| ponderosa pine and broom snakeweed: poisonous plants that affect livestock. | ponderosa pine (pinus ponderosa) and the snakeweeds (gutierrezia sarothrae and g. microcephala) are two groups of range plants that are poisonous to livestock. ponderosa pine causes late-term abortions in cattle, and the snakeweeds are toxic and also cause abortions in cattle, sheep, and goats. research is underway at the usda-ars-poisonous plants research laboratory to better understand livestock poisonings caused by grazing ponderosa pine needles and the snakeweeds and to provide methods of re ... | 1999 | 10091125 |
| conditioning cattle to graze broom snakeweed (gutierrezia sarothrae). | broom snakeweed (gutierrezia sarothrae) is the most widespread range weed in north america. we attempted to positively condition cattle to graze broom snakeweed to create a biological tool to decrease the competitive ability of snakeweed in a plant community. fifteen yearling heifers were divided into three treatment groups receiving different supplements: 1) cornstarch, 2) starch with ground snakeweed, and 3) a control (no supplements). heifers were fed fresh snakeweed, and then were gavaged wi ... | 2004 | 15484964 |
| new antiplasmodial diterpenes from gutierrezia sarothrae. | bioassay guided fractionation of the meoh extract of the plant gutierrezia sarothrae (asteraceae) using an assay for antiplasmodial activity against the drug-resistant dd2 strain of plasmodium falciparum led to the isolation of the two new diterpenes 3α-angeloyloxy-15-hydroxylabda-7,13-dien-16,15-olid-18-oic acid (1) and 3α-angeloyloxy-15-methoxylabda-7,13-dien-16,15-olid-18-oic acid (2). the structures of 1 and 2 were elucidated by interpretation of 1d and 2d nmr spectroscopic data, mass spectr ... | 2016 | 27534100 |