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Research (Published online: 26-10-2016)

17. In-vitro fermentation characteristics and methane reduction potential of mustard cake (Brassica juncea L.) - S. M. Durge, M. K. Tripathi and N. Dutta

Veterinary World, 9(10): 1141-1146

 

 

   doi: 10.14202/vetworld.2016.1141-1146

 

 

S. M. Durge: Division of Nutrition, Feed Resource and Product Technology, Central Institute for Research on Goats, Mathura - 281 122, Uttar Pradesh, India; sdurge5@gmail.com

M. K. Tripathi: Division of Nutrition, Feed Resource and Product Technology, Central Institute for Research on Goats, Mathura - 281 122, Uttar Pradesh, India; mktripathi@gmail.com

N. Dutta: Division of Animal Nutrition, Indian Veterinary Research Institute, Bareilly - 243 122, Uttar Pradesh, India; dutta65@gmail.com

 

Received: 24-06-2016, Accepted: 07-09-2016, Published online: 26-10-2016

 

Corresponding author: S. M. Durge, e-mail: sdurge5@gmail.com


Citation: Durge SM, Tripathi MK, Dutta N (2016) In-vitro fermentation characteristics and methane reduction potential of mustard cake (Brassica juncea L.), Veterinary World, 9(10): 1141-1146.



Aim: To assess the effect of mustard cake (Brassica juncea L.) levels in concentrate mixtures and in composite feed mixtures (CFMs) on in-vitro fermentation characteristics and methane production.

Materials and Methods: Five concentrate mixtures were prepared with containing 30% oil cake, where linseed cake was replaced by mustard cake at the rate of 0%, 7.5%, 15.0%, 22.5%, and 30% in concentrate mixture. Mustard cake contained glucosinolate 72.58 μmol/g oil free dry matter (DM) and contents in diet were 0, 5.4, 10.9, 16.3, and 21.8 μmol/g of concentrate mixture, respectively. Concentrate mixture containing 15.0% mustard cake was found to produced minimum methane which was then used for the preparation of CFM containing 0%, 25%, 50%, and 75% levels with gram straw.

Result: Increased levels of mustard cake in concentrate mixtures had a linear decrease (p<0.05) in the total gas production, and the 15% inclusion showed lowest methane concentration (quadratic, p<0.01). The degradability of DM and organic matter (OM) of concentrate mixtures did not change, however, pH and NH3-N concentrations of the fermentation medium showed linear (p<0.05) reductions with increased mustard cake levels. Increased levels of 15% mustard cake containing concentrate mixture in CFMs exhibited a trend (p=0.052) of increased gas production, whereas methane concentration in total gas, methane produced and degradability of DM and OM were also displayed a linear increase (p<0.05). However, the pH, NH3-N, and total volatile fatty acid levels decreased linearly (p<0.05) with increased levels of concentrate in CFMs.

Conclusion: Reduction in methane production was evidenced with the inclusion of mustard cake in concentrate mixture at 15% level, and the CFMs with 25% concentrate, which contained 15% mustard cake, exhibited an improved fermentation and reduced methane production.

Keywords: Brassica, glucosinolate, mustard cake, methane, rumen fermentation.



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