Miles et al., 1996).


Trailing perennial with up to 60 cm stems. Suitable for humid areas with well-drained sandy soils. Withstands drought but not waterlogging. Valuable constituent of East African savannahs. Fairly high-yielding. Usually propagated by cuttings or tuft splits.

Potential constraints

A widespread sporadic toxicity syndrome associated with Brachiaria species is hepatogenous photosensitization. Sheep, goats and cattle develop skin lesions, facial edema, liver damage and ruminal stasis that result in severe drops in weight gain (down to 40%) and even in death if the animals are not removed from the pasture. This syndrome has been reported with ruminants grazing Brachiaria decumbens in Africa, Southeast Asia and South America (FAO, 2010; Lascano et al., 1996). The cause of toxicity appears to be the presence in bile ducts and hepatocytes of crystals of insoluble salts of sapogenin glucuronides originating from steroidal saponins present in the plant. Sapogenins content can vary in the same Brachiaria species due to environmental stress, plant age and developmental stage. Outbreaks of Brachiaria spp. poisoning in central western Brazil are frequently observed in pastures that had been more than 30 days without animals grazing. They also occur during the growing stage of the pastures at the start of the rainy season (Brum, 2009).

Tables of chemical composition and nutritional value


Readily grazed.


DATASHEET UNDER CONSTRUCTION. DO NOT QUOTE. Last updated on July 30, 2010, 16:48


Tables of chemical composition and nutritional value

IMPORTANT INFORMATION: This datasheet is pending revision and updating; its contents are currently derived from FAO's Animal Feed Resources Information System (1991-2002) and from Bo Göhl's Tropical Feeds (1976-1982).

Main analysis Unit Avg SD Min Max Nb
Dry matter % as fed 25.7 5.3 19.5 39.6 29
Crude protein % DM 8.2 3.5 1.9 14.1 53
Crude fibre % DM 31.2 5.4 22.6 39.7 40
NDF % DM 68.3 5.9 57.8 75.8 11 *
ADF % DM 36.9 4.6 30.1 45.7 22 *
Lignin % DM 5.0 1.2 3.6 7.8 13 *
Ether extract % DM 2.3 0.6 1.4 2.9 8
Ash % DM 8.7 1.8 5.4 12.2 52
Gross energy MJ/kg DM 18.1 2.8 15.4 20.5 3 *
Minerals Unit Avg SD Min Max Nb
Calcium g/kg DM 3.9 1.1 1.9 6.1 36
Phosphorus g/kg DM 2.3 1.2 0.6 4.4 36
Potassium g/kg DM 17.8 8.5 2.4 29.8 32
Sodium g/kg DM 0.5 0.4 0.6 2
Magnesium g/kg DM 2.1 0.6 1.4 3.8 36
Manganese mg/kg DM 148 65 83 281 9
Zinc mg/kg DM 30 17 10 76 11
Copper mg/kg DM 4 3 2 11 11
Iron mg/kg DM 707 140 1273 2
Ruminant nutritive values Unit Avg SD Min Max Nb
OM digestibility, Ruminant % 54.0 3.8 54.0 68.0 8 *
Energy digestibility, ruminants % 51.6 51.6 62.9 2 *
DE ruminants MJ/kg DM 9.3 9.3 12.9 2 *
ME ruminants MJ/kg DM 7.6 *
ME ruminants (gas production) MJ/kg DM 6.6 0.2 6.3 6.8 4
Nitrogen digestibility, ruminants % 58.9 13.2 33.5 71.0 8

The asterisk * indicates that the average value was obtained by an equation.


Abaunza et al., 1991; Aregheore et al., 2006; Aumont et al., 1991; Butterworth, 1963; CGIAR, 2009; CIRAD, 1991; Dougall et al., 1958; Evitayani et al., 2004; Evitayani et al., 2004; Gowda et al., 2004; Nasrullah et al., 2003; Xandé et al., 1989

Last updated on 27/11/2012 14:27:53




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