Pine needles? Is it a certain type? Our cows live in pines most of the time and although i've had a handful of stillborn over the past 30 years, most were deformed.
One time we had a dog start showing she was about to deliver a large amount of puppies. The dog was abandoned on the highway. I passed by her every day. People put out scraps for her to eat. I got tired of seeing her sitting there and picked her up. She was blind and almost deaf, had one nonworking gimpy back leg and a broken shoulder. I nursed her back to health and noticed she was pregnant and probably the reason she was dumped. I had to put her in a pen with a bottle calf because being blind, our mule was determined to kill her. One day she started acting weird. I had her in the yard and she'd walk around howling. Long story short, she was rabid, skunk got in the pen with her and the calf... Anyhoot, we took her to the vet to see if they thought she was rabid but she was also so big around, teats dripping milk, back end swollen. By the time we got her to the vet, she was dead. I hoped for a festering mass of dead pups for the reason she died, she was burning up. I did not want it to be rabies. The vet, out of curiosity, cut her open to see if it was infection. He found not one single pup.. uterus was normal and empty.. when it comes to reproductive stuff, weird things happen...