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Rumen Fermentation Parameters and Microbial Protein Synthesis in Dairy Cattle Fed Rice Straw, Corn Stover, or King Grass as Basal Diet Supplemented with Balance Energy and Protein Concentrate
Thesis Abstract:
The study used five female rumen fistulated dairy cattle to investigate rumen fermentation parameters and 15 female dairy cattle to estimate rumen microbial protein synthesis. The cattle fed rice straw (RS), corn stover (CS), or King grass (KG) ad libitum as basal diet supplemented with balance energy and protein concentrate. Data on NH3, volatile fatty acids (VFA), pH, and microbial protein synthesis (MPS) were analyzed using analysis of variance with split plot and completely randomized design. Mean differences were analyzed using Duncan multiple range test (DMRT). Results showed that rumen NH3 concentration in cattle receiving King grass and rice straw as basal diet was significantly higher than cattle receiving corn stover (9.86 and 9.41 vs. 4.88 mg/100 mL). Rumen fluid VFA concentration of cattle receiving rice straw, corn stover, and King grass was 77.32, 83.43, and 84.78 mmol/L, respectively; the differences among diet’s value were not significant. The rumen fluid pH of dairy cattle with rice straw, corn stover, and King grass basal diet was significantly different--corn stover’s pH was higher than rice straw and King grass (7.20 vs. 7.15 and 7.14). The value of rice straw and King grass as basal diet was not different at all. The microbial protein synthesis values were 13.60, 19.53, and 23.19 gN/day for King grass, corn stover, and rice straw, respectively, significantly different among diets (p < .01).