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17 results on '"Cadogan, David J"'

5. Precision feeding and precision nutrition: a paradigm shift in broiler feed formulation?

Author

Moss, Amy F, Chrystal, Peter V, Cadogan, David J, Wilkinson, Stuart J, Crowley, Tamsyn M, Choct, Mingan, Moss, Amy F, Chrystal, Peter V, Cadogan, David J, Wilkinson, Stuart J, Crowley, Tamsyn M, and Choct, Mingan

Abstract

Broiler chickens grow rapidly, and their nutrient requirements change daily. However, broilers are fed three to five diet phases, meaning nutrients are under or oversupplied throughout production. Increasing diet phases improves production efficiency as there is less time in the production cycle that nutrients are in under or over-supply. Nevertheless, the process of administering four or more diets is costly and often impractical. New technologies are now available to blend feed to match the daily nutrient requirements of broilers. Thus, the aim of this review is to evaluate previous studies measuring the impact of increasing feed phases on nutrient utilisation and growth performance, and review recent studies taking this concept to the extreme; precision nutrition - feeding a new diet for each day of the production cycle. This review will also discuss how modern precision feeding technologies have been utilised and the potential that new technologies may bring to the poultry industry. The development of a precision nutrition regime which targets daily requirements by blending dietary components on farm is anticipated to improve the efficiency of production, reduce production cost and therefore improve sustainability of the industry. There is also potential for precision feeding technology along with precision nutrition strategies to deliver a plethora of other management and economic benefits. These include increased fluidity to cope with sudden environmental or market changes, and the ability to alter diets on a farm by farm level in a large, integrated operation. Thus, the future possibilities and practical implications for such technologies to generate a paradigm shift in feed formulation within the poultry industry to meet the rising demand for animal protein is also discussed.

Published
2021

9. Dietary inclusion of a Saccharomyces cerevisiaemetabolite improved reproductive performance but did not affect intestinal permeability in two chicken meat breeder lines

Author

Forder, Rebecca EA, Willson, Nicky-Lee, Angove, Joshua A, McWhorter, Todd J, McQueen, Matthew A, and Cadogan, David J

Abstract

Gastrointestinal dysbiosis is a disturbance in mucosal homeostasis, producing low-grade chronic intestinal inflammation and impaired intestinal barrier function. It is induced by several factors, including nutrition and stress, which are both significant factors when considering current broiler breeder practices. A great grandparent (GGP) chicken meat line was identified displaying clinical signs characteristic of potential dysbiosis, including wet droppings and litter, in addition to reduced reproductive performance when compared to a consistently high performing line. This study aimed to determine whether the reduced reproductive performance observed in these hens was a result of dysbiosis and whether dietary supplementation with a Saccharomyces cerevisiae(SC) fermentation product would alleviate clinical signs. Dietary inclusion of SC did not influence intestinal permeability, WBC differentials, or corticosterone concentration in either the wet litter (WL) or high-performing (HP) breeder lines. Compared to hens from the HP line, WL line hens had a significant increase in intestinal permeability at 26 wk (onset of lay). WL hen heterophil counts were increased markedly at week 26 before declining. At weeks 26, 32, and 37 there were also significant increases in monocytes. Higher plasma corticosterone was also observed in WL hens at 37 wk. No significant differences in heterophil to lymphocyte (H:L) ratios or feather corticosterone were observed between lines. Dietary inclusion of SC supplementation to breeder diets had some benefit in regards to reducing hen mortality, improving egg production and hatchability but only in the WL line. Results from this study did not indicate that hens from the wet litter line were experiencing gut dysbiosis. Chronic intestinal inflammation may be a possible reason for the increase in intestinal permeability. These results do indicate that both breeder lines may be exhibiting physiological stress. Future investigation into the physiology and behavior around point of lay is required to find novel strategies to alleviate this stress and in turn, potentially improve welfare and production outcomes.

Published
2024
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12. Comparative performance of broiler chickens offered nutritionally equivalent diets based on six diverse, ‘tannin-free’ sorghum varieties with quantified concentrations of phenolic compounds, kafirin, and phytate

Author

Truong, Ha H., primary, Neilson, Karlie A., additional, McInerney, Bernard V., additional, Khoddami, Ali, additional, Roberts, Thomas H., additional, Cadogan, David J., additional, Liu, Sonia Yun, additional, and Selle, Peter H., additional

Published
2017
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17. Outlook: sorghum as a feed grain for Australian chicken-meat production

Author

Selle, Peter H., Moss, Amy F., Truong, Ha H., AliKhoddami, Cadogan, David J., Godwin, Ian D., and Liu, Sonia Y.

Subjects
Meat, Poultry industry, Business, international
Abstract

Abstract This review is an outlook for sorghum as a feed grain for broiler chickens based on a survey of relevant stake-holders and recent research outcomes. Australian grain sorghum production [...]

Published
2017

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