D. A. Roland

D. A. Roland publication distribution in Animal Science and Veterinary in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Animal Science and Veterinary in 2026. The highlighted bar marks where D. A. Roland sits on this spectrum.

D. A. Roland D-index placement in Animal Science and Veterinary in 2026

The chart shows the D-index (discipline H-index) distribution of Animal Science and Veterinary scientists ranked by Research.com in 2026. The highlighted bar marks where D. A. Roland sits on this spectrum.

Best Publications

• Performance of commercial laying hens fed various phosphorus levels, with and without supplemental phytase

  RW Gordon;DA Roland

  196
  Citations

• Effect of dietary energy on performance and egg composition of Bovans White and Dekalb White hens during phase I

  G. Wu;M. M. Bryant;R. A. Voitle;D. A. Roland

  154
  Citations

• Influence of large doses of ascorbic acid on performance, plasma calcium, bone characteristics, and eggshell quality in broilers and Leghorn hens.

  J. I. Orban;D. A. Roland;K. Cummins;R. T. Lovell

  112
  Citations

• Influence of supplemental microbial phytase on first cycle laying hens fed phosphorus-deficient diets from day one of age

  S Punna;DA Roland

  88
  Citations

• Influence of Dietary Phosphorus on Performance of Hy-Line W36 Hens

  S. S. Sohail;D. A. Roland

  81
  Citations

• The Influence of Various Calcium and Phosphoras Levels on Tibia Strength and Eggshell Quality of Pullets During Peak Production

  T. J. Frost;D. A. Roland

  78
  Citations

• Influence of Calcium and Environmental Temperature on Performance of First-Cycle (Phase 1) Commercial Leghorns

  D. A. Roland;M. M. Bryant;H. W. Rabon;J. Self

  78
  Citations

• The Ability of Hens to Maintain Calcium Deposition in the Egg Shell and Egg Yolk as the Hen Ages

  D. A. Roland;D. R. Sloan;R. H. Harms

  74
  Citations

• Influence of Vitamin D3, 1α-Hydroxyvitamin D3, and 1,25-Dihydroxyvitamin D3 on Eggshell Quality, Tibia Strength, and Various Production Parameters in Commercial Laying Hens

  T. J. Frost;D. A. Roland;G. G. Untawale

  72
  Citations

• Influence of Premolt Production on Postmolt Performance with Explanation for Improvement in Egg Production Due to Force Molting

  D. A. Roland;J. Brake

  71
  Citations

• Factors Influencing Bone Mineral Content, Density, Breaking Strength, and Ash as Response Criteria for Assessing Bone Quality in Chickens

  J. I. Orban;D. A. Roland;M. M. Bryant;J. C. Williams

  69
  Citations

• Influence of Dietary Calcium Level and Particle Size of Calcium Source on In Vivo Calcium Solubilization by Commercial Leghorns

  K. S. Rao;D. A. Roland

  68
  Citations

• Influence of Dietary Fat on Economic Returns of Commercial Leghorns

  S. S. Sohail;M. M. Bryant;D. A. Roland

  66
  Citations

• In Vivo Limestone Solubilization in Commercial Leghorns: Role of Dietary Calcium Level, Limestone Particle Size, In Vitro Limestone Solubility Rate, and the Calcium Status of the Hen

  K. S. Rao;D. A. Roland

  65
  Citations

• Calcium and its Relationship to Excess Feed Consumption, Body Weight, Egg Size, Fat Deposition, Shell Quality, and Fatty Liver Hemorrhagic Syndrome,

  D. A. Roland;M. Farmer;D. Marple

  64
  Citations

• Shell quality as influenced by zeolite with high ion-exchange capability.

  Unknown

  55
  Citations

• Effect of essential fatty acid deficiency and type of dietary fat supplementation on biotin-deficient chicks.

  David A. Roland;Hardy M. Edwards

  51
  Citations

• The Ability of Hens to Regulate Protein Intake When Offered A Choice of Diets Containing Different Levels of Protein

  Unknown

  47
  Citations

• The Effects of Various Dietary Phosphorus Levels on the Circadian Patterns of Plasma 1,25-Dihydroxycholecalciferol, Total Calcium, Ionized Calcium, and Phosphorus in Laying Hens

  T. J. Frost;D. A. Roland;D. N. Marple

  34
  Citations

• Research note: current methods used in determination and evaluation of tibia strength: a correlation study involving birds fed various levels of cholecalciferol.

  T. J. Frost;D. A. Roland

  29
  Citations

• Calcium Metabolism in Broiler Breeder Hens. 2. The Influence of the Time of Feeding on Calcium Status of the Digestive System and Eggshell Quality in Broiler Breeders

  M. Farmer;D. A. Roland;M. K. Eckman

  28
  Citations

• Influence of dietary calcium on bone calcium utilization

  M. Farmer;D. A. Roland;A. J. Clark

  27
  Citations

• Evidence for Absorption of Silicon and Aluminum by Hens Fed Sodium Zeolite A

  D. A. Roland;H. W. Rabon;K. S. Rao;R. C. Smith

  19
  Citations

• Calcium Metabolism in Broiler Breeder Hens: 1. Calcium Status of the Digestive Tract of Broiler Breeders Throughout a 24-Hour Period

  M. Farmer;D. A. Roland;J. Brake;M. K. Eckman

  19
  Citations