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Methionine and threonine in grain based rations for piglets and growing pigs



Methionine and threonine in grain based rations for piglets and growing pigs



Zuechtungskunde 59(5): 378-391



In a feeding trial with 94 pigs in the range of 9 to 66 kg of body weight rations consisting mostly of grains and Leguminosae supplemented with DL-methionine and L-threonine were tested. The experiment was carried out in order to detect the limiting amino acids under sufficient lysine and restricted protein supply. The content of ME, minerals and vitamins was according to requirement standards. During the first experimental period piglets of 9 to 34 kg body weight were fed the basal rations supplemented with 0,6 to 1,8 g DL-methionine and 1,0 g L-threonine per kg of feed. The second experimental period was carried out with growing pigs in body weight ranges of 34 to 66 kg. The following results were obtained. In piglets the supplementation of 1,2-1,8 g DL-methionine and 1,0 g L-threonine gave significant better results in body weight gain (11%), feed-, energy- and protein utilization (near 5%). In growing pigs these observations showed the same tendency. During the two experimental periods the corresponding values were 9% (weight gain) and 5% (feed-, energy- and protein utilization). The supplementation of only one of the amino acids, DL-methionine or L-threonine, gave no better results because of amino acid imbalances in the rations. In rations based on grains methionine seems to be the first limiting and threonine the second limiting amino acid. The relation of threonine and methionine + cystine concentration to the lysine concentration in feed protein is recommended to be 0,7-0,65 for piglets and 0,65-0,6 for growing pigs.

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