Replacement of soyabean meal by white lupin cv. Bardo seeds and the effectiveness of beta-glucanase and xylanase in growing-finishing pig diets

The effect of white cv. Bardo lupin seeds on the fattening performance of 3 5 barrows weighing 24 to 96 kg was determined. In the first period of fatte ning (growing up to 65 kg) the proportion of lupin seeds in the diets was 0 , 8 and 14%, in the second period (finishing) 0, 14 and 20%. The amounts of lupin used replaced 0, 30 and 50% of soyabean meal in the growing, and 0, 75 and 100% in the finishing diets. The effectiveness of an enzymatic prepa ration containing beta-glucanase and xylanase supplementing diets with vary ing proportions of soyabean and lupin and barley (52-65%) was also studied. The digestibility of dietary nutrients, nitrogen balance, daily weight gai n and feed utilization were estimiated. The addition of white lupin seeds, containing 0.067% DM alkaloids, instead of soyabean meal did not have an unfavourable effect on nutrient digestibil ities or nitrogen retention. Daily weight gains and feed utilization in pig s fed mixtures with an 8% (growing) and then 14% (finishing) lupin were the same as in the control group receiving soyabean meal. The higher proportio n of lupin in the diets, i.e. 14% in the growing and 20% in the finishing d iet, significantly decreased the growth rate of the pigs and feed utilizati on. The addition of the beta-glucanase and xylanase preparation (0.1% Porzyme 9 100) increased only the digestibility of N-free extractives in the diets fo r young pigs (about 55 kg) and in both periods of fattening increased daily nitrogen retention. The daily gains were higher (3.6%) and the feed utiliz ation was better (4%) in pigs fed diets supplemented with enzyme preparatio n, but differences were not significant.