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Articles by Zurong Wang
Total Records ( 2 ) for Zurong Wang
  Zurong Wang , Sandro Cerrate , Cesar Coto , Fenglan Yan and P.W. Waldroup
  This study was conducted to evaluate the bioavailability of an organic copper source, MINTREX® Cu, compared with reagent grade Cu sulfate as a source of Cu in broiler diets. Nutritionally complete basal diets were supplemented with either copper sulfate or MINTREX Cu to provide diets with 0, 10, 25, 50, 125, 250 and 500 mg kg-1 of supplemental Cu. Fifty commercial broiler strain (Cobb 500) male chicks were placed in each of 48 pens. Each diet (except for 500 mg kg-1) was fed to four replicate pens. The 500 mg kg-1 level was fed to two replicate pens for each source. There were two feeding phases including starter (0-21 d) and grower (21-35 d). At the end of each phase, birds were weighed by pens and two birds per pen (four birds per pen for the 500 mg kg-1 levels) were killed to take liver and tibia samples for analysis of Cu concentration. Overall, there was no effect of Cu source or dietary Cu concentration on feed conversion or mortality. At 14 d the birds in the MINTREX treatment weighed significantly more than the birds in the Cu sulfate treatment. High Cu concentrations markedly decreased (p<0.0001) body weight regardless of Cu sources in both phases. Elevated dietary Cu concentration significantly increased (p<0.01) tibia ash Cu concentration for both Cu sources in both phases; however there was no good linear relationship between tibia Cu accumulation and non-zero Cu consumption. There were marked effects (p<0.05) of Cu source, concentration and their interaction on 14 d dry liver Cu concentration. Based on dry liver Cu concentration regressed on non-zero copper consumption, the relative bioavailability of MINTREX Cu was 111.63% for 14 d and 110.71% for 35 d when bioavailability of reagent grade Cu sulfate was set as 100%. This indicated that MINTREX Cu source has greater biological availability than reagent grade Cu sulfate for broilers.
  Zurong Wang , Sandro Cerrate , Cesar Coto , Frances Yan and Park W. Waldroup
  A study was conducted to evaluate the use of constant or increasing levels of Distillers Dried Grains with Solubles (DDGS) in diets for broilers. Diets were formulated for starter (0-14 d), grower (14 to 35 d) and finisher (35 to 42 d) periods to contain 0, 15, or 30% DDGS. Diets were formulated on digestible amino acid basis to meet current U.S. poultry industry nutrient levels and were maintained isocaloric and isonitrogenous. Varying levels of DDGS were fed during the study; with some birds receiving a constant level while others received increasing amounts as the bird aged. The DDGS levels used in the study were as follows (starter-grower-finisher, %): 1) 0-0-0; 2) 0-15-15; 3) 0-15-30; 4) 0-30-30; 5) 15-15-15; 6) 15-15-30; 7) 15-30-30; 8) 30-30-30. Starter diets were crumbled, while grower and finisher diets were pelleted. Each of the dietary treatments was fed to four replicate pens of 25 birds each. Body weights and feed consumption were determined at 14, 35 and 42 d of age. At the conclusion of the study five representative birds were processed for dressing percentage and parts yield. The results indicated that increasing DDGS levels had a trend to reduce the weight:volume ratio and visually decreased pellet quality. Diets containing 15% DDGS could be fed throughout the entire feeding period of 1 to 42 d of age with no adverse effects on live performance or carcass composition when diets were formulated on a digestible amino acid basis. Inclusion of 30% DDGS in the diet reduced the weight:volume ratio and markedly reduced pellet quality. Birds fed diets with 30% DDGS during the starter or grower periods had reduced body weight, elevated feed conversion and typically had reduced breast meat yield, compared to birds fed diets with 15% DDGS or birds fed the control diet with no DDGS. Feeding DDGS for the last seven days prior to slaughter after being fed diets with 15% during starter or grower period might possibly be acceptable in terms of body weight gain and feed conversion but still resulted in a significant reduction in breast meat yield. It is possible that some of the essential amino acids that were not considered in the formulation of the diets may become marginal or deficient in diets with 30% DDGS. Further studies are suggested to evaluate needs for these amino acids in diets with high levels of DDGS.
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