A comparison of fecal settlement vis-to-vis stripping method to assess apparent digestibility coefficients of the animal and plant origin feedstuffs in sub-yearling beluga, Huso huso

Abstract

Apparent digestibility coefficients (ADCs) of feedstuffs are assayed for economic feed formulations and eco-friendly. ADCs of fourteen feedstuffs from three origins of feedstuffs were appraised in terms of apparent digestibility of crude protein (ADCCP), crude lipid (ADCCL), dry matter (ADCDM), and gross energy (ADCGE) for sub-yearling beluga, Husu huso, via stripping and settlement methods. The ingredients included four fishmeals, anchovy meal (AM), full-fat Anchovy meal (FFAM), tuna by-products (TBM), and miscellaneous carp by-products (MCM), three animal proteins, poultry by-product (PBM), blood meal (BM), and meat and bone meal (MBM), and six plant origin, wheat gluten (WG), corn gluten (CG), wheat meal (WM), corn meal (CM), canola meal (CAM), prepared soybean (PSM), and soybean meal (SM). A reference diet mixed with feedstuffs with 1% chromic oxide as the inert marker with a 70:30 ratio to produce test diets. In the settlement method, fish meal ADCs of dry matter fluctuated from 88.87% to 96.38%, and ADCCP from 89.41% to 94.90%, so that the highest and lowest (p < 0.05) values were observed in AM and TBM, respectively. A similar trend was observed in the stripping method compared to the settlement method with a decrease in the average ADCs by about 6%. In the animal protein, except for ADCGE, the lowest values of ADCDM, ADCCP, and ADCCL were observed in blood meal tested diet (p < 0.05), while the energy digestibility of meat and bone meal was notably lower than those of the other ingredients (p < 0.05). The mean ADCs of two methods of feces collection of plant protein feedstuffs were ranked behind fish meals and ahead of animal protein. The highest ADCDM, ADCCP, and ADCCL of botanic origin were observed in plant protein concentrate (gluten) (p < 0.05), and soybean products ranked second. The Univariate The Univariate Analysis of Variance test showed a interaction of fishmeal feedstuffs and method of fecal collection on ADCDM (P-value = 0.02) but ADCCL , ADCCP and ADCGE were not affected, so that the ADCDM of fishmeal sources in collection method was more than the digestibility in the stripping method. Interaction between animal protein feedstuffs and method of fecal collection affected to ADCCP and ADCCL.