Effects of phytase supplementation on growth performance, plasma biochemistry, bone mineralisation and phosphorus utilisation in pre-lay pullets fed various levels of phosphorus
Mingyan Jing A , Shusheng Zhao A , Anna Rogiewicz B , Bogdan A. Slominski B and James D. House A B CA Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada.
B Department of Animal Science, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada.
C Corresponding author. Email: James.House@umanitoba.ca
Animal Production Science 61(6) 568-576 https://doi.org/10.1071/AN20265
Submitted: 9 June 2020 Accepted: 24 November 2020 Published: 23 February 2021
Journal Compilation © CSIRO 2021 Open Access CC BY-NC-ND
Abstract
Context: Reducing the environmental impact of animal production is becoming a really hot topic, especially with raised concerns over excessive flows of nitrogen and phosphorus (P) to the environment.
Aims: The present study was conducted to determine the effects of phytase supplementation on growth, plasma biochemistry, bone mineralisation and P utilisation of pre-lay pullets fed varying levels of non-phytate P.
Methods: A total of 240 Lohmann pullet chicks were randomly allocated to one of six dietary treatments with eight replicate cages (5 birds per cage) per treatment. Six treatments included three phytase-free diets and three diets supplemented with 1000 U/kg phytase; the non-phytate P levels were 2.75–2.50–2.25, 3.75–3.50–3.25 and 4.75–4.50–4.25 g/kg in the former, and 1.75–1.50–1.25, 2.75–2.50–2.25 and 3.75–3.50–3.25 g/kg in the latter, for the age of 0–4, 4–8 and 8–16 weeks respectively.
Key results: No significant differences were found for growth performance, plasma biochemistry (calcium, P, alkaline phosphatase and albumin) and bone mineralisation among dietary treatments, but P retention (%) was different (P < 0.001). Analysis of planned contrasts showed that phytase supplementation increased phytate P retention (P < 0.001), and improving the utilisation of phytate P tended most efficiently under low P conditions. Total P retention rate was reduced slightly by phytase supplementation (P < 0.05).
Conclusions: The results indicated that dietary non-phytate P level could possibly be reduced to 1.75, 1.50 and 1.25 g/kg for 0–4, 4–8 and 8–16 weeks of age respectively after phytase supplementation, without compromising pullet growth and performance during the pre-laying period.
Implications: The results of this study will contribute to decreasing P excretion by poultry and reducing the potential environmental impact with land application of manure.
Keywords: characteristics of bones, growth, phosphorus retention, phytase.
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