Merino Ewes Overcome Bromoform Feed Refusal After 31-Day Transition Period
Sheep gradually introduced to bromoform-based methane-curbing supplements return to normal dry matter intake levels after 31 days, according to new Tasmanian research published in CSIRO’s journal Animal Production Science. The work by researchers from the Tasmanian Institute of Agriculture addresses a significant hurdle identified in earlier studies, which recorded notably lower dry matter intake in sheep fed asparagopsis and other bromoform-based feed additives.
The research team tested 28 Merino ewes eating a high-forage diet, using pelleted supplements ranging from 8.3 to 16.6 milligrams per head per day for 31 days. Following that initial phase, the animals received 24.9 to 33.12 milligrams per head per day for another 16 days. The scientists observed up to a 16 percent variation in dry matter intake levels when they combined the supplements with rumen modifiers such as grape marc or biochar.
Rumen Modifiers and Weight Gain Results Recorded in Tasmanian Trial
Co-supplementation with rumen modifiers minimized some of the negative impacts associated with high bromoform concentrations. The slow transition period using only a bromoform-based supplement actually increased weight gain in the Merino ewes.
Research lead Dr Ibrahim Ahmad noted that while bromoform-based feeds show remarkable efficacy in reducing enteric methane emissions from ruminants, past studies highlighted detrimental effects on overall animal performance. Understanding how these supplements alter feed intake remains crucial for practical implementation in livestock production systems, according to Dr Ahmad.
Future Emissions Testing and Funding Sources Supporting the Study
The Tasmanian Institute of Agriculture team did not measure actual methane output during this specific trial. The researchers suggested that direct emissions measurements be included in future studies to fully quantify the environmental benefits alongside feed intake metrics.
The Tasmania Agricultural Development Fund, based in Hobart, supported the research project. Dr Ahmad also received a grant through a top-up stipend from the Tim Healey Memorial Scholarship, which the A. W. Howard Memorial Trust awards to recognize contributions to sustainable Australian agriculture. The study team included Richard Rawnsley, John Bowman, James Hills, Orlin Todorov, and Apeh Omode.
Frequently Asked Questions About Bromoform Sheep Supplements
How long did it take for the Merino ewes to return to normal feed intake?
The 28 Merino ewes in the Tasmanian Institute of Agriculture study returned to normal dry matter intake levels after 31 days of gradual introduction.
What specific rumen modifiers were used alongside the supplements?
The researchers added grape marc and biochar as rumen modifiers to help minimize the negative impacts of high bromoform concentrations.
Where was the research published and who funded it?
The findings appeared in CSIRO’s journal Animal Production Science, with financial support from the Tasmania Agricultural Development Fund in Hobart and the Tim Healey Memorial Scholarship.