| 
              
              
              Open Access  
 
              
              
              
              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. 
 
              
				Abstract 
 
				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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