Abstract
The objective of this study was to measure protein quality parameters (PPV, NPU and NPUstd) of chicken diets with complete substitution of soybean meal (SBM) by Spirulina meal (SM) or partly defatted Hermetia meal (HM). N balance experiments were based on the quantitative excreta collection method, divided into starter period (10 - 20 d) and grower period (25 - 35 d). The study utilized 70 all male meat type chicken (Ross 308). Data assessment applied the exponential N utilization model of the “Goettingen approach”. The control diet was based on wheat, corn and SBM. In four experimental diets SBM was completely substituted by SM or HM, but fortified with feed amino acids (AA) both on a basic level of supplementation (Lys and Met added equal to the control diet) and on an extended level (Lys, Met, Thr, Arg, Val, Ile, His added). At a basic level of AA supplementation, complete replacement of SBM by SM or HM in chicken diets depressed dietary protein quality significantly (p 0.05). However, the extended level of AA supplementation improved protein quality parameters of the diets with both of the alternative proteins significantly (p
Highlights
Soybean meal (SBM) is the major ingredient to meet protein and amino acid (AA) requirements in mixed diets for growing chickens
In four experimental diets soybean meal (SBM) was completely substituted by Spirulina meal (SM) or Hermetia meal (HM), but fortified with feed amino acids (AA) both on a basic level of supplementation (Lys and Met added equal to the control diet) and on an extended level (Lys, Met, Thr, Arg, Val, Ile, His added)
The lowest daily N balance was observed for the SM (A) diet and the HM (A) N balance was significantly higher than the SM (A) group; yet both groups remained significantly below the control diet
Summary
Soybean meal (SBM) is the major ingredient to meet protein and amino acid (AA) requirements in mixed diets for growing chickens. Soybeans are a basic component of human nutrition and in competition with uses for raising livestock and poultry. Increasing the amount of arable land used for cultivation is an unfeasible strategy due to the growing density of industrial and private building development as well as the associated negative consequences of accelerated soil erosion and desertification. The search for alternative sources to close the protein gap in animal feeding is essential. The major challenge facing the poultry industry is the supply of feeds that will contain all the necessary dietary components for birds to grow efficiently
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