Nutritional control of growth

Growth rate Age at slaughter (weeks) High-high 20 High-iow 28 Low-high 28 Low-iow 46 

After McMeekan CP 1940 Journal of Agricultural Science, Cambridge 30 511. 

Plotted from the data of Lawrence T L J and Pearce J 96A Journal of Agricultural Sdence. Cambridge 63 5. 

Feeding standards are statements of the amounts of nutrients required by animals. They may be expressed as nutrient requirements or, with the addition of a safety margin, as nutrient allowances. In the UK, the 

When animals are kept at low environmental temperatures, their heat losses, and hence their energy requirements for maintenance, are increased. An animal s thermoneutral range is defined by its lower and higher critical temperatures and is affected by climatic conditions (sun, wind and rain), the insulating properties of the animal and its environment, and food intake. In young animals brown adipose tissue may be metabolised 

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