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Journal of Animal and Veterinary Advances
Year: 2010 | Volume: 9 | Issue: 19 | Page No.: 2537-2545
DOI: 10.3923/javaa.2010.2537.2545  
Role of Lactulose as a Modifier in Rumen Fermentation
Armagan Hayirli , Huzur Derya Umucalilar , Nurettin Gulsen and Ozcan Baris Citil
 
Abstract: This in vitro experiment was conducted to examine the effects of lactulose (0, 2 or 4%) on ruminal fermentation of mixtures differing in the forage:concentrate ratio (F:C; 20:80, 40:60 or 60:40). Ruminal fluids collected from two Holstein steers were incubated with the mixtures for 48 h. Data were subjected to 2 way ANOVA. Lactulose did not alter ruminal fluid pH, ammonia and lactate concentrations, individual and total Volatile Fatty Acid (VFA) concentrations and gas production. There was a linear increase in ruminal fluid pH from 6.71-6.76 (p<0.0001), a linear decrease in ammonia concentration from 15.84-11.77 mmol L-1 (p<0.0001), a quadratic increase in lactate concentration from 25.51-26.91 mmol L-1 (p<0.04) as the F:C ratio increased from 10:80-60:40. Moreover, increasing the forage level caused linear increases in the acetate (from 53.89-55.69%; p<0.0002) and valerate (from 3.05-3.25%; p<0.003) proportions and a linear decrease in the butyrate proportion (from 19.74-17.32%; p<0.0001) and a linear decrease in cumulative gas production from 41.14-33.54 mL (p<0.0001). The effects of the F:C ratio and lactulose level on gas kinetics parameters were variable. Lactulose addition failed to modify alterations in rumen fermentation characteristics of the mixtures varying in the F:C ratio. In conclusion, lactulose fermentation in ruminal fluids had minimal effects on fermentability of the mixture consisting of different F:C ratios suggesting that lactulose does not modify alterations in rumen fermentation in cattle during their growth and lactation phases.
 
How to cite this article:
Armagan Hayirli, Huzur Derya Umucalilar, Nurettin Gulsen and Ozcan Baris Citil, 2010. Role of Lactulose as a Modifier in Rumen Fermentation. Journal of Animal and Veterinary Advances, 9: 2537-2545.
DOI: 10.3923/javaa.2010.2537.2545
URL: http://medwelljournals.com/abstract/?doi=javaa.2010.2537.2545