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Preparation of teaser bulls and steroid implanted steers and their effectiveness in detecting estrus

, : Preparation of teaser bulls and steroid implanted steers and their effectiveness in detecting estrus. Theriogenology 6(1): 51-60

Pen-O-Blocks were easily installed in 15 bulls, Libido appeared to be unaffected. With the exception of 1 bull, infections occurred, or the penis bypassed the block, or the pin broke, and in 14 tests the Pen-O-Blocks were removed within 5 wk of installation. Recovery from infection following removal of the device was rapid and uneventful. Eight bulls had their penes deviated between 2 wk 4 mo. of age. Four of these also were castrated and implanted with androgens at 12 mo. of age. Semen quality and libido in the deviated bulls were normal. Bulls and steers were equipped with Chin Ball mating devices. Bulls generally were more effective than steers in detecting estrus. When placed in pens 24 h/day with 20 heifers each, 1 bull detected 97% and another bull detected 100% of the potential estruses during a period of 2 mo. An observer watching for .5 h each morning and each late afternoon detected 74%. While steers were less efective, they were more docile than the bulls. With selection of active animals and adjustment of hormone therapy, implanted steers may be successfu detectors of estrus with minimal danger to the owner. Reproductive development in the androgen-treated steers was delayed but maturation of the penis had occurred in steers slaughtered at 31 mo. of age. Body weight gains of steers tended to be accelerated during periods when they had implants.

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