We used it this spring for the first time (Long Range). I can say that the immediate results are obvious; the cows have less hair and no flies as of yet. We are also feeding Vitaferm Heat, which helps with flies. The shedding is what amazes me. We are in a hair shedding study with the university extension, and in May have to give scores to all the cows on how much hair they have (for several years). My numbers will be way lower this year (meaning less hair), which is good.
We only used the Long Range in the cows, calves, and two yearling bulls. We DID NOT use it in the show heifer string (mostly fall weanlings and spring yearlings- because we WANT hair on our heifers, lol). In the spring yearlings on pasture, conception does not seem to be an issue (just bred right after injection). I will watch the fall heifers closely when breeding next fall, now I am a bit concerned. I did read on the box AFTER we were done to NOT use it in bulls, so I was a bit worried. However, the April bull we sold to Texas was just tested this morning and passed his BSE with flying colors (he had to be deferred the first test because he had a hair ring on his penis, and after removing it there was blood in the sample so it did not pass).
My vet does not recommend using Long Range in cows, ONLY because people tend to underestimate the weight of their cows, and thus do not give enough which will lead to resistance. We weigh every animal every time they enter the chute, so we know we gave the most accurate dosage. I can say the stuff is THICK!
God, family, and Simmental cattle; that's what makes life worth living!