Protein as essential feed nutrient for growing pigs
2002
Leontjeva, I. (Estonian Agricultural Univ., Tartu (Estonia). Inst of Animal Science)
The feed protein requirement of growing pigs is relatively high, whereas it is impossible to meet the need for protein only with cereals. Protein feeds are rather expensive. For supplying the need for feed protein, it is important to pay attention to the amino acid content of protein. There is no feed with ideal amino acid content. It is possible to achieve an optimum amino acid content by using different feeds or synthetic amino acids. Excess of feed protein increases feed cost and causes higher nitrogen load to the environment. Lack of feed protein does affect growth performance. According to the literature, there are no responses to the decrease in a feed protein content if the lysine content in feed protein is adequate and the content of other amino acids corresponds with lysine respectively to ideal protein model. it was observed that the optimum feed protein content was different for boars, castrates and gilts. For boars the feed protein content should be higher. For growing pigs the highest growth rates were found with lysine concentrations of 11.2; 10.1 and 10.9 g/kg diet, and crude protein concentrations of 171; 157 and 168 g/kg diet for boars, castrated males and gilts, respectively. For finishing pigs growth performance was improved by increasing lysine content to 9.1; 7.2 and 8.4 g/kg diet, and crude protein content to 142; 116 and 132 g/kg diet for boars, castrates and gilts, respectively
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