Does the use of distiller’s dried grains with solubles (DDGS) in layer diets affect the nutrients digestibility and manure pollution by nitrogen and phosphorous?

Abstract

The objective of the current study was to examine the effect of the inclusion levels of distiller's dried grains with solubles (DDGS) which partially and fully replaced soybean meal (SBM) in laying hen diets with or without enzyme or vitamin E supplementation on nutrients digestibility and excreted nitrogen and phosphorous. For these purposes, a total of 180 Hisex Brown laying hens at 22 weeks of age were randomly distributed into 15 treatment groups in a 5 × 3 factorial design experiment including five levels of DDGS (0, 5.5, 11, 16.5 and 22% replaced for the same percent of SBM which represents 0, 25, 50, 75 and 100% respectively in the diet) and three levels of feed additives (without, 250 mg enzyme/kg diet or 200 mg vitamin E/kg diet) through 22-42 weeks of age. Results revealed that digestion coefficient values of nutrients including DM, OM, CP, EE, NFE and CF were more preferable in hens fed diets involved 25% DDGS instead of SBM than that of the control diet and other treatment groups. In contrast, hens fed 100% substitution of DDGS caused significant (P ≤ 0.01) decrease in digestibility coefficients of all nutrients. The amount of daily excreted N was decreased in hens fed 25 or 50% DDGS substitution, whilst feeding 75 or 100% DDGS led to an elevation in N excretion. The proportion of excreted phosphorous was statistically (P ≤ 0.01) decreased as the level of DDGS increased. Generally, neither enzyme nor vitamin E supplementation had any significant effect on the studied parameters. It could be concluded that DDGS could be used up to 50% as a replacement of SBM (11% of the diet) without any adverse effects on nutrients digestibility. Laying hen farms using DDGS up to 25 or 50% substituted for SBM in its diets (5.5 or 11% of the diet) will have clearer environment of nitrogen and phosphorous pollution than others whose diets free of DDGS.

Laying Performance, Physical, and Internal Egg Quality Criteria of Hens Fed Distillers Dried Grains with Solubles and Exogenous Enzyme Mixture

“…Multi-enzyme supplementation may improve the nutrients apparent digestibility by lowering the viscosity of digesta and improving nutrients digestion and absorption [54]. Enzymes also increase the solubilization and disruption of feed endosperm cell wall, which positively reflects on nutrients digestibility as documented by Patterson and Aman [55] and Abd El-Hack et al [56]. On the other hand, Shalash et al [32] found that digestibility of crude protein, ether extract, crude fibers, and nitrogen-free extract were not statistically impacted by multi-enzyme supplementation in broiler chickens.…”

Impacts of dietary inclusion of dried brewers’ grains on growth, carcass traits, meat quality, nutrient digestibility and blood biochemical indices of broilers

“…Increased feed costs and limited amounts of animal protein sources in poultry feed have led to the use of alternative plant proteins that make up some or all animal protein in feed (El Boushy et al, 2000;Vasso & Russ, 2007). Therefore, considerable attention has been given to the use of unconventional feedstuffs, such as agro-industrial by-products, in the formulation of poultry diets, with the intention of achieving suitable utilization and economic efficiency of poultry production (Alagawany et al, 2015;Abd El-Hack et al, 2017a;2017b).…”

Influences of dietary crude protein and stocking density on growth performance and body measurements of ostrich chicks

“…Results of the present work demonstrated that extra protein consumed by birds could not be productively utilized by ostrich chicks and were probably eliminated via fecal nitrogen as reported in previous publications (Ahmed et al 2011, Mahrose et al 2015. However, Bovera et al (2011) claimed that feed containing 17% CP was optimum for ostrich chicks at 20 weeks of age and feeding growing ostriches on higher protein levels not only wasteful but also pollute the environment through the excretion of more unutilized nitrogen (Abd el-Hack et al 2017. Due to these explanations, growth rate of the ostriches appeared to be influenced by other environmental factors (Deeming and Ayres 1993), such as stocking density.…”