Production of calcium salts of fatty acid from soap-stock on semi industrial scale and its use in finishing rations of friesian bulls [electronic resource].

Includes references.

The study was carried out to produce protected fat from industrial waste (soap¬ stock) on semi-industrial scale and to evaluate two levels of supplementation in finishing diets of Friesian bulls. Ten tons of calcium salts of fatty acids (Ca-SFA) was prepared from soap-stock on semi-industrial scale. Protected fat was added in pellet form as a surplus at rate of 4% and 8% of total dry matter intake of basal diet (control) of 18 Friesian bulls (375 Kg) in three similar groups. Processing had not influenced the proportion of fatty acids of soap-stock and the product is almost insoluble at pH from 4-6. Nutrient intake as TDN and DE (P<O.05) increased by about 15% for 4% Ca¬-SFA and 25% for 8% Ca-SFA groups. Final body weight, average .daily gain and protein efficiency improved. however. energy utilization had not significantly affected by feeding Ca-SF supplemented rations. Digestibilities of EE ,OM, DM and energy increased but digestibilities of crude protein, crude fiber and nitrogen free extract had not been affected .by fat supplement. Also, ruminal fermentation and nitrogen metabolism were not significantly affected except an increase in protozoa count and a decrease in ruminal pH. Ca-SFA increased the concentrations of plasma lipids and calcium. It could be concluded that soap-stock as an industrial waste could be efficiently utilized as animal feed to prepare protected fat which could be successfully incorporated up to 8 % of ration DM of fattening bulls. Keywords: Friesian bulls. calcium salts of fatty acids, growth.

Summary in Arabic.

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