Document Detail

Effects of increasing concentrations of wet distillers grains with solubles in steam-flaked corn-based diets on energy metabolism, carbon-nitrogen balance, and methane emissions of cattle.
MedLine Citation:
PMID:  23148244     Owner:  NLM     Status:  Publisher    
The use of wet distillers grains with solubles (WDGS) in feedlot diets has increased in the Southern Great Plains as a result of the growing ethanol industry. Nutrient balance and respiration calorimetry research evaluating the use of steam-flaked corn (SFC)-based diets in conjunction with WDGS is limited. Therefore, the effects of increasing concentrations of WDGS in a SFC-based diet on energy metabolism, carbon (C) and nitrogen (N) balance, and enteric methane (CH(4)) production were evaluated in Jersey steers fed at 2-times maintenance using respiration calorimetry chambers. Four treatments were used in a two 4 x 4 Latin square designs using a total of 8 steers. Treatments consisted of: (1) SFC-based diet with 0% WDGS (SFC-0); (2) SFC-based diet with 15% WDGS (SFC-15); (3) SFC-based diet with 30% WDGS (SFC-30); and (4) SFC-based diet with 45% WDGS (SFC-45). Diets were balanced for degradable intake protein (DIP) by the addition of cottonseed meal to the SFC-0 diet. As a proportion of GE, fecal, urinary, and CH(4) energy increased linearly (P < 0.03) as WDGS concentration increased in the diet. In contrast, DE, ME, and retained energy decreased linearly (P < 0.01) as a proportion of GE as WDGS concentration increased. Increasing concentration of WDGS in the diet did not affect (P > 0.78) heat production as a proportion of GE. As a result of greater N intake, total N excretion increased linearly (P < 0.01) with increasing WDGS inclusion in the diet. Fecal C loss and CH(4)-C respired increased linearly (P < 0.01) when WDGS concentration increased in the diet; whereas, CO(2)-C respired decreased (linear, P = 0.05) as WDGS concentration increased. We conclude that CH4 production as a proportion of GE increases linearly (P < 0.01) when WDGS concentration in the diet is increased; however, dietary inclusion of WDGS at up to 45% seems to have no effect (P ≥ 78) on heat production as a proportion of GE. The reason for a linear decrease in RE as WDGS increased was likely because of the increased fecal energy loss associated with feeding WDGS. Total N excretion, fecal C loss and CH(4)-C respired increased linearly with increasing concentration of WDGS in the diet. We determined the NEg values for WDGS to be 2.02, 1.61, and 1.38 Mcal/kg when included at 15, 30, and 45%, respectively, in a SFC-based diet. From these results we conclude that the energy value (NEg) of WDGS in a finishing cattle diet based on SFC must be decreased as the inclusion increases.
K E Hales; N A Cole; J C Macdonald
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-12
Journal Detail:
Title:  Journal of animal science     Volume:  -     ISSN:  1525-3163     ISO Abbreviation:  J. Anim. Sci.     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
USDA-ARS U.S. Meat Animal Research Center, Clay Center, NE 68933.
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