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Articles by J.T. Lee
Total Records ( 4 ) for J.T. Lee
  M.P. Williams , C. Coufal , E. Caraway , R. Carpenter and J.T. Lee
  Two experiments were conducted to evaluate the effectiveness of two fermented rice/soy products (A and B) on fecal odor compound volatilization and performance parameters when included in broiler diets. In Experiment 1 the addition of fermentate B at 900 g/ton increased (p<0.05) d 21 body weight. The inclusion of both fermentates resulted in significant decreases (p<0.05) in multiple volatile organic compounds which are associated with odor related to poultry. In Experiment 2, the addition of fermentate B at 900 g/ton resulted in a significant increase (p<0.05) in d 14 body weight. Inclusion of both rice/soy fermentates (A and B) significantly increased (p<0.05) carcass weights. Additionally, significant reductions (p<0.05) were observed on d 21 and 42 fecal pH with both fermentates (A and B). Taken in totality, these data demonstrate the ability of a rice/soy fermentate to alter the intestinal environment by reduced digest pH, reduced odorant volatilization and increased early bird weight.
  J. Pieniazek , M.P. Williams , R. Latham , H. Walters , T.A. Wickersham , R. Levine , J. Lebrun , D. Caldwell and J.T. Lee
  The objective of the current study was to investigate the effects of an algal β-1,3-glucan (ABG) product on broiler performance, oocyst output following an Eimeria challenge and antibody titer levels following a Newcastle Disease vaccination program. Three experiments were conducted evaluating four dietary treatments: a control diet and three levels of ABG (100, 250 and 750 g/MT). Experiment 1 evaluated the effects of ABG on performance parameters and relative organ weight in a 42 d grow-out study. Ten replicates per treatment each contained 35 live-oocyst vaccinated broilers. Inclusion of ABG at 750 g/MT increased d 14 BW compared to the control while inclusion of ABG at 250 g/MT improved feed conversion ratio (FCR) compared to the control diet during the starter phase of production. At the conclusion of the trial, no differences in BW, FCR, or relative organ weights were observed. Experiment 2 consisted of 70 broilers per dietary treatment placed in battery pens and challenged with a 100 x dose of vaccine strain Eimeria oocysts on d 10. Fecal samples were collected on 6, 7, 8 and 9 d post inoculation to determine oocyst output. Inclusion of ABG at 100 and 250 g/MT numerically reduced oocyst/g of fecal material on d 6 post-challenge compared to the control. The inclusion of ABG at 250 and 750 g/MT reduced cumulative FCR through d 20 compared to the challenged control broilers. Experiment 3 consisted of 120 male broilers with 5 birds randomly placed in each of 6 replicate battery pens per treatment. Newcastle vaccine was administered on d 1 of age and a boost was administered on d 18 of age. Blood samples were collected 7 d post boost to evaluate Newcastle specific antibody titers. Greater antibody titers were observed on d 25 in birds fed ABG at 250 g/MT compared to the control group. Combined, these data demonstrate the ability of ABG to stimulate broiler immune response and improve early broiler performance during coccidial vaccine challenge.
  A. Jasek , X. Li , H. Xu , R.M. Raab , J.N. Broomhead and J.T. Lee
  Background and Objectives: An experiment (phase 1) was conducted to evaluate the retained activity of a maize-derived, recombinant carbohydrase enzyme (AC1) when exposed to heat during the pelleting process and homogeneity when mixed into mash diet. A second experiment (phase 2) was conducted to evaluate the effects of increasing AC1 concentrations on male broiler growth performance and ileal nutrient digestibility. Materials and Methods: A total of 728 broilers were randomly assigned to seven dietary treatments with each treatment consisting of 13 replicates with eight Cobb 500 male broilers. The experimental design included a positive control (PC), a reduced energy negative control (NC, comprising the PC less 132 kcal kg1) diet and five additional treatments with increasing dose of AC1 (5, 50, 100, 250 and 500 U glucanase kg1) added to the NC diet. Birds were fed a starter ration for the duration of the study (16 d). Average body weight (BW), mortality adjusted feed conversion ratio (FCR) and feed consumption (FC) were determined on 16 d of age. At the conclusion of the experiment, all birds from each replicate pen were necropsied and ileal contents pooled within replicate to determine ileal digestibility of energy (IDE) and nitrogen (IDN). Results: In Phase 1, the recovery of ß-glucanase activity in the pellets (in relation to mash feed) were 111, 83 and 82% when pelleted at 80, 85 and 90°C, respectively. The coefficient of variation of glucanase recovered when AC1 was mixed into feed and was less than 10%. In Phase 2, the inclusion of AC1 at 100 and 250 U glucanase kg1 increased (p<0.01) BW compared to both the PC and NC fed broilers. This elevation in BW was related to an increase (p<0.01) in FC. As expected, reducing energy in the NC diet decreased (p<0.01) IDE value of the feed as compared to the PC diet. The addition of AC1 to supply ≥100 U glucanase kg1 increased (p<0.01) IDE compared to the NC diet and restored IDE equivalent (p>0.05) to the PC diet. Regression analysis confirmed linear and quadratic increases in IDE and IDN with the addition of AC1. Conclusion: These data demonstrate the thermal stability of maize-derived, recombinant AC1 and that increasing levels positively influences nutrient digestibility leading to significant improvements in broiler performance.
  H.G. Walters , M.P. Williams , R. Latham , N. Augspurger , B. Brown and J.T. Lee
  Background and Objective: The objective of the current study was to evaluate the performance of broilers fed reduced-energy diets with the inclusion of nonstarch polysaccharide-degrading enzyme (NSPase). Materials and Methods: Three separate performance trials were conducted, with two of these trials evaluating processing yields in addition to growth performance. Each experimental design consisted of three dietary treatments including a positive control (PC), negative control (NC) with a 132 kcal kg1 AME reduction throughout the experiments when compared to the PC and the NC supplemented with NSPase (NC+NSPase). All diets were corn and soybean meal based and contained distillers dried grains with solubles (DDGS). Experiments 1 and 3 consisted of 3 dietary phases including a starter (days 1-14), grower (days 15-28) and finisher (days 29-42) phase. Experiment 2 consisted of 4 dietary phases including a starter (days 1-14), grower (days 15-28), finisher (days 29-35) and withdrawal (days 36-42) phase. All experiments consisted of 10 replicates per treatment. At the conclusion of experiments 1 and 2, 6 broilers from each replicate were processed for carcass weight without giblets (WOG), fat pad and yield measurements on day 43. Results: In all experiments, the inclusion of NSPase increased body weight and improved feed conversion ratio (FCR) while also improving processing yields in experiments 1 and 2. In these trials, the NC diet yielded the lowest processing yields, while the inclusion of NSPase increased (p<0.05) multiple processing parameters when compared to the low-energy diet. Conclusion: These data confirm the ability of NSPase inclusion to improve performance and processing parameters in reduced-energy diets.
 
 
 
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