Comparative evaluation of gas production and dry matter digestibility of straw substrates in vitro


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Authors

  • Bandla Srinivas
  • K K Singh

Keywords:

Digestibility of straw, Dry matter, Gas Production

Abstract

Rumen fistulated cattle (2) were allocated into 3 groups and offered wheat straw alone (D1); supplemented with concentrate mixture (D2); and urea-molasses-mineral block (UMMB) lick (D3). Strained rumen liquor of respective animals was used as inoculum and untreated or 4% urea-treated wheat or paddy straw as substrates. In vitro gas production (IVGP) was measured at 2 hr interval for the first 12 hr (phase 1) and 4 hr of interval for the later up to 48 hr (phase 2) of inoculation. Cumulative gas production curve was sigmoidal in shape. Total gas production (TGP) increased linearly with time after 3-5 hr in D1 and 0.5-3 hr in D2 and D3. It was significantly high on diets D2 and D3 compared to D1. TGP was greater on treated straw substrates than that of untreated. The TGP showed that CO2 proportion was reduced by 3-4% in treated substrates. Methane proportion was higher on diet D1 than that of other 2 diets. The gas production pattern showed that the specific environmental conditions have an effect on the fermentabitity of the straw. Fermentation pattern of substrates observed through IVGP was confirmative with IVDMD as was also indicated by a positive correlation of 0.74 . Regression equations were developed for IVGP and IVDMD. The study indicated that the method of IVGP in evaluating low quality roughages was compatible with IVDMD method.

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How to Cite

Srinivas, B., & Singh, K. K. (2012). Comparative evaluation of gas production and dry matter digestibility of straw substrates in vitro. The Indian Journal of Animal Sciences, 68(5). https://epubs.icar.org.in/index.php/IJAnS/article/view/20818