Zinc increased with increasing phytase dose. Inositol and glycerol in the egg yolk responded clearly to the increasing dietary phytase level, with glycerol increasing but inositol decreasing (Figure 1). This may be the result of conversion of inositol to triglycerides, which could then be utilised by the chick at hatch. When incubating the eggs it was found that increasing phytase levels resulted in lower % late dead and a lower % dead in shell after pipping, which supports the hypothesis that energy supply for hatching may have been improved. Early dead % was increased though, resulting in equal overall hatchability. Inositol in the yolk sac at day of hatch showed an increase with the highest dose of phytase, which may have been used by the embryo as an energy source during hatching.
Figure 1: Yolk Inositol and Glycerol concentration, µmol/g
Signis, a dual acting combination of xylanase and xylo-oligosaccharide, accelerates the development of a fibre-degrading microbiome which:
• Enables improved fermentation of fibre sources that otherwise remain undegraded
• Delivers consistent animal performance • Improves nutrient digestibility
When the chicks that hatched were grown on it was found that
chicks from hens fed higher phytase levels were heavier at 7 days post hatch, indicating that the hen’s diet supported better growth of the progeny (FIgure 2).
Figure 2: Yolk Influence of breeder hen diet on progeny body weight (g) at 0 and 7 days of age
This work allows us to conclude that the principle of using high
doses of phytase to achieve near complete breakdown of phytate also works in adult breeder hens and that this can achieve nutritional benefits. It is highly likely that, when applying this in practice in broiler breeders, this is best combined with some further nutrient reduction in the diet, especially with regards to essential amino acids so as not to not allow egg size increases.
For further information or references please contact
emea@abvista.com
www.abvista.com
FEED COMPOUNDER JANUARY/FEBRUARY 2020 PAGE 41 11120996 Signis half page print
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