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Articles by P. W. Waldroup
Total Records ( 2 ) for P. W. Waldroup
  S. Cerrate , Z. Wang , C. Coto , F. Yan and P. W. Waldroup
  Chickens from two broiler strains known to differ in growth rate and feed conversion (GROWTH) and in high breast meat yield (YIELD) were grown to 10 days of age on a common starter diet and from 11 to 49 days were provided single diets (control), a choice between high energy and high protein diets, or a choice between starter and finisher diets. Overall the YIELD strain had greater body weight, feed intake and breast yield than did GROWTH strain. However, the YIELD strain had better feed conversion only when offered a choice of starter and finisher diets. Birds fed single diets and Starter-Finisher diets had better body weight, feed intake, feed conversion and breast yield than those birds fed Energy-Protein diets. Birds fed both choice feeding systems selected more high energy diets than high protein diets especially during the period of 11 to 22 d of age. The YIELD strain had a preference for the high protein diet and consequently had greater protein intake and average dietary protein content than did the GROWTH strain, while the former ate more energy intake but less energy content than did the latter. Birds given choice of the energy and protein diets had less protein intake and content for all periods, whereas these birds chose less energy intake for the period of 22 to 42 d of age and a higher energy level than did birds fed the other two feeding systems. These data indicate that choice feeding systems can identify differences in performance according to the selected nutritional needs for new strains of broilers.
  Z. Wang , S. Cerrate , C. Coto , F. Yan and P. W. Waldroup
  This study was conducted to evaluate the use of moderate to high levels of DDGS in broiler diets and to evaluate the effects of rapid and multiple changes in level of DDGS during the growth period. Diets were formulated to contain 0, 15, or 30% DDGS with diets formulated on the basis of digestible amino acids to meet levels typical of the U.S. broiler industry. Groups of birds were fed diets with these three levels of DDGS on a constant basis from 0 to 42 d of age. Other groups were fed 0 and 15% or 0 and 30% DDGS on alternate week basis, with one group starting with diets containing no DDGS and other groups starting with diets containing 15 or 30% DDGS. Four pens of 25 male broilers were fed each of the dietary treatments. At the conclusion of the study five representative birds per treatment were processed to determine dressing percentage and carcass yield. Birds fed diets containing 15% did not differ significantly in live performance or carcass characteristics from birds fed diets with no DDGS, whether fed on a continuous basis or alternated weekly between 0 and 15% DDGS. Birds that were continuously fed diets with 30% DDGS had significantly reduced body weight and feed intake at 35 and 42 d compared to birds fed the control diet with no DDGS and had reduced breast meat yield. When birds were fed diets with 0 or 30% DDGS alternating on a weekly basis live performance was approximately midway between that of birds fed diets with 0 or 30% continuously and similar to that of birds fed 15% DDGS on a constant basis, but breast meat yield tended to be reduced. The results of the study demonstrated the effective use of diets with 15% DDGS when formulated on a digestible amino acid basis and showed that abrupt removal of this level of DDGS did not adversely affect performance of broilers. Further studies are suggested to quantify reasons for reduced performance when fed diets containing 30% DDGS.
 
 
 
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