Only a day behind now, so I am going to bed

Sorry guys wrote a book I think!
Have had a lot go on here lately. Lots of good, some very bad... no predators but a stupid, ignorant mistake on my part.
I am posting this to hope no one goes through this experience, its just ripped my heart right out.
DD and I cut the "uglybush" down to a manageable size fighting my dad the entire time.
It was a huge nasty evergreen type bush, overtaking one side of the house!
I think at one time it was an ornamental hedge type, now its ugly, embarrassing, harbored bees and needed to go.
Its become a haven for sparrows. I found out what the thing is, Japanese Yew.
Well.. I had a wagon load in my trailer, on the little tractor. Been hauling it to the big burn pile at the back of the property.
Parked the tractor next to the cow/goat pasture because a state cop came in. The path to the burn pile runs by their pasture.
Someones boat was stolen! We don't have those problems here, very upsetting.
Told DH to stop at the neighbors house this weekend to find out more, it was a small aluminum jon boat..
Anyways, I spoke with the Officer a good 20 minutes or so, turned around to finish taking the load to the burn pile.
My girls and baby moo were eating the stuff! OH NO! So I ran and pulled all the branches away from them.
Stupid

My baby cow was poisoned. He was dead the following day. I was just bawling like a baby over it.
Yes, he was meant for food. But still a baby, just a few hundred pounds at most, and would have been here several months before that bad day.
I asked Jack the neighbor north of us to please come, he came that evening and took some of the plant to his vet.
He has had cattle at least 60 years, his entire life and knows his stuff. Yup, sure enough it was this horrible plant.
Thank goodness, my girls are fine, and Bocephus is not in with the Sugar and Sophie. Painful lesson learned.
My girls only get hay and a cup of grain a day, Bo tethers out with me and eats weeds and grasses.
I have asked Jack to please talk more with his vet, and pass my phone # to her so I can look into this more. Concerned about my girls.