Bryden, W.L.

The effect of probiotics on animal performance is not consistent and may be impacted by multiple factors, such as dose, route of administration, disease stress, and management. We have previously examined the efficacy of the probiotic Bacillus amyloliquefaciens strain H57 (H57) in a disease stress model with subclinical necrotic enteritis (NE) (Shini et al., 2020); in the study only one dose of H5 ...

Feather meal (FM) which is a biological bvproduct, has a high crude protein content of about 85%. However, poor digestibility and low nutritional value restrict the utilisation of FM as animal feed, most likely linked to the mechanical stability and proteolytic resistance of keratin (Lasekan et al., 2013). Chemical treatments for improving the nutritional value of feather meal were described recen ...

Calcium digestibility can vary dramatically depending on the Ca source, limestone solubility, source of phytate and addition of phytase (Li et al., 2021). However, there is no agreement in the literature about the most appropriate method for determining Ca digestibility (Li et al., 2017). In the current study, the apparent ileal Ca and P digestibility was determined in diets varying in Ca content, ...

There has been much research recently to refine broiler requirements for calcium (Ca) and phosphorus (P), especially since the routine inclusion of phytase in broiler diets (Li et al., 2016). Phosphorus and Ca play significant roles in bone metabolism and vitamin D is also pivotal to maintaining bone integrity through the modulation of Ca metabolism (Li et al., 2017). The broiler requirement for v ...

Understanding the dynamics of calcium (Ca) and phosphorus (P) metabolism is an important consideration when evaluating the requirements for both nutrients. Much more is known about the control of Ca than P metabolism (Li et al., 2017). Calcium elimination from the body is primarily through faeces, both unabsorbed dietary Ca and endogenous Ca. Kidney Ca elimination is controlled by endocrine factor ...

Phytase supplementation of broiler diets can improve energy, amino acid, calcium (Ca) and phosphorus (P) utilization. Both fungal- and bacterial-derived phytases are commonly added to broiler diets. Phytases from different sources and even from the same source can have different pH optima, heat stability, and catalytic properties (Dersjant-Li et al, 2015). Furthermore, when different microbial phy ...

Probiotics are showing promise as antibiotic replacements but more scientific evidence is required to validate their beneficial effects. Previous broiler feed trials conducted with Bacillus amyloliquefaciens strain H57 (H57) indicated variable bird performance (Bajagai, 2018). In these trials, birds were kept under “optimal” experimental conditions, where most of stressors were absent ...

The villi of the intestinal mucosa are lined by a single layer of columnar cells, comprising enterocytes, goblet and enteroendocrine cells, and various types of immune cells, each with a distinct function. Chicken gut mucosa is exposed to an enormous number of feed antigens, and pathogenic bacteria that often impair the intestinal barrier function. Ultrastructural examination of enterocytes, their ...

I. INTRODUCTIONThe first Australian Poultry Science Symposium (APSS) occurred in February 1989 and has continued annually at that time, since then. Until 2016, APSS was held at the University of Sydney but is now held in a prestigious Sydney hotel. This year, 2019 marks the 30th occasion on which APSS has been held but it is 31 years since the inaugural meeting. The discrepancy occurs because the ...