POSSIBILITY OF REPLACEMENT OF SOYBEAN AND MAIZE MEAL IN DUCK BROILER DIETS BY RAPESEED, PEA, WHEAT AND BARLEY

The aim of this experiment was to propose and test formulae of feeding mashes for the duck broiler production in which extracted soybean and maize meal were fully or partially replaced by rapeseed meal, pea, wh eat and barley. Three mixtures were tested on two genotypes of pekin d uck with the sex ratio 1 : 1. 1 200 ducklings of each genotype were ho used in warm rearing house (19 birds/m2) with a run till the age of 21 weeks and from the 22nd weeks till the end of the test in cold rearin g house (7.7 birds/m2) also with a run. All technological procedures w ere similar like during the test at International Poultry Testing Stat ion at Ustrasice. Within each genotype, the ducklings were divided int o three groups: each group was placed in two boxes with 200 birds in e ach. From the 1st to the 21st day of age all ducklings were fed ad lib itum with the starter crumbled mash, from the 22nd to the 49th day wit h grower pelleted diets, differing in their composition (Tab. I). Mixt ure 1 was used as standard. Live weight at the age of 49 days, mortali ty, total feed consumption, carcass weight, abdominal fat. the weight of breast and leg muscles were determined. Traits measured on individu als were analyzed by the model (1), traits measured on box basis (mort ality and feed consumption) were analyzed according to model (2), wher e y(ijkl) is the value of the 1-th individual of the k-th sex, receivi ng the j-th diet and belonging to the i-th genotype, y(ij) is the valu e of the box where birds from the i-th genotype are housed receiving t he j-th diet, mu is the general mean, g(i) is the effect of the i-th g enotype, v(j) is the effect of the j-th diet, p(k) is the effect of th e k-th sex, (gv)ij, (gp)ik, (vp)jk, (gvp)ijk are the appropriate inter action effects, e(ijkl) the residual effect for models (1) and (2), re sp. All calculations were carried out using the procedure GLM of SAS. For all diets the meat performance of the duck broilers was at a good level at the end of the experiment; the live weight was 2.93 - 3.0 kg, feed conversion 2.94 - 3.16 kg, carcass percentage 61.0 - 62.4%, abdo minal fat 2.97 - 3.91 %.The live weight, carcass percentage, percentag e of breast and leg muscles, percentage of abdominal fat, feed consump tion and mortality were not influenced by the diet. Several characteri stics (live weight, percentage of breast muscles and fat percentage) w ere significantly influenced by the genotype. Using native sources of nutrients may considerably reduce the production costs of duck broiler growing (Tab. IV).