Article published the May 3, 2022
INTRODUCTIONThere has been a substantial global expansion in egg production by the layer industry as the volume of egg production has increased by 119% (35.5 vs. 76.8 million tonnes) from 1990 to 2018 ( (Food and Agricultural Organization of the United Nations, 2018). This growth represents an average annual increase of 2.84%. China produced 458 billion eggs in 2018, and the USA ...
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Article published the April 6, 2022
1. IntroductionThe conversion of dietary protein and amino acids into the protein of chicken-meat is indeed a dynamic process. Quite typically, broiler chickens attain a live weight of 2.918 kg at 42 days post-hatch and a carcass weight of 2.151 kg following processing. This translates to 376 g of carcass protein as a Ross 308 broiler carcass contains 175 g/kg protein [1]. Broiler chickens consume ...
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Article published the March 7, 2022
I. INTRODUCTIONGlobal chicken-meat production has been predicted to increase considerably between 2005 and 2050 (Alexandratos and Bruisma, 2012) and this demands sustainable practices. Reducing dietary crude protein (CP) substantially without compromising broiler performance has the potential to provide tangible reductions in nitrogen excretion and environmental pollution, with improved bird welfa ...
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Article published the February 25, 2022
I. INTRODUCTIONThe concept of “fast” and “slow” proteins in human nutrition was enunciated by Beaufrère et al. (2000) and consideration has been given to protein and starch digestive dynamics in poultry by Liu and Selle (2015). However, the digestion rate of protein has a greater bearing on broiler growth performance than that of starch (Liu et al. 2014). Thus, the o ...
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Article published the January 31, 2022
I. INTRODUCTIONBoth glucose and amino acids are essential for muscle protein deposition and feed conversion efficiency and total tract nitrogen retention was reported to be influenced by protein and starch digestion in broiler chickens (Liu et al., 2013). Liu and Selle (2015) found that 76% of the variation in the feed-conversion ratio (FCR) could be attributed to starch and protein digestion rate ...
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Article published the January 4, 2022
I. INTRODUCTIONGlobally, maize and wheat are the major cereal grains used in broiler feed. Maize is predominant in Asia and the Americas, whereas wheat is in Australia, New Zealand and Europe. Extensive research has been undertaken in refining dietary strategies to optimise broiler performance when offered reduced crude protein (CP) diets. In feed, these grains have been optimized by the inclusion ...
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Article published the December 6, 2021
I. INTRODUCTIONReductions in crude protein (CP) contents of broiler diets have been realised for decades by routine additions of unbound (synthetic or crystalline) methionine, lysine and threonine, and are likely to continue as inclusion costs for the balance of amino acids become more feasible. Reduced-CP diets have the potential to provide environmental advantages from attenuated nitrogen and am ...
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Article published the December 6, 2021
I. INTRODUCTIONInteractions among the branched-chain amino acids (BCAA) have long been observed in poultry (D’Mello and Lewis, 1970; Tuttle and Balloun, 1976; Mendonca and Jensen, 1989), but their effects on broiler performance have been contested with various researchers reporting no effects of BCAA interactions on broiler performance in practical diets (Burnham et al., 1992; Barbour and La ...
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Article published the November 18, 2021
I. INTRODUCTIONThe inclusion of exogenous phytases in diets for broiler chickens has developed into a routine practice because of their positive phosphoric and extra-phosphoric effects. On one hand, phytase liberates phytate-bound phosphorus (PP) which is found in all plant-sourced feedstuffs as the dominant P fraction. On the other, phytase enhances amino acid (AA) digestibilities, essentially be ...
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Article published the November 18, 2021
I. INTRODUCTIONThe AgriFutures Australia Chicken Meat Program funds research, development and extension activities for the benefit of the Australian chicken meat industry. Through the process of reviewing the 5-year strategic plan (RIRDC, 2014), the objectives were adjusted to align each objective with a stage of chicken meat production. This included the consolidation of all research related to t ...
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