J.J. Callan

Overview

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

  247
  Citations

• The effect of dietary Laminaria‐derived laminarin and fucoidan on nutrient digestibility, nitrogen utilisation, intestinal microflora and volatile fatty acid concentration in pigs

  Mary B Lynch;Torres Sweeney;James J Callan;John T O'Sullivan

  188
  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

  188
  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

  186
  Citations

• The effects of lactose inclusion and seaweed extract derived from Laminaria spp. on performance, digestibility of diet components and microbial populations in newly weaned pigs

  J.V. O’Doherty;S. Dillon;S. Figat;J.J. Callan

  147
  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

  142
  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

  130
  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

  127
  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

  124
  Citations

• Supplementary concentrate type affects nitrogen excretion of grazing dairy cows.

  F.J. Mulligan;P. Dillon;J.J. Callan;M. Rath

  121
  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

  116
  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

  108
  Citations

• Performance of weanling piglets offered low-, medium- or high-lactose diets supplemented with a seaweed extract from Laminaria spp.

  D. A. Gahan;M. B. Lynch;J. J. Callan;J. T. O’Sullivan

  96
  Citations

• The effect of dietary crude protein level, cereal type and exogenous enzyme supplementation on nutrient digestibility, nitrogen excretion, faecal volatile fatty acid concentration and ammonia emissions from pigs

  J.M. O’Connell;J.J. Callan;J.V. O’Doherty

  90
  Citations

• The interaction between lactose level and crude protein concentration on piglet post-weaning performance, nitrogen metabolism, selected faecal microbial populations and faecal volatile fatty acid concentrations

  K.M. Pierce;J.J. Callan;P. McCarthy;J.V. O’Doherty

  88
  Citations

• The influence of manure composition on emissions of odour and ammonia from finishing pigs fed different concentrations of dietary crude protein

  Aidan B.G. Leek;Enda T. Hayes;Thomas P. Curran;James J. Callan

  87
  Citations

• Performance of weanling pigs offered low or high lactose diets supplemented with avilamycin or inulin

  K. M. Pierce;J. J. Callan;P. McCarthy;J. V. O'Doherty

  81
  Citations

• Effects of increasing the intake of dietary β-glucans by exchanging wheat for barley on nutrient digestibility, nitrogen excretion, intestinal microflora, volatile fatty acid concentration and manure ammonia emissions in finishing pigs

  M. B. Lynch;T. Sweeney;J. J. Callan;J. V. O’Doherty

  78
  Citations

• Effect of crude protein concentration and sugar-beet pulp on nutrient digestibility, nitrogen excretion, intestinal fermentation and manure ammonia and odour emissions from finisher pigs.

  M. B. Lynch;C. J. O’Shea;T. Sweeney;J. J. Callan

  76
  Citations

• The effect of varying levels of coconut oil on intake, digestibility and methane output from continental cross beef heifers

  E. Jordan;D. K. Lovett;M. Hawkins;J. J. Callan

  76
  Citations

• Effect of phytase inclusion and calcium/phosphorus ratio on the performance and nutrient retention of grower–finisher pigs fed barley/wheat/soya bean meal-based diets

  S M Brady;J J Callan;D Cowan;M McGrane

  69
  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

  C. J. O’Shea;T. Sweeney;M. B. Lynch;D. A. Gahan

  65
  Citations

• The effect of inclusion of a high lactose supplement in finishing diets on nutrient digestibility, nitrogen excretion, volatile fatty acid concentrations and ammonia emission from boars

  K.M. Pierce;T. Sweeney;J.J. Callan;C. Byrne

  58
  Citations

• In vitro fermentation patterns and methane production as influenced by cultivar and season of harvest of Lolium perenne L.

  D. K. Lovett;D. McGilloway;A. Bortolozzo;M. Hawkins

  52
  Citations