Influence of two levels of phytic acid and particle size of oyster shell on the performance, calcium digestibility, gastrointestinal pH, and bone traits in broilers
Influence of two levels of phytic acid and particle size of oyster shell on the performance, calcium digestibility, gastrointestinal pH, and bone traits in broilers
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Date
2023-09
Authors
Kwabla Zanu, Holy
Iddrisu, M.
Fosu, B. G.
Ketemepi, H. K.
Bedford, M. R.
Journal Title
Journal ISSN
Volume Title
Publisher
Taylor & Francis & British Poultry Science Ltd
Abstract
1. Phytic acid (PA) is an antinutritional factor in poultry diets. The effect of high dietary PA
in chicken diets might be exacerbated when the particle size of oyster shell (OS) is too fine.
Thus, this study investigated the hypothesis that high PA with fine OS particle size would impair
growth in broilers.
2. Two hundred and eighty Cobb 500 broilers were assigned to four diets in a 2 × 2 factorial
arrangement in a CRD. The factors were PA (low or high) and OS particle size (fine or coarse) in
starter, grower and finisher diets. Data collected were performance, Ca digestibility,
gastrointestinal pH and bone traits.
3. On d 21, high PA increased intake (P<0.05), gain (P=0.099) and body weight (BW;
P=0.093) compared to low PA. On d 42, high PA increased BW (P=0.086) and gain (P=0.089)
Accepted for publication 11 August 2023
compared to low PA. High PA increased intake (P=0.063), BW (P=0.054) and gain (P=0.056)
compared to low PA on d 56. High PA improved liveability on d 56 (P<0.05) compared to low
PA. In birds fed coarse OS, crop and ileal pH were reduced (P<0.05) by high PA on d 28. The
OS × PA interaction was observed for ileal pH (P<0.05) on d 56, where in birds fed coarse OS,
low PA increased ileal pH. Fine OS increased crop (P=0.056) and proventriculus pH (P<0.05) on
d 56. There were no treatment effects on calcium digestibility. In birds fed fine OS, high PA
decreased the BS (P<0.05).
4. Overall, the study showed that a combination of high PA and coarse OS particle size
improves the production performance of broilers, while low PA and coarse OS improve their
bone health.
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Citation
Zanu, H. K., Iddrisu, M., Fosu, B. G., Ketemepi, H. K., & Bedford, M. R. (2023). Influence of two levels of phytic acid and particle size of oyster shell on the performance, calcium digestibility, gastrointestinal pH, and bone traits in broilers. British Poultry Science, (just-accepted).