疯草放牧。

Journal of natural toxins Pub Date : 1999-02-01
M H Ralphs, L F James
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引用次数: 0

摘要

麻草是美国西部最普遍存在的有毒植物问题。11种黄芪和棘豆(以及这些物种中的许多品种)引起麻草中毒。许多loloweed物种是地方性的,并且局限于狭窄的生态位或栖息地。其他麻草种类经历极端的种群周期;它们的数量在湿润的年份激增,在干旱的年份死亡。少数种类,如绢金虫,相对稳定,引起持续的中毒问题。了解lolograss生长的地方以及它们成为威胁时的环境条件对于管理牲畜和避免中毒非常重要。野草相对来说是可口的。许多野草是第一批在春天开始生长,在秋天重新生长的植物。牲畜通常更喜欢绿色生长的土豆泥,而不是在深秋、冬季和春季休眠的其他牧草。最有效的管理策略是在关键时期,当草比相关牧草更可口时,不让牲畜接触草。除草剂可以控制现有的野草数量,并在关键时期提供“安全”的牧场。然而,当环境条件有利时,土壤中的马齿苋种子会发芽和重建。良好的牧场管理和明智的放牧策略可以为牲畜提供充足的饲料,并防止它们在一年中的非关键时期食用草草,因为草草比相关的牧草相对不那么美味。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Locoweed grazing.

Locoweed is the most widespread poisonous plant problem in the western U. S. Eleven species of Astragalus and Oxytropis (and many varieties within these species) cause locoism. Many locoweed species are endemic and are restricted to a narrow niche or habitat. Other locoweed species experience extreme population cycles; the population explodes in wet years and dies off in drought. A few species, such as O. sericea, are relatively stable and cause persistent poisoning problems. Knowledge of where locoweeds grow and the environmental conditions when they become a threat is important to manage livestock and avoid poisoning. Locoweeds are relatively palatable. Many locoweeds are the first plants to begin growth in the spring and regrow in the fall. Livestock generally prefer the green-growing locoweeds to other forage that is dormant in the late fall, winter, and spring. The most effective management strategy is to deny livestock access to locoweeds during critical periods when they are more palatable than the associated forage. Herbicides can control existing locoweed populations and provide "safe" pastures for critical periods. However, locoweed seed in soil will germinate and re-establish when environmental condition are favorable. Good range management and wise grazing strategies can provide adequate forage for livestock and prevent them from grazing locoweed during non-critical periods of the year when it is relatively less palatable than associated forages.

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