Botulinum toxins are the most lethal toxins known. For type A toxin, the toxic dose is estimated at 0.001 mcg/kg (Franz 1997); the lethal dose for a 70-kg person by the oral route is estimated at 70 mcg, by the inhalational route 0.80 to 0.90 mcg, and by the intravenous route 0.09 to 0.15 mcg (Sobel 2005).
1 hectare = 2.47105381 acres. .07 hectare= .17 acres per person. about 7500 square feet per person. While this figure produces a result of around 5-6 people per acre, there are plenty of caveats to consider. If the soil is not ideal, increase the land. If the growing season is short, increase the land.
If you apply 100 pounds actual nitrogen per acre, the cattle should consume about 3,500 pounds of dry matter forage per acre (4,000 pounds produced - 500 pounds not grazed). This will result in a gain of 438 pounds of beef per acre (3,500 pounds dry matter forage consumed Ã· 8 pounds dry matter per pound of gain).