Interpretive Summary: Efficacy of GLDA to improve the dietary trace mineral bioavailability in broilers
By Anne Zinn
A recent study conducted by Trouw Nutrition R&D in conjunction with Wageningen University and published in the Journal of Animal Science aimed to investigate the effect of GLDA (l-Glutamic acid, N,N-diacetic acid) on trace mineral availability in diets high in Calcium and phytate. Two studies ran simultaneously: the first investigated the GLDA effect on zinc sulfate when added in molar amounts with equal chelation capacity to the added zinc and compared the effect with EDTA (ethylenediaminetetraacetic acid), also added in equal chelation capacity to zinc sulfate; the second investigated the effect of GLDA on trace mineral availability of basal feed minerals. The research team hypothesized that GLDA would improve trace mineral availability in the diets of farmed animals.
Results of the present study indicate that GLDA significantly increased the nutritional dietary availability of supplemental zinc similar to that of EDTA in diets high in phytate and without phytase. It was apparent that GLDA has a positive effect on the nutritional availability of zinc present in dietary ingredients. These results show that GLDA may be used as an effective supplement to increase the zinc bioavailability and to reduce the use of supplemental zinc levels in broiler diets. While these results are promising for supplemental zinc levels, the effect of GLDA on the availability of native copper, manganese , and iron requires further study.
The full paper can be found on the Journal of Animal Science website.