A short note on the effects of low-protein diets supplemented with biosynthetic amino acids on growing-finishing pig performance.
1994
Askbrant S. | Haakansson J. | Andersson K. | Svensson C. | Malmloef K.
In the outline of the ideal protein concept in animal nutrition, the present short study was intended to complement more fundamental research of protein metabolism in the pig and was focusing on pig performance when reducing dietary protein by elaborated levels of lysine, threonine and methionine worked out from earlier research. In one performance trial with 96 animals, the effects of reduced dietary crude protein (CP) content from 15.8 (control) to 13.5% on growing-finishing pigs were investigated. Three iso-caloric diets were used, a control diet and two low protein (LP) diets all based on barley and wheat mixed with soyabean meal. Growth promotors and antibiotics were excluded from all diets. Lysine, methionine and threonine content between diets was kept constant at 8, 3 and 5 g/kg, respectively, by addition of crystalline L-lysine-HCl, DL-methionine and L-threonine. In the second LP diet the ratio of threonine:lysine was enhanced from 0.62:1 to 0.75:1. The first LP diet of 13.5% CP supplemented with crystalline amino acid admixtures, significantly improved the performance of pigs. The daily weight gain (DWG) increased and the feed conversion (FC) was reduced compared to animals on the control diet. The second LP diet (13.5% CP) comprising an enhanced threonine:lysine ratio, did not improve the pig performance compared to the first LP diet although maintained a significant lower FC compared to the control animals. There were no differences in carcass quality or health status between animals on control and LP diets.
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