Final answer:
The provided information does not contain enough specific detail to accurately calculate the maintenance energy needs for an 80 lb growing lamb. Consulting established animal nutrition guidelines would provide the necessary information for such calculations.
Step-by-step explanation:
The question asks for the maintenance energy need in kcal of NEm/day for an 80 lb growing lamb. While the provided information does not directly supply a specific formula or value for calculating maintenance energy for a growing lamb, typical energy requirements for animals including growth, lactation, and maintenance are usually defined by established guidelines in animal nutrition. Generally speaking, the maintenance energy needs for livestock are calculated based on their body weight and growth rate, among other factors. As an estimation and without precise guidelines from the provided reference material, we cannot accurately calculate the maintenance energy need for the lamb. The student should refer to veterinary tables or animal nutrition books that specifically address energy requirements for growing lambs to find the correct value.