Are you already thinking about integrating tumeric in your feeding program? We are sure that you need more infomation about other parameters, before you can answer this question positively. Perfect timing to look at turmeric’s influence on animals’ performance – in vitro as well as in vivo.
After reading this article you will know about
- … studies in livestock animals
- … potential growth performing effects of turmeric
- … the reason of inconsistent effects
What about the performance of turmeric regarding livestock animals?
In contrast to the detailed effects on inflammatory and oxidative processes observed in vitro with pure curcumin, in vivo studies using turmeric rhizomes and its preparations show inconsistent results on health-related parameters. Therefore, it is important to carefully review studies in livestock animals to evaluate potential growth performance enhancing effects. Studies cited in Table 1 show effects of dietary supplementation with turmeric rhizome powder on growth performance in broiler chickens. The results reveal inconsistent effects on growth performance, although similar concentrations have been used in these studies. However, there seems to be at least some consistency in improving feed efficiency in poultry. In post-weaning piglets, two studies with dietary inclusion of turmeric rhizome powder or curcumin showed no effects on growth performance. Based on the small sample size of these studies, it can be concluded that in vivo effects on growth performance in poultry and pigs are not consistent.
In vivo vs. in vitro: What makes the difference?
In vivo, mostly ground rhizomes of turmeric are used as food or feed supplement, were active substances need to make the passage through the intestinal tract. From there, they need to be absorbed into the bloodstream and transported through the body for systematic effects. However, the bioavailability of curcumin is poor and the low uptake through the intestinal tract may be one of the main issues, why inconsistent effects are observed in animals and humans. In addition, ground rhizomes as natural product vary in their composition depending for example on harvest time, environmental conditions and variety. Similar quantities of turmeric powder might therefore differ significantly in their content of active substances.
In contrast, most in vitro experiments use cell cultures and the pure active compounds, especially curcumin, will be applied
directly on these. Therefore, the issues of varying concentrations of actives and transportation to the site of interest are no issue in vitro. These circumstances may be an explanation for the difference between in vivo and in vitro observation.