Based on ongoing research, the poultry industry is utilizing increasingly more wheat distillers dried grains with solubles (wDDGS) as a feed ingredient. High fiber in wDDGS is a major factor contributing to reduced nutrient intake and digestion of nutrients in the diet. Hence, the research conducted looks at emerging technologies (e.g., enzymes and/or feed processes (extrusion) and/or wet feeding) to overcome the limitations in diets containing higher levels of WDDGS. The dietary treatments were evaluated by monitoring turkey performance and utilization of the nutrients. All dietary treatments in the respective experiments were formulated to meet or exceed the nutrient requirement of the Hybrid Converter turkey standards. With the exception of experiment 2 (0-72d) test diets were fed from 7-21d. In Experiment 1, 0 and 30% wDDGS diets were supplemented with protease (P+; 0.126 g/kg) or β-mannanase (M+; 0.05g/kg); further, diets containing 0, 10, 20 and 30% wDDGS with no enzyme were compared. A positive (P<0.05) main effect of 30% was reported for 21d body weight (BW) and feed conversion ratio (FCR). A significant main effect [21d apparent metabolizable energy (AME); 30%] and interactions [(enzymes x levels (0 and 30%); 21d AME and nitrogen retention (NR)] were found. A quadratic (P<0.01) response was found for FCR, that was superior for 30%. A quadratic (P<0.01) response was also found for both NR and AME; both were highest for 10% wDDGS diets. In Experiment 2, diets containing 0, 15 and 30% wDDGS with no enzyme were compared; further, the 30% wDDGS diet was supplemented with enzymes (protease or β-mannanase). Water intake per pen was monitored beginning at 7 d. There was no effect of dietary treatment on overall feed intake (FI) and body weight (BW). Total feed conversion ratio (FCR) (P<0.05; 0-72d) was significantly improved for birds fed 30% wDDGS regardless of enzyme treatment compared other dietary treatments. There were trends for higher water intake (mL/b/d) with 30%P+ diets as compared to the other diets. The higher water intake may be a factor of the higher fiber in this diet, but it was exacerbated by only the protease enzyme. Experiment 3 evaluated the effect of extrusion (EX) and an enzyme cocktail (E; 0.5g/kg) on wDDGS. Diets containing 0, 15 and 30% wDDGS with/without enzyme were tested; further, the 15 and 30% wDDGS with/without EX and E were compared. There was no effect of EX or E on BW and FI. Feeding higher WDDGS (30%) depressed performance, but an improved NR and AME was recorded. In Experiment 4, a small study was conducted to evaluate if wet feeding (WF; 1.2 mL water: 1.0 g feed) of diets with 30% wDDGS would impact turkey poult performance. The WF significantly improved BW, FI and FCR. It is apparent from these studies that high levels of WDDGS were not detrimental to overall performance. The high levels of wDDGS with no loss of production would result in a higher demand of wDDGS for use in turkey diets. Overall, we saw no improvements in performance with individual supplementation of protease, β-mannanase or an enzyme cocktail. Neither was extrusion of wDDGS beneficial. Voluntary feed consumption is improved when diets are wetted before feeding.

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A take-home milk supplementation programme consisting of 2 kg dry powdered milk offered monthly for 12 months to children 6--24 months of age in participating primary health care clinics was evaluated by assessing weight changes in supplemented and control children. Growth charts of supplemented (n = 362) and control (n = 410) children were summarized by the intercept and slope from the regression of individual weight measurements on age. The 2 groups were stratified by gender, ethnicity (Indo-Guyanese and Afro-Guyanese), and age intervals 0--6, 6--24, and 24--30 months which corresponded to pre, during, and post supplementation periods, respectively. Supplemented Indo-Guyanese girls gained significantly (p < 0.001) more weight than their controls: the difference being approximately 40 grams per month. No other differences were observed in the other gender/ethnic groups. Contextual information collected in a sub-sample of 60 mothers/caregivers of beneficiaries revealed that the supplement was mainly consumed with porridge, and tended to be shared more in the Afro-Guyanese than in Indo-Guyanese households. Over 90% of the beneficiaries were satisfied with the programme and wanted it to continue while 74% stated that it was of financial benefit. For future programmes, the use of locally produced infant cereal was recommended.

A study was conducted to examine the impact of diet and cold weather on the excretion of nitrogen (N) and phosphorus (P) from beef cows, and the potential for these nutrients to be lost to waterways or as greenhouse gases (GHG). Feces and urine were collected from mature cows fed low-quality forage supplemented with DDGS to 0%, 10%, and 20% ww-1 in the fall of 2008 and winter of 2009. A detailed nutrient analysis was performed to determine forms of N and fractions of P in excreta. Feces, urine, and a simulated bedding pack were then applied to grassland to determine soil GHG emission. Cattle receiving DDGS supplementation excreted greater proportions of labile P in feces and greater concentrations of P in urine. The 20% DDGS diets had greater nitrous oxide emission from urine patches and greater proportions of available N in urine and feces.

The objective of this thesis was to evaluate inclusion of up to 35% by-product DDGS (with reduced Ca and P) with and without addition of a proprietary premix (enzyme and antioxidant; Alltech Inc.) on productive performance and egg quality of white and brown egg laying hens. A total of 288 white or brown hens were randomly allocated to one of the following treatments: 1) corn-soybean meal (control), 2) 25% DDGS, 3) 25% DDGS plus premix, 4) 35% DDGS, and 5) 35% DDGS plus premix. Hen body weight values were impaired with addition of 25 and 35% DDGS when compared to the control. Premix helped maintain body weight comparable to control in the brown hens; however was not noted in white hens. In the second dietary phase, addition of DDGS increased feed intake in white egg laying hens and was maintained with the premix. Brown hens on premix came into lay faster than the control and DDGS diets, but DDGS reduced overall egg production. Haugh units, yolk color, and purchase intent scores were increased in brown eggs with DDGS diets. White eggs had increased yolk color with DDGS. In conclusion, up to 35% DDGS is acceptable in white laying hen diets.

The objective of this study was to determine the effect of nutrient density and housing on E. coli populations in beef and dairy production systems. In the first trial, sixty second trimester beef cows were housed in two different overwintering environments and provided dry hay which was either bale grazed or placed in a feed bunk. Selected pens had supplemented with dried distiller’s grain with soluble (DDGS; 2.5 kg/cow/every third day) or rolled barley (1 kg/cow/day). In the second trial, six rumen and caecal-cannulated, non-lactating, multiparous Holstein cows received one of the following diets: i) 70% forage ii) grain pellet or iii) alfalfa pellet. The latter two diets were formulated to induce subacute ruminal acidosis (SARA). All animals were randomly sorted to pens and treatments. Fecal samples were collected and cultured on selective media. E. coli were enumerated and three isolates were chosen for PCR to detect the presence of 18 selected genes encoding a range of virulence factors. These same isolates were tested for their ability to invade the human adenocarcinoma epithelial cell line HT-29. Diet did not significantly affect E. coli abundance but did influence the prevalence of virulence genes involved in adhesion of bacteria to epithelial surfaces. When the diet contained grain, cows shed isolates which were more invasive than those from cows in the other treatments. The data suggest that diet may affect the abundance of E. coli shed in the feces and increase the presence of E. coli harbouring particular virulence genes that mediate adhesion and invasion of epithelial surfaces.

The objective of this study was to determine the effect of nutrient density and housing on E. coli populations in beef and dairy production systems. In the first trial, sixty second trimester beef cows were housed in two different overwintering environments and provided dry hay which was either bale grazed or placed in a feed bunk. Selected pens had supplemented with dried distiller’s grain with soluble (DDGS; 2.5 kg/cow/every third day) or rolled barley (1 kg/cow/day). In the second trial, six rumen and caecal-cannulated, non-lactating, multiparous Holstein cows received one of the following diets: i) 70% forage ii) grain pellet or iii) alfalfa pellet. The latter two diets were formulated to induce subacute ruminal acidosis (SARA). All animals were randomly sorted to pens and treatments. Fecal samples were collected and cultured on selective media. E. coli were enumerated and three isolates were chosen for PCR to detect the presence of 18 selected genes encoding a range of virulence factors. These same isolates were tested for their ability to invade the human adenocarcinoma epithelial cell line HT-29. Diet did not significantly affect E. coli abundance but did influence the prevalence of virulence genes involved in adhesion of bacteria to epithelial surfaces. When the diet contained grain, cows shed isolates which were more invasive than those from cows in the other treatments. The data suggest that diet may affect the abundance of E. coli shed in the feces and increase the presence of E. coli harbouring particular virulence genes that mediate adhesion and invasion of epithelial surfaces.

Wheat distillers dried grain with solubles (DDGS) is a co-product of ethanol production, primarily utilized as an animal feed ingredient. Reduced protein quality, a highly energy-intensive drying process, and product variability are some of the challenges that currently confront its production in western Canada. The main focus of this research undertaking was to examine, on a laboratory-scale, the effect of condensed distillers solubles (CDS) : wet distillers grain (WDG) blending ratio and drying conditions on the protein quality and physico-chemical characteristics of wheat DDGS. The potential of microwave-based drying methods in minimizing protein damage and energy consumption was investigated. An auxiliary case study was also conducted in the Philippines to apply the knowledge and skills acquired from the PhD research undertaking to a related problem situation in a developing country. It aimed to provide more information about brewers spent grain (BSG) supply and utilization in Misamis Oriental, Philippines and enhanced the efficiency and safety of BSG utilization as an animal feed ingredient. Laboratory-scale investigations used samples produced at three CDS:WDG blending ratios (by mass): 15:85 (15% CDS), 30:70 (30% CDS), and 45:55 (45% CDS) and dried under forced air convection (40-120C), and under microwave (420 – 805 W) and microwave convection (nominal settings of 130C-30% power to 190C-30% power) methods using a domestic microwave oven. Freeze-dried samples were used as standards in evaluating chemical composition and color of wheat DDGS. As CDS level in the blend was increased, protein and ash content of freeze-dried samples increased while fat, acid detergent fiber (ADF) and neutral detergent fiber (NDF) content decreased. These trends were attributed to proximate composition differences between CDS and WDG fractions. The CDS fraction had higher protein and ash and lower fat, ADF, and NDF contents compared to WDG. Variation in the CDS:WDG blending ratio employed in the source ethanol plant could be one of the factors contributing to the observed proximate composition differences between two ethanol plant-sourced wheat DDGS samples. This was verified through proximate analyses of: (i) plant-sourced wheat DDGS samples from two production batches; (ii) CDS and WDG samples obtained on the same production date; and (iii) laboratory-produced wheat DDGS samples at varying CDS:WDG blending ratios. Protein, ash, and NDF contents of forced-air convection-, microwave-, and microwave convection-dried samples also showed strong linear relationships with CDS level. Fat and ADF content, however, did not exhibit similar strong relationships with CDS level, indicating the influence of drying conditions. Maximum lysine and minimum acid detergent insoluble crude protein (ADICP) contents were achieved in blends with the highest CDS level (45% CDS) and dried under lower drying temperature (80C), microwave power (676 W), and microwave convection (150C-30% power) settings. Microwave- and microwave convection drying achieved desirable protein quality associated with lower temperature drying under much shorter times. Laboratory-scale drying of ethanol plant-sourced wet distillers grain with solubles (WDGS) under forced air convection produced DDGS samples with decreased lysine content as drying air temperature was increased. In terms of physical properties, dried samples with higher CDS level were significantly finer, denser, less flowable, less dispersible, have lower thermal diffusivity and higher internal friction coefficients, and produced denser and stronger pellets. Color parameters of freeze-dried samples were significantly affected by CDS level. As CDS level increased, lightness (Hunter L) decreased while redness (Hunter a) increased. The color parameters of forced-air convection-, microwave-, and microwave convection-dried DDGS samples did not, however, exhibit similar linear trends with CDS level as these were also affected by drying conditions, such as drying air temperature and microwave power level. Effective moisture diffusivity values, estimated from the drying data, were also significantly affected by drying conditions (drying air temperature and microwave power levels), CDS level, and interaction between drying air temperature and CDS level. Effective moisture diffusivity decreased as CDS level was increased. Physical properties of two commercial (ethanol plant-sourced) wheat DDGS samples, as affected by moisture content, were also assessed. Techno-economic evaluation results indicated that complete replacement of the conventional hot air drying with microwave drying technology was not yet economically feasible. Although energy consumption during drying was substantially reduced with the use of microwave energy, the cost of electricity to generate microwave energy was high. Incorporating microwave drying toward the end of the hot air drying process was seen as the more economically viable alternative. Drying of BSG was not commonly practiced in Misamis Oriental, Philippines. The material was typically stored in open concrete bins and commonly fed to dairy cattle in its wet form. A prototype batch dryer, powered either by solar or biomass energy, was developed to improve shelf life and safe use of BSG. Initial tests showed that drying spent grain using a biomass furnace was feasible. Operating the dryer using solar energy was not an attractive option because of the long drying time. Basic physical attributes, proximate composition, and moisture sorption characteristics of the dried BSG were also determined. Practical implications of the results of these two studies to their respective local contexts were discussed. Recommendations to further improve understanding of wheat DDGS protein quality and physico-chemical characteristics, BSG dryer performance, backyard farmers’ sustainable access and safe use of BSG were also presented.