Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/26756
Title: Phytase inclusions of 500 and 2000 FTU/kg in maize-based broiler diets impact on growth performance, nutrient utilisation, digestive dynamics of starch, protein (N), sodium and IP₆ phytate degradation in the gizzard and four small intestinal segments
Contributor(s): Truong, Ha H (author); Yu, Shukun (author); Moss, Amy F  (author)orcid ; Partridge, Gary G (author); Liu, Sonia Y (author); Selle, Peter H (author)
Publication Date: 2017-01
Early Online Version: 2016-11-03
DOI: 10.1016/j.anifeedsci.2016.10.018
Handle Link: https://hdl.handle.net/1959.11/26756
Abstract: The objective was to investigate the effects of 500 and 2000 FTU/kg phytase inclusions in maize–based diets with appropriately reduced nutrient specifications in comparison to a positive control diet. Diets were offered to Ross 308 broiler chickens from 7 to 28 days post-hatch and growth performance, nutrient utilisation parameters, sodium, starch and protein (N) digestibility coefficients were obtained in four small intestinal segments and IP₆ phytate degradation coefficients were determined in the gizzard and in four small intestinal segments. The transition from positive control to negative control diets compromised weight gains, FCR and toe ash by 10.3%, 6.57% and 11.5%, respectively. However, 2000 FTU/kg phytase supplementation completely restored these parameters. At 500 FTU/kg phytase significantly increased starch digestibility coefficients by 12.7% (0.879 versus 0.780) in the distal jejunum and by 4.41% (0.947 versus 0.907) in the proximal ileum and significantly increased starch disappearance rates in all four small intestinal segments. Significant increases in protein (N) digestibility and disappearance rates were limited to the proximal ileum where 500 FTU/kg phytase increased protein (N) digestibility coefficients by 6.08% (0.785 versus 0.740). Phytase, at both inclusions, significantly increased the recovery of sodium in the three anterior small intestinal segments. Interestingly, sodium digestibility coefficients were correlated (P = 0.051 − <0.001) with starch and protein (N) digestibility coefficients in all four small intestinal segments. The greatest IP₆ degradation of 95.5% was observed in the gizzard from 2000 FTU/kg phytase. However, surprisingly high gizzard IP₆ degradation rates were observed in both non-phytase supplemented diets. In contrast, phytate degradation was far more pronounced in the negative control than the positive control diet in four small intestinal segments. This phytate degradation may be to the consequence of an up-regulation of endogenous mucosal phytase activity generated by the phosphorus deficient diet coupled with the lower calcium concentration facilitating mucosal phytase activity. Weight gain was correlated with phytate degradation in the gizzard (r = 0.789; P < 0.001) to a more significant extent than in the four small intestinal segments. Consideration is given to the possibility that phytase may be enhancing intestinal uptakes of glucose via Na⁺-dependent transport systems.
Publication Type: Journal Article
Source of Publication: Animal Feed Science and Technology, v.223, p. 13-22
Publisher: Elsevier BV
Place of Publication: Netherlands
ISSN: 1873-2216
0377-8401
Fields of Research (FoR) 2008: 070204 Animal Nutrition
070202 Animal Growth and Development
Fields 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
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Appears in Collections:Journal Article
School of Environmental and Rural Science

Files in This Item:
1 files
File SizeFormat 
Show full item record

SCOPUSTM   
Citations

19
checked on Apr 6, 2024

Page view(s)

944
checked on Apr 2, 2023

Download(s)

4
checked on Apr 2, 2023
Google Media

Google ScholarTM

Check

Altmetric


Items in Research UNE are protected by copyright, with all rights reserved, unless otherwise indicated.