E de la Garza Institute for Goat Research Langston University
Workshops & Field Day Newsletter Newsletter Subscription Demonstrations Demonstrations Langston University Research Building
Goat Menu
 

extension
extension
research
other
library
quiz
search
about
contact
faculty

bar

 

Methane emission by goats consuming diets with different levels of condensed tannins from lespedeza

Animut, G., R. Puchala, A. K. Patra, T. Sahlu, V. H. Varel, J. Wells, and A. L. Goetsch

Animal Feed Science and Technology. In Press. 2008

Twenty-four yearling Boer Spanish wethers (7/8 Boer; initial body weight (BW) of 34.1 1.02 kg) were used to determine effects on methane (CH4) emission of dietary levels of a condensed tannin (CT)-containing forage, Kobe lespedeza (Lespedeza striata; K), and a forage very low in CT, sorghum-sudangrass (Sorghum bicolor; G). Treatments were dietary K levels (dry matter (DM) basis) of 1.00, 0.67, 0.33, and 0 (100K, 67K, 33K, and 0K, respectively). Forages were harvested daily and fed at approximately 1.3 times maintenance metabolizable energy requirement. The experiment lasted 21 days, with most measures on the last 8 days. The CT concentration was 0.3 and 151 g/kg DM in G and K, respectively. DM intake was similar among treatments (i.e., 682, 675, 654, and 648 g/day; SE = 30.0) and gross energy (GE) digestibility increased linearly (P < 0.05) with decreasing K (0.472, 0.522, 0.606, and 0.666 for 100K, 67K, 33K, and 0K, respectively). CH4 emission changed quadratically (P < 0.05) with decreasing K (10.9, 13.8, 17.6, and 26.2 l/day; 32, 42, 57, and 88 kJ/MJ GE; 69, 81, 94, and 133 kJ/MJ digestible energy for 100K, 67K, 33K, and 0K, respectively). In vitro CH4 emission by incubation of ruminal fluid for 3 weeks with a medium for methanogenic bacteria and other conditions promoting activity by methanogens also was affected quadratically (P < 0.05) by K level (7.0, 8.1, 9.2, and 16.1 ml for 100K, 67K, 33K, and 0K, respectively). The total bacterial count of ruminal samples 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 105/ml for 100K, 67K, 33K, and 0K, respectively). The CT-containing forage K decreased CH4 emission by goats regardless of its feeding level, although the effect per unit of K increased with decreasing K. Forage type (i.e., legume vesus grass) may have contributed to the effect of K on CH4 emission, but most of the change appeared attributable to CT, which appeared to directly impact activity of methanogenic bacteria, although alterations of protozoal activity could have been involved. These findings suggest that relatively low dietary levels of CT could be employed to lessen CH4 emission without a marked detrimental effect on other conditions such as total tract protein digestion.


 

Extension Activities   |   Research Activities   |   Other Activities
Library Activities   |   Quiz   |   Search   |   About Us   |   Contact Us   |   Faculty & Staff
Research Extension Home   |   Top of Page

Copyright© 2000 Langston University   • Agricultural Research and Extension Programs
P.O. Box 730  • Langston, OK  73050 • Phone 405.466.3836