4. The following data was obtained from forage samples collected using
quadrat to determine botanical composition:
Available DM (kg) Botanical composition (%)
Grass
0.0653
Legume
0.0162
Weeds
0.0051
Dead material
0.0052
(i) Calculate the proportion of grass, legume, weeds and dead material
in this forage
(ii) How many days will 8 calves (each consumes approximately 6.25
kg DM/day) remain on this pasture before forage material runs out i.e.,
until the amount of residual forage is 50% of current yield?
Assumptions:
• Area of pasture field = 2.1 Acres
• Area of quadrant = 17 inches * 17 inches
• One acre = 4,000 m²
• One inch = 2.54 cm = 0.0254 m
• Daily forage accumulation (growth) = 18.18 kg DM/Acre
(iii) How many calves are needed if this pasture must be grazed for 90
days and maintain 50% residual?
