Nutritional evaluation of two agroindustrial by-products for ducks and pigs

Forty-eight male White Pekin ducks and 24 crossbred barrows (Landrace or Yo rkshire sows; PIC Line 355 boars) were used in three experiments to evaluat e the nutritional value of two by-products generated from agricultural indu stries. In each experiment, test ingredients consisted of a dried meat solu bles product (DMS) from swine processing facilities and a yeast fermentatio n product (YFP) from a commercial source. Soybean meal (SBM) with a CP cont ent of 48% served as the control ingredient in the three experiments. Diffe rent batches of each byproduct were evaluated in the three experiments util izing an apparent ME (AME) assay for poultry (Exp. 1 and 2) and a digestibi lity assay for barrows (Exp. 3). The nitrogen-corrected AME (AME(n)) for SB M, DMS, and YFP in Exp. 1 were 2.909, 2.801, and 3.292 kcal, respectively. The AME(n) for SBM, DMS and YFP in Exp 2 were 2.809, 3.207, and 3.565 kcal, respectively. In Exp. 3, diets were formulated such that the test ingredie nts provided the sole source of amino acids in each experimental diet. The AME of SBM, DMS, and YFP in Exp. 3 were 3.844, 2.208, and 3.552 kcal, respe ctively. Based on the results of the ME assay for poultry, the DMS product compares well to SBM and seems to be suitable for feeding to ducks. The YFP does not seem to be suitable for feeding nonruminant species based on poor ability to support nitrogen retention in both species (-36% and -20% in Ex p. 1 and 2, and 20% in Exp. 3).