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Occupation: Other
BTechnol(Hons), MSc, PhD. Associate Professor of Poultry Nutrition and Director of the Poultry Research Foundation within the Veterinary Science Faculty, University of Sidney, Australia. Dr Aaron Cowieson is an enthusiastic monogastric nutritionist, specializing in digestive physiology and feed additive biochemistry. Aaron has published over 150 articles, including more than 40 in international peer-reviewed journals.
Location: Orkney, United Kingdom
This member gave a presentation on February 11, 2026
At the following event:
37th Annual Australian Poultry Science Symposium
Aaron Cowieson likes the comment:
Dear Aaron, be in touch with it is a pleasure for me, as well. Sorry not knowing the 5 to 6 years work of DSM. Congratulation! For sure, in the future, all the data collected will make assumption more precise. I strongly believe on that!
Participation in Forum on February 4, 2026
@Antônio Mário Penz Junior I fully agree with you. Unfortunately, most published studies in livestock only contain small cohorts of animals and this makes the reference ranges quite unreliable (for now). There are also quite a variety of analytical approaches to measuring haematological features which doesnt help make meta-analysis easy! In human medicine this is very well standardised. What we ha ...
Aaron Cowieson likes the comment:
Dear Aaron! This variability is big in humans, as well. However, based on million of analysis, the doctors can suspect or confirm health condition based on minimum and/or maximum figures. If someone starts collecting published data on chicken blood parameters, we will be able, eventually, to predict future diseases, as it is predicted in human health. Our comments can motivate some of our universi ...
Participation in Forum on February 3, 2026
@Antônio Mário Penz Junior in DSM, I have been working for the past 5-6 years on exactly this topic, and the results are fascinating. Blood composition tells us an enormous amount about the health, welfare, and nutritional state of the bird. We see surprising amounts of variance, even in plasma analytes such as calcium or sodium, where regulatory mechanisms are quite sophisticated. We ...
Article published the October 14, 2025
I. INTRODUCTIONThe laying hen has a considerable requirement for dietary calcium (Ca) and phosphorus (P) to support optimum egg production, egg quality and other physiological processes. In particular, a high intake of Ca ranging from 4 to 4.5% of the diet is considered important as the laying cycle progresses from early to late lay to achieve optimum egg number and egg shell quality. A capacity f ...
News published on September 23, 2025
The 37th Annual Australian Poultry Science Symposium will take place from February 9th to 11th, 2026.
Planning is coming along nicely for APSS2026, and we have nine excellent invited speakers who are all very excited to be involved in the symposium next February.
CONFIRMED INVITED SPEAKERS:
Richard Ducatelle - Ghent University, Belgium
Tina Widowski - University of ...
Article published the July 16, 2025
I. INTRODUCTIONExogenous feed enzymes were first introduced as commercially-relevant feed additives in the 1980s with an initial focus on reduction of the antinutritional effects of high molecular weight soluble pentosans in wheat- and barley-based diets for young broiler chickens (Bedford & Partridge, 2010). Exogenous phytase was launched in the early 1990s to increase the digestibility of or ...
Article published the June 14, 2024
An increase in dietary phytate concentration may limit the availability of both phosphorus (P) and calcium (Ca) as a result of the progressive formation of Ca-phytate complexes along the gastrointestinal tract (Selle et al., 2009). However, inconsistent results were reported regarding the impact of phytate on P and Ca release in the presence of phytase with broilers, presumably due to the differen ...
Article published the January 12, 2024
I. INTRODUCTIONStephen Jay Gould famously introduced the term ‘non-overlapping magisteria’ in a Natural History article in March 1997, to describe the separation between scientific and religious lines of enquiry (Gould, 1997). From a broiler nutrition perspective, it would be accurate to represent digestible amino acid and metabolisable energy research, and digestible P and Ca research ...