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Title: Graded, pre- and post-pelleting additions of whole wheat influences relative gizzard weight, feed conversion efficiency and energy utilisation in broiler chickens
Contributor(s): Truong, Ha (author); Liu, Sonia (author); Selle, Peter (author); Moss, Amy  (author)orcid 
Publication Date: 2016
Open Access: Yes
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Open Access Link: Access Link
Field of Research (FoR) 2008: 070204 Animal Nutrition
070202 Animal Growth and Development
Field of Research (FoR) 2020: 300303 Animal nutrition
300301 Animal growth and development
Socio-Economic Objective (SEO) 2008: 830309 Poultry
Socio-Economic Objective (SEO) 2020: 100411 Poultry
Abstract: The strategy of whole grain feeding is meeting increasing acceptance and various approaches may be adopted in pursuit of this strategy. In this study, a ground wheat-based (600 g/kg) control diet was compared with graded whole wheat additions (7.5, 15.0, 30.0%) incorporated into the ration either pre- or post-pelleting. The seven dietary treatments were offered to eight replicates (6 birds/cage) or a total of 336 male Ross 308 broiler chickens from 7 to 28 days post-hatch. A range of growth performance and nutrient utilisation parameters were determined by standard methods. Pre- pelleting whole grain additions numerically increased relative gizzard weights by up to 13.0% (16.44 versus 14.55 g/kg) at the 30% inclusion. However, post- pelleting additions significantly increased gizzard weights by up to 37.5% (20.01 versus 14.55 g/kg). Overall, whole grain feeding improved FCR (P < 0.03) by 4.35% (1.441 versus 1.506) and at 30%, pre-pelleting whole grain additions significantly improved AME, ME:GE ratios and AMEn but not at lower whole grain additions. In contrast, all three post-pelleting whole grain additions significantly enhanced nutrient utilisation with average improvements of 0.82 MJ in AME (12.89 versus 12.07 MJ/kg), 6.10% in ME:GE ratios (0.743 versus 0.700), 7.36% units in N retention (66.15 versus 58.79%) and 0.68 MJ in AMEn (11.70 versus 11.02 MJ/kg. Interestingly, there was a quadratic relationship between relative gizzard weights and AME (r = 0.650; P < 0.001) where the regression equation was as follows: AME(MJ/kg) = 3.190 + 0.936*gizzard weight(g/kg) – 0.022*(gizzard weight(g/kg))2. In this study the optimal AME of 13.15 MJ/kg, would be generated by a relative gizzard weight of 21.27 g/kg. Thus it appears that AME improvements will plateau at a given gizzard weight increase and further enlargement of the gizzard will not benefit energy utilisation. Further research should be conducted to identify how best to take advantage of whole grain feeding regimes.
Publication Type: Conference Publication
Conference Details: XXV World Poultry Congress5-9/09/2016
Source of Publication: The Proceedings of XXV World's Poultry Congress 2016 – Abstracts, p. 23-23
Publisher: World's Poultry Science Association
Place of Publication: China
Peer Reviewed: Yes
HERDC Category Description: E3 Extract of Scholarly Conference Publication
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Appears in Collections:Conference Publication
School of Environmental and Rural Science

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