Over-processed meat and bone meal and phytase effects on broilers challenged with subclinical necrotic enteritis: Part 1. Performance, intestinal lesions and pH, bacterial counts and apparent ileal digestibility

Title
Over-processed meat and bone meal and phytase effects on broilers challenged with subclinical necrotic enteritis: Part 1. Performance, intestinal lesions and pH, bacterial counts and apparent ileal digestibility
Publication Date
2020-09
Author(s)
Zanu, Holy K
( author )
OrcID: https://orcid.org/0000-0003-0518-6206
Email: hzanu@myune.edu.au
UNE Id une-id:hzanu
Kheravii, Sarbast K
Morgan, Natalie K
( author )
OrcID: https://orcid.org/0000-0002-9663-2365
Email: nmorga20@une.edu.au
UNE Id une-id:nmorga20
Bedford, Michael R
Swick, Robert A
( author )
OrcID: https://orcid.org/0000-0003-3376-1677
Email: rswick@une.edu.au
UNE Id une-id:rswick
Type of document
Journal Article
Language
en
Entity Type
Publication
Publisher
Zhongguo Xumu Shouyi Xuehui, Chinese Association of Animal Science and Veterinary Medicine
Place of publication
China
DOI
10.1016/j.aninu.2020.03.004
UNE publication id
une:1959.11/30910
Abstract
This feeding study investigated the hypothesis that over-processing of meat and bone meal (MBM) would impair the performance, gut health and ileal digestibility of nutrients in birds challenged with necrotic enteritis (NE). The effect of phytase (500 vs. 5,000 FTU/kg) was also examined using manufacturers recommended matrix values for 500 FTU for both levels. Ross 308 male broilers (n=768) were assigned to 8 diets, with 6 replicate pens per diet and 16 birds per replicate pen using a randomized design with a factorial arrangement of treatments. Factors were NE challenge (no or yes), MBM (as received or over-processed), and phytase level (500 or 5,000 FTU/kg). Half of the birds were challenged with 5,000 oo-cysts offield strains of Eimeria acervulina and Eimeria brunetti, and 2,500 oocysts of Eimeria maxima on d 9 and 108 CFU/mL of Clostridium perfringens strain EHE-NE18 on d 14 and 15 post-hatch. Challenge × MBM interactions were detected for weight gain (WG), feed conversion ratio (FCR) and feed intake (FI) at d 14, 21 and 28, showing that challenged birds fed over-processed MBM had decreased WG (P<0.05) and FI (P<0.05) at d 14, increased FCR (P<0.05) at d 21 and decreased WG (P<0.05) and FI (P>0.05) at d 28. Birds fed low phytase had increased livability (P<0.05) at d 42. The challenge increased the prevalence and severity of NE induced lesions in the jejunum (P<0.05) and ileum (P<0.05). The birds fed over-processed MBM had decreased pH in the jejunum (P<0.05) and ileum (P<0.05) at d 16. High phytase increased apparent ileal digestibility (AID) of Ca (P<0.05) and P(P<0.05), and over-processed MBM increased AID of carbon (C;P<0.05) and Ca (P<0.05) at d 29. The challenge increased the caecal counts of Lactobacillus spp. (P<0.05) and C. perfringens(P<0.05) at d 16. The results indicated that supplementation of diets with high phytase reduces the negative impact on performance from over-processed MBM during NE as a result of increased nutrient digestibility.
Link
Citation
Animal Nutrition, 6(3), p. 313-324
ISSN
2405-6383
2405-6545
Pubmed ID
33005765
Start page
313
End page
324
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International

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