EFFECT OF BIOLOGICAL TREATMENTS TO IMPROVEMENT ON IN VITRO DIGESTIBILITY FOR RICE STRAW

This study was conducted to investigate the effect of biological treatments to improvement on the in vitro digestibility disappearance for rice straw.  The parameter used in this study includes; gas-production, IVDMD, IVMOD and pH value. The experiment was divided into seven treatments:

1^st treatment: considered as control group was used 3g from straw only.
2^nd treatment: Fibrolytic enzymes group 0.3g with 3g from straw.
3^rd treatment: Fibrolytic enzymes group 0.4g with 3g from straw.
4^th treatment: Saccharomyces cerevisie group 0.3g with 3g from straw.  
5^th treatment: Saccharomyces cerevisie group 0.4g with 3g from straw.
6^thtreatment: The mix group between fibrolytic enzymes group 0.3g and Saccharomyces cerevisie group 0.3g with 3g from straw.
7^thtreatment: The mix group between fibrolytic enzymes group 0.4g and Saccharomyces cerevisie group 0.4g with 3g from straw.

 
The results showed a significant increase (P<0.05) of 6th group in gas production as compared with 3^rd group at the beginning of the experiment. Also the 3^rd group showed a significant increase (P<0.05) in gas production as compared
with 5^th group after 10 hrs. from the period of incubation. It has been observed that there was a significant increase (P <0.05) in the 3^rd group in gas produced as compared with 4^th  and 5^th  group after 12 hrs from the period of incubation. The result also showed a significant effect (P <0.05) in the 2^nd and 6^th groups in the gas production as compared with 5th group after 24 hrs the period of incubation. It has been observed after 48 hrs the period of incubation, there was a significant effect (P<0.05) in gas produced in all treated groups as compared with 5^th group. It has been noticed from the experiment that there was result a significant increase (P<0.05) in 5^th, 6^th groups of pH value as compared with 2^nd and 4^th groups. The results showed a significant effect (P<0.05) in the 3^rd group in IVDMD as compared with 6^th group, Similarly, there showed a significant effect (P<0.05) in the 1st, 3^rd, 5^th, 6^th, 7^th groups in the IVDMD as compared with 4^th group. There was also a significant effect (P<0.05) in the 3^rd in IVMOD value than that with 6^th group. It has been shown that there was a significant effect (P <0.05) in the 6^th group of IVMOD value as compared with 2^nd, 4^th and 7^th groups. Finally it has observed that there was a significant effect (P <0.05) in the control group (1^st), 5^th and 7^th groups in IVMOD value as compared with 4^th group.
It was concluded from this study that addition of fibrolytic enzymes and a combination of fibrolytic enzymes and saccharomyces cerevisie could improve digestibility of rice straw in vitro.