Comparative performance of broiler chickens offered ten equivalent diets based on three grain sorghum varieties as determined by response surface mixture design

Author(s)
Liu, S Y
Truong, H H
Khoddami, A
Moss, A F
Thomson, P C
Roberts, T H
Selle, P H
Publication Date
2016-08
Abstract
Ten nutritionally-equivalent diets containing 620 g/kg grain sorghum, based on seven blends and three varieties (Block I, HP, Liberty), were offered to a total of 360 male Ross 308 chicks from 7 to 28 days post-hatch. The effects of dietary treatments on growth performance, nutrient utilisation, starch and protein (Nitrogen) digestibility coefficients, disappearance rates and starch:protein disappearance rate ratios in the distal jejunum and distal ileum were determined. On the basis of response surface contour plots, the optimal weight gain of 1439 g/bird would be generated by a 79.2-20.8 blend of HP and Liberty and the optimal feed conversion ratio (FCR) of 1.486 by a 55.6-44.4 HP-Liberty blend. Similarly, the optimal nitrogen-corrected apparent metabolisable energy (AMEn) of 12.38 MJ would be generated by a 32.0-68.0 blend of HP and Liberty and the optimal apparent metabolisable energy to gross energy (AME:GE) ratio of 0.845 by a 31.1-68.9 HP-Liberty blend. Thus Block I sorghum was effectively rejected. Instructively, Block I contained higher concentrations of kafirin, phenolic compounds and phytate than the two other sorghum varieties. Across the ten diets, sorghum concentrations of these three factors were negatively correlated with AME:GE ratios or efficiency of energy utilisation. These negative linear regressions indicate that all three factors may be contributing to sub-standard starch/energy utilisation in broiler chicks offered sorghum-based diets.
Citation
Animal Feed Science and Technology, v.218, p. 70-83
ISSN
1873-2216
0377-8401
Link
Publisher
Elsevier BV
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International
Title
Comparative performance of broiler chickens offered ten equivalent diets based on three grain sorghum varieties as determined by response surface mixture design
Type of document
Journal Article
Entity Type
Publication

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