Efficiency of the utilization of the energy of food in piglets, after weaning | The Journal of Agricultural Science | Cambridge Core (original) (raw)

Summary

The efficiency of utilization of the energy of food by weaned pigs of the Large White breed was measured. Three diets based on maize (40–60%) had a metabolizable energy of 75·8±1·2% of the gross energy, and 78·2 ±3·4% of the metabolizable energy was present as net energy.

The maintenance requirement of metabolizable energy of pigs weighing 14·3 ± 2·1 kg was 143·6 kcal/kg°0·75/24 h (601 kJ/kg0·75/24 h).

The energy cost per g protein and fat synthesized by piglets was estimated to be 7·43 and 12·05 kcal (31·1 and 50·4 kJ) metabolizable energy, respectively.

Equations for calculation of metabolizable energy (_Y_l, kcal) and of the net energy (_Y_2, kcal), based on digested nutrients, were:

Y1 = 4·64×1 + 9·12×2 + 4·25×3'CV = ± 1·2%,

Y2 = 3·84×1 + 7·09×2 + 3·28×3'CV = ± 1·4%,

where _X_1 = g protein digested, _X_2 = g fat digested, _X_3= g carbohydrate digested (crude fibre × N-free extracts).

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