In case you want to know or understand better the physical quality of feed pellets I would suggest you sci. papers written by Thomas Meno (Physical quality of pelleted animal feed http://www.sciencedirect.com/science/article/pii/0377840196009492) as well as Behnke (http://amena.mx/wp-content/uploads/2010/11/13KBehnke.pdf). Overall, pay attention to your cooling / drying!
Regarding binding and binders I would suggest you to:
- Increase the % of Limestone inclusion (e.g. 0,5%)
- Include pre-gelatinized starch in small % and/or some protein gels in the case your product requires high protein content as shrimp feed pellets, etc.. (e.g. Ajinomoto)
- Include some binders as lignosulphonate (1 - 1,5%) Click here
Thomas, M can be found by following this link