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United States Department of Agriculture

Agricultural Research Service


item Animut, G.
item Puchala, R.
item Goetsch, A.
item Sahlu, T.
item Detweiler, G.
item Patra, A.
item Varel, Vincent
item Wells, James - Jim

Submitted to: American Society of Animal Science Annual Meeting
Publication Type: Abstract only
Publication Acceptance Date: 2/22/2006
Publication Date: 7/10/2006
Citation: Animut, G., Puchala, R., Goetsch, A., Sahlu, T., Detweiler, G., Patra, A., Varel, V., Wells, J. 2006. Methane emission by goats consuming diets with different levels of condensed tannin-containing lespedeza and sorghum-sudangrass [abstract]. Journal of Animal Science 84(Suppl. 1):26.

Interpretive Summary:

Technical Abstract: Boer (7/8) x Spanish wethers (24; BW = 34.1 kg, SE = 1.02) were used to determine effects of dietary levels of a condensed tannin (CT)-containing forage Kobe lespedeza (Lespedeza striata; K) and sorghum-sudangrass (Sorghum bicolor; G) on methane emission. Treatments were K levels (DM basis) of 100, 67, 33, and 0% (100K, 67K, 33K, and 0K, respectively). Forages harvested daily were fed at 1.3 times the maintenance energy requirement. The experiment lasted 21 d, with measures on the last 8 d. N was 1.7 and 2.2%, in vitro true DM digestibility was 85.5 and 68.0%, and CT was 0 and 15.1% for G and K, respectively. DMI was similar among treatments (677, 664, 633, and 626 g/d; SE = 30.8) and gross energy (GE) digestibility increased linearly (P < 0.05) with decreasing K (47.1, 51.4, 58.9, and 65.6% for 100K, 67K, 33K, and 0K, respectively). ME intake increased linearly (P < 0.05; 398, 431, 485, and 513 kJ/kg BW**0.75), whereas energy expenditure (356, 350, 399, and 504 kJ/kg BW**0.75) and methane emission changed linearly and quadratically (P < 0.05) with decreasing K (10.9, 13.8, 17.6, and 26.2 L/d; 3.3, 4.0, 5.4, and 8.2% GE; 7.0, 7.7, 8.8, and 11.9% DE for 100K, 67K, 33K, and 0K, respectively). In vitro methane production by incubation of ruminal fluid for 3 wk with a medium for methanogenic bacteria and other conditions promoting activity by methanogens also was affected linearly and quadratically (P < 0.05) by K (7.0, 8.1, 9.2, and 16.1 mL for 100K, 67K, 33K, and 0K, respectively). The total bacterial count was similar among K levels, but the number of total protozoa increased linearly (P < 0.05) as K declined (8.3, 11.8, 15.6, and 27.1 x 10**5/mL for 100K, 67K, 33K, and 0K, respectively). In conclusion, the CT-containing forage K decreased methane emission by goats regardless of nonzero level. The impact of K CT on methane emission appears attributable to changes in methanogenic bacterial activity, although alterations of protozoal actions might be involved as well. This project was supported by USDA Project No. 2004-38814-15045.

Last Modified: 8/24/2016
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