Sarcopenia
Protein intake and physical activity are important stimuli for muscle protein synthesis. A number of expert groups have proposed an increase in dietary protein recommendations for older age groups to 1.0-1.2 g/kg body weight per day.
Key nutrient supplementation in older adults is of interest in the prevention of sarcopenia and frailty, since it is a simple, low-cost treatment approach without major side effects.
Beef cattle
On average, cattle will consume 1.4 to 4% of their body weight daily. There are a range of types of feed available for these animals. The standard text in the United States, "Nutrient Requirements of Beef Cattle", has been through eight editions over at least seventy years. The 1996 seventh edition substituted the concept of "metabolizeable protein" for the sixth edition's "crude protein". In the 20th century, Canadian practice followed the American guidance. Already in 1970, the Food and Drug Administration was regulating pharmaceutical supplements in beef cattle feed such as hormones and prophylactic antibiotics.