|Wells, James - Jim|
Submitted to: Goats International Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 5/28/2008
Publication Date: 9/5/2008
Citation: Puchala, R., Animut, G., Goetsch, A.L., Patra, A.K., Sahlu, T., Varel, V.H., Wells, J. 2008. Ruminal Methane Emissions by Goats Consuming Dry Hay of Condensed Tannin-Containing Lespedeza With or Without Polyethylene Glycol, Alfalfa, or Sorghum-Sudangrass [abstract]. In: Proceedings of 9th International Conference on Goats, Aug. 31 - Sept. 5, 2008, Queretaro, Mexico. Abstract 73, pp. 98-99. Interpretive Summary:
Technical Abstract: Twenty-four yearling Boer x Spanish wethers (initial BW of 37.7 +/- 1.09) were used to assess effects of different sources of dry hay on ruminal methane emission. Treatments were a legume (Sericea lespedeza, Lespedeza cuneata) high in condensed tannins (CT; 15.3%) without (S) or with (P)polyethylene glycol (25 g/d mixed with 50 g/d of ground corn), a legume without appreciable CT (alfalfa, Medicago sativa, 0.2% CT;A), and also a grass low in CT,(sorghum-sudangrass, Sorghum bicolor, 0.2% CT; G). Hay was fed at approximately 1.3 times the maintenance energy requirement. The experiment lasted 15 d, with the first 7 d for adaptation. Intake of DM was 849, 937, 732, and 655 g/day for S, P, A, and G, respectively (SE = 50.5). There were differences (P < 0.05) in OM digestibility (54.5, 60.1, 62.7, and 62.6%; SE = 1.29), digested OM (438, 534, 429, and 378 g/day; SE = 33.7), and energy expenditure (370, 435, 459, and 405 kJ/kg BW**0.75** for S, P, A, and G, respectively; SE = 16.4). Methane emission was 14.3, 19.5, 19.8, and 17.9 l/day for S, P, A, and G, respectively (SE = 1.05), being lowest among treatments for S (P < 0.05). Similarly, methane emission relative to digested OM lowest (P < 0.05) for S (43.5, 55.4, 60.7, and 62.8 l/kg for S, P, A, and G, respectively; SE = 4.17). Treatment differences also existed (P < 0.05) in vitro methane release by ruminal fluid incubated for 3 weeks with conditions promoting activity by methanogens (7.8, 11.7, 13.1, and 13.5 ml for S, P, A, and G, respectively; SE = 1.23). Findings in a previous experiment with fresh forage were similar (15.8, 20.2, 21.3, and 21.6 l of methane/day; 35.2, 45.4, 48.6, and 45.2 l of methane/kg digested OM; 12.9, 21.8, 25.3, and 28.5 ml in vitro methane release for S, P, A, and G, respectively). In summary, effects of CT in S in depressing ruminal methane emission by goats appear similar with dry hay and fresh forage.