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Effects of Feed Particle Size and Hydro-Thermal Processing Methods on Starch Modification, Nutrient Digestibility and the Performance and the Gastrointestinal Tract of Broilers

1
Institute of Nutritional Physiology, Oskar Kellner, Leibniz Institute for Farm Animal Biology, 18196 Dummerstorf, Germany
2
Institute of Animal Nutrition, Friedrich Loeffler Institut, Federal Institute for Animal Health, 38116 Brunswick, Germany
3
Group Animal Nutrition, Institute of Agricultural and Nutritional Sciences, Martin Luther University Halle-Wittenberg, 06120 Halle (Saale), Germany
4
Research Institut of Feed Technology of the International Research Association of Feed Technology e.V., 38110 Brunswick, Germany
*
Author to whom correspondence should be addressed.
Animals 2019, 9(6), 294; https://doi.org/10.3390/ani9060294
Received: 3 May 2019 / Revised: 24 May 2019 / Accepted: 27 May 2019 / Published: 30 May 2019
(This article belongs to the Section Animal Nutrition)
Technological benefits of feed processing methods are well defined but not their benefits and disadvantages for broiler feeding. The current study tested the impact of feed particle size and various hydro-thermal processing methods (HTPM) on feed value, broiler performance and alterations of the digestive tract. It was shown that HTPM influences physico-chemical characteristics of the feed including starch modifications. The compaction process during pelleting contributes to the reduction of feed wastage and selection. However, the high daily feed intake caused by pellet feeding is also a main risk factor for proventricular dilatation.
Influences of feed particle size (coarse, fine) and hydro-thermal processing methods (HTPM) (without–non-compacted feed, pelleting, expanding and pelleting) on feeding value and the performance and digestive tract of 624 broilers were studied. HTPM increased the starch disintegration of feed. Starch disintegration and electron microscopy indicated the highest degree of starch modification in expanded and pelleted feed. HTPM affected ether extract digestibility (p < 0.05). A grinding-by-HTPM interaction was found in case of crude protein digestibility (p = 0.008). Non-compacted feed reduced daily feed intake (DFI) and body weight gain and increased the feed to gain ratio compared to compacted feeds (p < 0.001). Compacted feeds increased proventricular size and the risk of Isthmus gastrici dilatation compared to coarsely ground non-compacted feed, except for finely ground expanded and pelleted feed. Finely ground feed reduced proventricular weights compared to coarsely ground feed and pelleted feed compared to other feeds. Non-compacted feed increased gizzard weights compared to compacted feeds. Relationships between proventricular size and Isthmus gastrici dilatation and the DFI were detected. Summarizing, the beneficial effects of pelleted feed were mainly based on the reduction of feed wastage and selection. However, the high DFI caused by pellet feeding is also a main risk factor for proventricular dilatation. View Full-Text
Keywords: broiler performance; technical feed treatment; proventriculus; gizzard broiler performance; technical feed treatment; proventriculus; gizzard
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MDPI and ACS Style

Liermann, W.; Bochnia, M.; Berk, A.; Böschen, V.; Hüther, L.; Zeyner, A.; Dänicke, S. Effects of Feed Particle Size and Hydro-Thermal Processing Methods on Starch Modification, Nutrient Digestibility and the Performance and the Gastrointestinal Tract of Broilers. Animals 2019, 9, 294.

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