Is Milkweed, fatal to mature beef cows?
Hay was round baled in June and does contain milkweed.
We switched them to Alfalfa today.
Looks like it could be.
Region: Central Texas
Posted: December 23, 1998
Horsetail milkweed toxicity in a horse:
"A 7-year-old gelding was anorectic for 8 hrs prior to acute onset of
ataxia. A stable mate had died 24 hrs previously. Evaluation of the stable
environment revealed a plant other than alfalfa present in the hay left in
the feed box. The hay trash was submitted for plant identification, along
with reflux from the gelding. Both contained fragments of horsetail
milkweed (Asclepias subverticillata) also called western worled milkweed,
which contains a neurotoxic cardenolide ( pregnane glycoside)"
Anthony R. Brach
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Update: June 2012