U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PubAg

Main content area

Whole cottonseed supplementation improves performance and reduced methane emission intensity of grazing beef steers

Author:
M. R. Beck, L. R. Thompson, J. E. White, S. E. Place, C. A. Moffet, S. A. Gunter, R. R. Reuter, G. D. Williams
Source:
Professional animal scientists 2018 v.34 no.4 pp. 339-345
ISSN:
1080-7446
Subject:
automation, body weight changes, cottonseed, diet, emissions factor, forage, grazing intensity, greenhouse gas emissions, methane, methane production, steers, stocker cattle, summer, tallgrass prairies
Abstract:
The objective of this experiment was to determine the effect of level of whole cottonseed (WCS) supplementation on ADG and enteric CH4 emissions of steers grazing tallgrass prairie in the summer. Steers (n = 18; initial BW = 316 ± 23 kg) were trained for 3 wk to use a portable, automated head-chamber system (GreenFeed; C-Lock Inc., Rapid City, SD). Steers were then offered from 0 to 2.9 kg/d (as fed) WCS in individual feeders for 43 d. Body weight was measured weekly before feeding. Total fat concentration of the diet (supplement + forage) at the greatest supplement intake was estimated to be 8.3% of DM. Body weight gain increased linearly as supplement intake increased (P = 0.01). Because of inadequate use of the automated head-chamber system by steers at the 0-kg WCS level, this level was excluded from further analysis. In supplemented steers, there was a tendency (P = 0.1) for a quadratic relationship between CH4 emissions (g/animal per d) and supplement intake, with minimum CH4 at 2.0 kg of supplement (WCS + bait) per day. Emission intensity (g of CH4/kg of BW gain) also responded quadratically (P < 0.004) and was minimized at approximately 2.2 kg of supplement intake per day. The results of this experiment suggest that if WCS supplementation is used to mitigate CH4 emission intensity in stocker cattle grazing tallgrass prairie in the early summer, a dose near 2 kg/d is suggested.
Agid:
6472378
Handle:
10113/6472378