Voluntary intake H express on metabolic body weight (g / kg W 0.75 ) H pen feeding : cultivars and species H field measurement : sward structure, botanical composition, plant age and plant parts H I = T x R x S H I = N x S
Nutritional composition H Crude protein (%) H Crude fiber H Nitrogen free extract H Ether extract H Ash –Ca –P ect. H Energy H Neutral detergen soluble (cell content) H Neutral detergen fiber H Acid detergen soluble H Hemicellulose H ADF H Cellulose H Lignin
H Voluntary intake (g/kg/d) Intake Digestibility H Dry matter digestibility (DMD: %) H Oganic matter digestibility (DOM: %) H Total digestible nutrient (TDN: %) Excresion H Urine (g/d) H Feaces (g/d)
Toxic substance H Tannin H Hydrocyanic acid H Prussic acid H Mimisine H Nitrate H Oxalate
Frequency distribution of digestibility percent frequency 20 10 Dry matter digestibility (%) 30405060708090 Tropical species Temperate species
Leaf percentage, DMD, and VI of Panicum maximum cv. Kabulabula, cv. Burnett and Panicum maximum cv. Hamil KabulabulaBurnettHamil Leaf percentage283853 DMD (% in vivo)55.257.055.5 Voluntary intake (g/d/kgW 0.75 )22.214.171.124 Source : Minson (1971)
In vivo dry matter digestibility and voluntary intake of legume and grass of different age (Playne & Haydock, 1972) SpeciesAge DMD VI (days) (%)g/kgW 0.75 /d) Stylosanthes 44 5758 humilis110 5867 145 5569 Heteropogon 44 5553 contortus110 4331 145 4034
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