Abstract
A growth experiment was conducted to study the effect of different lysine supplementation levels of barley wet distillers’ solids (WDS) diets on the performance and the carcass quality of pigs (25.5-95.5 kg live weight). A total of 160 pigs were divided into four groups of 40 animals. Four pigs of the same sex were placed in each pen and fed one of the four experimental diets; a barley-soyabean meal (SBM) control diet (167 g crude protein (CP) /kg dry matter (DM) and 7.6 g lysine/feed unit (FU)) or three similar barley-WDS diets (204 g CP/kg DM) which were supplemented with synthetic lysine to contain 7.7, 9.2 or 10.7 g lysine/FU. Lysine supplementation linearly improved the daily weight gain (DG) and feed conversion ratio (FCR) of the pigs during growing (1-5 weeks) (p < 0.001), finishing (6th week onward) (p < 0.001) and the whole experimental period (p < 0.001). However, during the whole growing-finishing period the performance of the pigs levelled off at the lysine level of 9.2 g/FU and daily supply of 18.0 g, respectively(quadratic effect: p < 0.05 for DG and p < 0.01 for FCR). The pigs on the SBM diet grew faster and more efficiently than did the pigs on the WDS diets with similar lysine content (p < 0.05).
Highlights
The amino acid composition of grain protein, and especially lysine content, is insufficient when compared to the requirements of growing pigs
It was noticed that the pigs on wet distillers’ solids (WDS) diets (2, 3, and 4) tended to eat their daily allowance more slowly than those on soyabean meal (SBM) diet did
The variation in the content of crude protein (CP) and lysine was still evident and caused fluctuations in the supply of protein and amino acids, which may have influenced the performance of the pigs
Summary
The amino acid composition of grain protein, and especially lysine content, is insufficient when compared to the requirements of growing pigs. J. et al: Lysine supplementation ofbarley wet distillers’ solids dietsfor growing-finishing pigs tion in pigs to the level of soyabean meal (SBM) (Valaja and Näsi 1996). The digestibility of amino acids and protein in WDS has been high in the former experiments (Näsi and Aimonen 1992, Valaja and Näsi 1996, Buraczewska et al 1996). Because of the conflicting results in the performance and digestibility experiments, more information was needed on the suitability of wet distillers’ solids for growing-finishing pigs and the optimal lysine supplementation of the diet. The objectives of the present experiment were to determine the effects of increasing lysine supplementation in WDS diets on the performance and carcass quality of growing-finishing pigs and, to set an optimal lysine supply level for WDS. The performance responses of the pigs on the WDS diets were compared to those of the pigs on the conventional SBM diet
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