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- W1991498669 abstract "Anderson larkspur (Delphinium andersonii A. Gray) is a toxic plant responsible for cattle death losses in the western United States. The objectives of the present study were to determine when cattle consumed Anderson larkspur in relation to plant phenology and toxicity, and to determine if animal age influenced selection of Anderson larkspur. These grazing studies were conducted on semiarid sagebrush rangeland near Picabo, Idaho. Eight 6–7-yr-old mature Angus cows were used in 2008, whereas during 2009, 12 Angus cattle were used, including six yearling heifers and six 4-yr-old cows. The overall density of Anderson larkspur was 2.8 plants · m−2 during 2008, and 4.9 plants · m−2 during 2009. Total toxic alkaloid concentrations in Anderson larkspur plants were near or above 5 mg · g−1 during both studies. During 2008 consumption peaked during the late flower and pod stage of growth. Overall in 2008 cows ate 3% of their bites as larkspur. During 2009 heifers ate about twice as much Anderson larkspur as did mature cows (5.1% of bites vs. 2.9%, respectively). Heifers repeatedly consumed sufficient larkspur that they collapsed; however, no animals were fatally intoxicated. Heifers appeared to become transiently averted to larkspur; however, heifers resumed consumption of D. andersonii after a period of one to several days of low or no consumption. Livestock management to reduce losses to Anderson larkspur should include timed grazing to avoid infested pastures during full flower to pod phenological stages, and grazing with older animals rather than yearling heifers. La hierba Anderson larkspur (Delphinium andersonii A. Gray) es una planta toxica responsable de la perdida de ganado por muerte en el oeste de los Estados Unidos. Los objetivos de este estudio fueron determinar cuando el ganado consume Anderson larkspur en relación a la fenología y toxicidad de la planta, y determinar sí la edad del animal influye en la selección de esta hierba. El estudio se realizo en un pastizal semiárido de artemisa cerca de Picabo, Idaho. Se usaron vacas Angus de ocho, seis a siete años de edad en 2008 mientras que en 2009 se usaron 12 vacas Angus incluyendo seis vaquillas de sobreaño y vacas de seis a cinco años de edad. La densidad total de Anderson larkspur fue de 2.8 plantas por m2 durante el 2008 y de 4.9 plantas por m2 durante 2009. La concentración total de alcaloides tóxicos en las plantas de Anderson larkspur fue cerca o arriba de 5 mg g−1 durante ambos estudios. Durante 2008 el consumo alcanzo su máximo durante la fase tardía de la floración y el crecimiento de las vainas. En general, en 2008 la vacas comieron el 3% de sus mordiscos de la hierba. Durante el 2009 las vaquillas comieron más del doble de la hierba que las vacas adultas (5.1% de mordidas vs. 2.9%, respectivamente). Las vaquillas consumieron de manera consistente suficiente hierba larkspur que se colapsaron, sin embargo, ningún animal se murió por intoxicación. Aparentemente, las vaquillas evitan temporalmente la hierba larkspur pero, inician el consumo de D. andersonii después de un periodo de uno o varios días de bajo o nulo consumo. El manejo del ganado para reducir las pérdidas por Anderson larkspur deberán incluir pastoreo planeado para evitar los porteros infestados del periodo completo de floración al estado fenológico de vainas y pastorear con animales adultos en lugar de vaquillas de sobreaño." @default.
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- W1991498669 date "2011-11-01" @default.
- W1991498669 modified "2023-10-06" @default.
- W1991498669 title "Cattle Grazing Toxic Delphinium andersonii in South-Central Idaho" @default.
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- W1991498669 doi "https://doi.org/10.2111/rem-d-11-00001.1" @default.
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