In this article, high dietary phytase intake and its effectiveness on growth performance, pancreas and nutrient digestion in broiler chickens were evaluated. The study process and results are discussed and analyzed below.
Methods:
In this study, soybean meal was substituted for full-fat soybeans to target a trypsin inhibitory level of 2.5 mg/g in the diet.
In addition, five dietary treatments were administered in this study, as follows:
PC Positive control
NC NC1 + 1500 U/Kg phytase, NC1 Negative control
NC2 + 1500 U/Kg phytase, NC2
PC diet was supplemented with Ca and phytate-free formulation.
Each diet was replicated 9 times in 8 birds for 8 to 15 days. On day 14, a sample was collected from one of the birds to examine the activity of trypsin and chymotrypsin in jejunal digestion. On day 15, all birds were slaughtered for measurement of pancreas weight and ileal digestion. Data were analyzed by one-way ANOVA.
Results:
In positive controls, trypsin inhibitor significantly reduced feed intake, crude protein (CP) digestibility, dry matter (DM) degradability, and amino acid (AA) digestibility. Trypsin activity in jejunal digestion inhibited the increase in pancreas weight.
Phytase supplementation significantly increased phosphorus digestion and had no significant effect on other measurements. In comparison of negative control 1 and negative control 2, dietary phytase deficiency resulted in decreased weight gain and feed intake, as well as increased phosphorus digestion and decreased pancreatic weight and increased cysteine by 4.5%, methionine by 2.2% compared to negative control 2.
Overall, in a high trypsin inhibitor model, phytase administration significantly increased phosphorus digestion and also improved growth performance, pancreatic response, and cysteine (Cys) digestibility-dry matter (DM)-methionine (Met) degradability.
Source:
Author/s : Qian Zhang, Frances Yan, Juxing Chen, Karen Wedekind, Mercedes Vazquez-Anon. Novus International, Inc
Published on: 11/9/2018
