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less teed to keep a cow in good condition, he noted. In addition, said Bibb, internal parasites can do permanent damage to an (animal’s intestinal tract, causing nodules, scars and scar tissue that interfere with digestion.
It doesn’t make any difference what kind of wormer a farmer uses, said Bibb. All are effective. The form of the wormer—drench, pill, paste, feed or subcutaneous injection—has no bearing on its effectiveness as long as it gets into the cow. “It's probably a good idea to rotate wormers in the spring and fall,” Bibb suggested. "It keeps the parasite guessing.”
Worming in the spring does not cause cows to abort. Bibb maintained. “If you lose calves, it’s not the fault of the worm medicine” but instead, is due to roagtk/tandling of cows heavy with/calf. He advised using wormer added to feed for pregnant cows.
Dollar Value
“I don’t know if I’d worm feeder calves right before they’re weaned if they’re going to be sold two weeks later,” Bibb commented. “You won’t get the value of worming.” The same thing, he said, applies to vaccinations. Stock sold at feeder sales must be innoculated against blackleg and malignant edema but otherwise, Bibb advised farmers only to vaccinate for the diseases that their feeder calf association requires. “If you spend a dollar, you’ve got to be sure you’re going to get a dollar back.” he concluded.
Calves that a farmer plans to keep are another matter. Three weeks to a month prior
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