Productivity of Commercial Feedlot Beef Production Significantly Improved by Asparagopsis Bioactives Stabilized in Canola Oil  

作　　者：Robert D. Kinley Breanna M. Roque Sigrid L. Mackenzie Marina R. S. Fortes Chiara Palmieri Garth Tarr Holly Cuthbertson Rodney Polkinghorne Frances C. Cowley Robert D. Kinley;Breanna M. Roque;Sigrid L. Mackenzie;Marina R. S. Fortes;Chiara Palmieri;Garth Tarr;Holly Cuthbertson;Rodney Polkinghorne;Frances C. Cowley(FutureFeed Pty Ltd., Townsville, Australia;School of Environmental and Rural Science, The University of New England, Armidale, Australia;School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, Australia;School of Mathematics and Statistics, The University of Sydney, Camperdown, Australia;Birkenwood Pty Ltd., Murrurundi, Australia)

机构地区：[1]FutureFeed Pty Ltd., Townsville, Australia [2]School of Environmental and Rural Science, The University of New England, Armidale, Australia [3]School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, Australia [4]School of Mathematics and Statistics, The University of Sydney, Camperdown, Australia [5]Birkenwood Pty Ltd., Murrurundi, Australia

出　　处：《American Journal of Plant Sciences》2024年第10期899-929,共31页美国植物学期刊（英文）

摘　　要：Research using open-circuit respiration chambers has established that Asparagopsis bioactive compounds stabilized in canola oil (Asp-Oil), delivering a range of inclusion between 34 - 51 mg bromoform (CHBr3)/kg dry matter intake (DMI), inhibits methane (CH4) emissions > 98% in feedlot cattle. In this study, Asp-Oil was fed at 35 mg CHBr3/kg DMI in the feedlot finisher diet under highly replicated and commercially relevant conditions, and adequately powered to confirm differences as low as 3.3% in feed conversion efficiency (FCE). The study also evaluated the effect of Asp-Oil on CH4 production (g/day), carcass and meat-eating qualities, animal health, and food safety. The experiment consisted of 300 Angus-Shorthorn (Bos taurus) steers in 30 pens of 10 and fed a barley-based ration supplemented with canola oil (Control, n = 15), or Asp-Oil (n = 15) for total 81-d, inclusive of 21-d transition to full Asp-Oil and grain inclusion in the finisher ration. Reduction of CH4 was measured using GreenFeed Emissions Monitors (GEM) in a subset of 2 pens in both Control and Asp-Oil. However, 67% of CH4 measurements were recorded below the GEM’s limit of detection. An inhibition range of 58% - 98% was demonstrated by collectively using GEM and preliminary respiration chamber measurements. Asp-Oil improved FCE 7.4% in the finisher diet, and 5.6% across transition and finisher periods. During the transition steps the steers had not yet received their full allocations of grain and Asp-Oil which is responsible for the lower FCE benefits. A 4.1% lower DMI in the finisher period contributed to benefits in FCE with no effect on daily weight gains. Cost of feed and weight gain were reduced $0.35/head/day and $0.23/kg, respectively, in steers receiving Asp-Oil. Residues of Asparagopsis CHBr3 were not detected in any sample and only trace iodide and bromide were detected in livers and kidneys of both Control and Asp-Oil steers at levels safe for human consumption. Steers demonstrated normal rumen development typical of feedlot diets. Research using open-circuit respiration chambers has established that Asparagopsis bioactive compounds stabilized in canola oil (Asp-Oil), delivering a range of inclusion between 34 - 51 mg bromoform (CHBr3)/kg dry matter intake (DMI), inhibits methane (CH4) emissions > 98% in feedlot cattle. In this study, Asp-Oil was fed at 35 mg CHBr3/kg DMI in the feedlot finisher diet under highly replicated and commercially relevant conditions, and adequately powered to confirm differences as low as 3.3% in feed conversion efficiency (FCE). The study also evaluated the effect of Asp-Oil on CH4 production (g/day), carcass and meat-eating qualities, animal health, and food safety. The experiment consisted of 300 Angus-Shorthorn (Bos taurus) steers in 30 pens of 10 and fed a barley-based ration supplemented with canola oil (Control, n = 15), or Asp-Oil (n = 15) for total 81-d, inclusive of 21-d transition to full Asp-Oil and grain inclusion in the finisher ration. Reduction of CH4 was measured using GreenFeed Emissions Monitors (GEM) in a subset of 2 pens in both Control and Asp-Oil. However, 67% of CH4 measurements were recorded below the GEM’s limit of detection. An inhibition range of 58% - 98% was demonstrated by collectively using GEM and preliminary respiration chamber measurements. Asp-Oil improved FCE 7.4% in the finisher diet, and 5.6% across transition and finisher periods. During the transition steps the steers had not yet received their full allocations of grain and Asp-Oil which is responsible for the lower FCE benefits. A 4.1% lower DMI in the finisher period contributed to benefits in FCE with no effect on daily weight gains. Cost of feed and weight gain were reduced $0.35/head/day and $0.23/kg, respectively, in steers receiving Asp-Oil. Residues of Asparagopsis CHBr3 were not detected in any sample and only trace iodide and bromide were detected in livers and kidneys of both Control and Asp-Oil steers at levels safe for human consumption. Steers demonstrated normal rumen development typical of feedlot diets.

关 键 词：Asparagopsis BROMOFORM Enteric Methane Feed Efficiency RUMINANT SEAWEED 

分 类 号：F42[经济管理—产业经济]