期刊
SMALL RUMINANT RESEARCH
卷 220, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.smallrumres.2023.106919
关键词
Lamb; Lipids; Tannins; PCA; CH4; Feedlot
The objective of this study was to evaluate the effects of different nutritional strategies on reducing enteric methane emission in feedlot sheep using meta-analytical methods. The results showed that lipid inclusion in diets had the greatest effectiveness in reducing methane emission, followed by tannins. Rumen defaunation and essential oils inclusion had no effect on methane production. Further studies are needed to confirm the effects of saponins and nitrate supplementation on methane emission.
The objective of this study was to use meta-analytical methods to evaluate the effects of nutritional strategies on the reduction of enteric methane emission in feedlot sheep. Additionally, this study aimed to evaluate in-terrelationships among diet composition, intake and digestibility of nutrients, rumen parameters, rumen mi-crobial population, nitrogen metabolism and enteric methane production in sheep. The dataset was composed by 45 peer-reviewed publications with 102 treatment means. The strategies to mitigate enteric methane emission were evaluated by examining the weighted mean difference between control treatment (diets containing no additives and/or any other strategies to mitigate methane emission) and reduced-methane treatment (diets containing strategies to mitigate methane emission: protozoa-free, nitrate, lipids, saponins, essential oils and tannins). The interaction of factors associated with diet composition, nutrient intake and digestibility, rumen parameters on methane emission from sheep depends on how methane production is expressed (Production=CH4 g/d vs Yield= CH4 g/kg DMI). Lipids inclusion to diets reduced methane production in 6.28 g/d and 5.87 g CH4/ kg of DMI. Oil inclusion in amounts greater than 20 g oil/day reduced methane production (CH4 g/d). Lipid inclusion to diets presented the greatest effectiveness in reducing methane emission in sheep fed TMR diets containing different forage: concentrate ratios. Tannins inclusion to diets reduced methane production in 1.22 g/ d CH4 and 2.61 gCH4/kg of DMI, presenting long-term effect on methane emission. Tannins effects on methane production were greater in sheep fed high-forage total mixed rations. Rumen defaunation (protozoa-free) and essential oils inclusion to diets had no effects on methane production. Although methane production reduced with saponin and nitrate inclusion to diets, further studies are needed to confirm their effects on methane emission and better elucidate factors interacting with the response of sheep to saponins and nitrate supplementation.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据