MATERIALS AND METHODS: The method used a completely randomized design 5 × 4, with five treatments and four replications. The substrate diet consisted of 60% forage and 40% concentrate. The culture mixture was 1.3 × 1011 CFU/mL with a 50%:50% ratio of S. harbinensis LH 991 and P. kudriavzevii B-5P. The inoculum concentrations used in this study were 0% (control), 1%, 2%, 3%, and 4%. Treatments are arranged based on differences in inoculum concentration as follows: T0: control (0%); T1: 1%; T2: 2%; T3: 3%; and T4: 4%.
RESULTS: The T4 group showed a significant increase (p < 0.01) in short-chain fatty acids (SCFA), including acetate, propionate, butyrate, valerate, isobutyrate, and isovalerate acids, compared with the other treatments. Meanwhile, T4 shows that there is no significant (p > 0.01) effect on in vitro digestibility (in vitro dry matter digestibility, in vitro organic matter digestibility, and in vitro crude fiber digestibility). However, a highly significant (p < 0.01) effect was on volatile fatty acid total, NH3, and microbial crude protein synthesis.
CONCLUSION: It is concluded that the treatment with a 4% inoculum concentration (T4) containing a mixture of S. harbinensis LH 991 and P. kudriavzevii B-5P as LAB and yeast isolated from Budu (fermented fish) in 50%:50% ratio increased SCFA and rumen fermentation significantly, whereas it did not affect in vitro digestibility.