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Title: Range usage or body weight has minor effect on the gastrointestinal passage rate of commercial free-range laying hen
Contributor(s): Kolakshyapati, M  (author)orcid ; Nguyen, T V (author); Sibanda, T Z  (author)orcid ; Ruhnke, I  (author)orcid 
Publication Date: 2019-10-01
Open Access: Yes
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Abstract: Free-range flocks are composed of hens that prefer to spend the majority of their time in sheds, "stayers", and hens that prefer to spend the majority of their time on the range, "rangers". While it was previously shown that rangers and stayers differ significantly in egg production, the rationale and underlying mechanism for the different performance remains unknown (Ruhnke and Sibanda, 2018). Range usage may contribute to improved digestive organ development such as the gizzard due to the positive effects of coarse fibre and grit stones leading to an increased grinding activity, and subsequently a decreased passage rate resulting in an increased exposure time of nutrients to digestive enzymes and overall increased nutrient digestibility (Amerah et al. 2009; Hetland et al. 2004). On the other hand, body weight may influence passage rate, due to a larger digestive tract convolute and subsequently larger quantities of enzyme secretion, and a larger intestinal absorption surface.
Publication Type: Conference Publication
Conference Details: RAAN 2019: Recent Advances in Animal Nutrition - Australia, Armidale, Australia, 25th - 27th October, 2019
Source of Publication: Animal Production Science, 59(11), p. i-i
Publisher: CSIRO Publishing
Place of Publication: Australia
ISSN: 1836-5787
Fields of Research (FoR) 2020: 300306 Animal welfare
Socio-Economic Objective (SEO) 2020: 100411 Poultry
Peer Reviewed: Yes
HERDC Category Description: E3 Extract of Scholarly Conference Publication
Description: Publication also known as "Recent Advances in Animal Nutrition - Australia 2019"
Appears in Collections:Conference Publication
School of Environmental and Rural Science

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