In vitro fermentability and digestibility of seedless noni waste (Morinda citrifolia L.) as a concentrate substitute in lactating dairy goat diet

Abstract

Noni waste (Morinda citrifolia L.) is waste from noni juice that contain high lignin but still having bioactive compounds such as polyphenols and saponins. In this study, around 75% of lignin content was reduced by removal the seeds from noni waste. The aims of this research were to evaluate by in vitro's method the potency of seedless noni waste (SNW) as a concentrate substitute in lactating dairy goat diet. Randomized Block Design were applied with 3 times rumen fluid intake and 6 diets treatment i.e. R0 = 60% Napier Grass (NG) + 40% Concentrate (control); R1 to R5 = 60% NG + 5 to 25% SNW + 35 to 15% Concentrate. The variables were pH, fermentability (NH3 and total VFA), microbial protein synthesis, total bacteria and protozoa population, dry matter and organic matter digestibility. The results showed there were no differences among diets for all variables except the fermentability (NH3 and total VFA) and microbial protein synthesis (P<0.05) that showed increasing quadratically (P<0.01) by addition of SNW and achieved the peak at 15% SNW. It can be concluded that 15% of seedless noni waste (SNW) is able to substitute 37.5% of concentrate in lactating dairy goat diet with ratio of 60% forages and 40% concentrate. The diet is able to support fermentability and microbial protein synthesis without interfere the microbial population as well as in vitro digestibility.