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 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.
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.
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.
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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)
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)
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.
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)
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)
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)
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)
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)
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)
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)
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