An Evaluation of the Toxic Norditerpenoid Alkaloid Content Across Delphinium Species, and Their Acute Toxicities in a Murine Model.

Larkspurs (Delphinium spp.) are one of the most problematic plants for cattle producers in North America. Previous research has shown that there is a difference in the alkaloid composition between different species of larkspurs, and between different populations of the same species.

Comparison of the acute toxicity of zygacine versus zygadenine.

Foothill death camas (Zigadenus paniculatus) is a common poisonous plant found throughout western North America. The toxic alkaloids in foothill death camas are zygadenine, esters of zygadenine, with zygacine, the 3-acetyl ester of zygadenine, often being the most abundant. Two additional esters of zygadenine that are found primarily in the floral parts of foothill death camas are 3-angeloylzygadenine and 3-veratroylzygadeine.

Lupine-induced crooked calf syndrome: mitigation through intermittent grazing management of cattle.

Lupines are responsible for a condition in cattle referred to as "crooked calf syndrome" (CCS) that occurs when pregnant cattle graze teratogenic lupines. A proposed management strategy to limit these types of birth defects includes utilizing an intermittent grazing schedule to allow short durations of grazing lupine-infested areas interrupted by movement to a lupine-free pasture. The objective of this study was to determine if an intermittent schedule of ten continuous days of lupine treatment followed by 5 d off treatment would be sufficient to decrease, or prevent, the incidence of lupine-induced malformations.

Animal and plant factors which affect larkspur toxicosis in cattle: Sex, age, breed, and plant chemotype.

Larkspur (Delphinium spp.) poisoning is a long-term problem for cattle grazing on rangelands of western North America. Recent research has shown that both plant and animal-based factors are critical in understanding and mitigating larkspur poisoning in cattle.

Sex-dependent differences for larkspur (Delphinium barbeyi) toxicosis in yearling Angus cattle1.

Larkspur (Delphinium spp.) poisoning is a long-term problem for cattle grazing on rangelands of western North America. Results from preliminary experiments have suggested that differences in larkspur toxicity may exist between heifers and bulls.

The effect of western juniper on the estrous cycle in beef cattle.

Numerous evergreen trees and shrubs contain labdane acids, including isocupressic acid, which can cause late-term abortions in cattle. Recent research has shown that the bark from western juniper trees can also cause late-term abortions in cattle. Additionally, ranchers have observed that cattle in western juniper-infested rangelands tend to have decreased conception rates.

Alkaloid Profiling as an Approach to Differentiate Lupinus garfieldensis, Lupinus sabinianus and Lupinus sericeus.

Introduction: Many species in the Lupinus genus are poorly defined morphologically, potentially resulting in improper taxonomic identification. Lupine species may contain quinolizidine and/or piperidine alkaloids that can be acutely toxic and/or teratogenic, the latter resulting in crooked calf disease.

Objective: To identify characteristic alkaloid profiles of Lupinus sabinianus, L.