D-Index & Metrics Best Publications

D-Index & Metrics

Discipline name D-index D-index (Discipline H-index) only includes papers and citation values for an examined discipline in contrast to General H-index which accounts for publications across all disciplines. Citations Publications World Ranking National Ranking
Animal Science and Veterinary D-index 24 Citations 2,434 53 World Ranking 1133 National Ranking 21

Overview

What is he best known for?

The fields of study he is best known for:

  • Biochemistry
  • Food science
  • Animal science

J.J. Callan mainly investigates Animal science, Food science, Dry matter, Fatty acid and Urine. J.J. Callan interconnects Forage, Inulin, Lactose and Coconut oil in the investigation of issues within Animal science. In the field of Food science, his study on Organoleptic overlaps with subjects such as Lactation.

In Dry matter, J.J. Callan works on issues like Pasture, which are connected to Urea and Low protein. The study incorporates disciplines such as Caecum, Ileum and Jejunum in addition to Fatty acid. J.J. Callan has included themes like Feces, Ammonia, Manure, Excretion and Metabolism in his Urine study.

His most cited work include:

  • Effect of forage/concentrate ratio and dietary coconut oil level on methane output and performance of finishing beef heifers (140 citations)
  • The effects of seaweed extract inclusion on gut morphology, selected intestinal microbiota, nutrient digestibility, volatile fatty acid concentrations and the immune status of the weaned pig. (96 citations)
  • Effect of refined coconut oil or copra meal on methane output and on intake and performance of beef heifers. (89 citations)

What are the main themes of his work throughout his whole career to date?

His primary areas of study are Animal science, Food science, Dry matter, Excretion and Manure. His Animal science research is multidisciplinary, relying on both Meal, Lactose, Agronomy and Fatty acid. His biological study spans a wide range of topics, including Phosphorus, Phytase and Feces.

He combines subjects such as Dairy cattle and Pasture with his study of Dry matter. His Excretion study combines topics from a wide range of disciplines, such as Urine, Nutrient and Nitrogen balance. His research integrates issues of Fermentation, Beta-glucan, Ammonia and Odor in his study of Manure.

He most often published in these fields:

  • Animal science (64.38%)
  • Food science (42.47%)
  • Dry matter (23.29%)

What were the highlights of his more recent work (between 2008-2013)?

  • Food science (42.47%)
  • Animal science (64.38%)
  • Manure (21.92%)

In recent papers he was focusing on the following fields of study:

J.J. Callan spends much of his time researching Food science, Animal science, Manure, Phosphorus and Feces. The concepts of his Food science study are interwoven with issues in Dairy cattle and Microbiology. J.J. Callan is interested in Dry matter, which is a field of Animal science.

His Manure research incorporates themes from Fermentation, Beta-glucan, Ammonia, Odor and Excretion. J.J. Callan focuses mostly in the field of Phosphorus, narrowing it down to topics relating to Calcium metabolism and, in certain cases, Inulin and Nitrogen phosphorus. While the research belongs to areas of Feces, J.J. Callan spends his time largely on the problem of Urine, intersecting his research to questions surrounding Veterinary medicine.

Between 2008 and 2013, his most popular works were:

  • A comparison between Holstein-Friesian and Jersey dairy cows and their F1 hybrid on milk fatty acid composition under grazing conditions (58 citations)
  • Effect of DL-malic acid supplementation on feed intake, methane emission, and rumen fermentation in beef cattle (50 citations)
  • Effect of β-glucans contained in barley- and oat-based diets and exogenous enzyme supplementation on gastrointestinal fermentation of finisher pigs and subsequent manure odor and ammonia emissions (37 citations)

In his most recent research, the most cited papers focused on:

  • Biochemistry
  • Animal science
  • Enzyme

J.J. Callan focuses on Animal science, Manure, Dry matter, Food science and Fermentation. His Animal science study integrates concerns from other disciplines, such as Phosphorus, Phytase and Acclimatization. His Manure study incorporates themes from Excretion and Ammonia.

J.J. Callan has researched Dry matter in several fields, including Feces, Veterinary medicine, Urine, Feed conversion ratio and Nutrient. As part of one scientific family, J.J. Callan deals mainly with the area of Food science, narrowing it down to issues related to the Dairy cattle, and often Linoleic acid, Pasture, Weight gain, Milking and Grazing. His work carried out in the field of Fermentation brings together such families of science as Cattle feeding, Butyric acid and Odor.

This overview was generated by a machine learning system which analysed the scientist’s body of work. If you have any feedback, you can contact us here.

Best Publications

Effect of forage/concentrate ratio and dietary coconut oil level on methane output and performance of finishing beef heifers

D. Lovett;S. Lovell;L. Stack;J. Callan.
Livestock Production Science (2003)

202 Citations

Effect of refined coconut oil or copra meal on methane output and on intake and performance of beef heifers.

E. Jordan;D. K. Lovett;F. J. Monahan;J. Callan.
Journal of Animal Science (2006)

164 Citations

The effects of seaweed extract inclusion on gut morphology, selected intestinal microbiota, nutrient digestibility, volatile fatty acid concentrations and the immune status of the weaned pig.

P. Reilly;J. V. O’Doherty;K. M. Pierce;J. J. Callan.
Animal (2008)

145 Citations

The effect of cereal type and exogenous enzyme supplementation in pig diets on nutrient digestibility, intestinal microflora, volatile fatty acid concentration and manure ammonia emissions from finisher pigs

J.M. O'Connell;T. Sweeney;J. J. Callan;J. V. O'Doherty.
Animal Science (2005)

115 Citations

Manipulating enteric methane emissions and animal performance of late-lactation dairy cows through concentrate supplementation at pasture.

D.K. Lovett;L.J. Stack;S. Lovell;J. Callan.
Journal of Dairy Science (2005)

113 Citations

The effect of lactose and inulin on intestinal morphology, selected microbial populations and volatile fatty acid concentrations in the gastro-intestinal tract of the weanling pig

K. M. Pierce;T. Sweeney;P. O. Brophy;J. J. Callan.
Animal Science (2006)

105 Citations

Supplementary concentrate type affects nitrogen excretion of grazing dairy cows.

F.J. Mulligan;P. Dillon;J.J. Callan;M. Rath.
Journal of Dairy Science (2004)

105 Citations

Effect of DL-malic acid supplementation on feed intake, methane emission, and rumen fermentation in beef cattle

P.A. Foley;D.A. Kenny;J.J. Callan;T.M. Boland.
Journal of Animal Science (2009)

101 Citations

The effect of dietary garlic and rosemary on grower-finisher pig performance and sensory characteristics of pork

S.P. Cullen;Frank J Monahan;J.J. Callan;John V. O'Doherty.
Irish Journal of Agricultural and Food Research (2005)

99 Citations

A comparison between Holstein-Friesian and Jersey dairy cows and their F1 hybrid on milk fatty acid composition under grazing conditions

R.A. Palladino;F. Buckley;R. Prendiville;J.J. Murphy.
Journal of Dairy Science (2010)

87 Citations

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Profile was last updated on December 6th, 2021.
Research.com Ranking is based on data retrieved from the Microsoft Academic Graph (MAG).
The ranking d-index is inferred from publications deemed to belong to the considered discipline.

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