Artificial Insemination (AI) and estrus synchronization are pushing beef producers Terry Slusher of Floyd, Va.

Many parts of it read like pages from the hospital records of a delicate, but very disturbed patient: N was repeatedly knocked prostrate by changes in the weather, by too-bright sunshine and thunderstorms, by the sirocco in southern Italy and freezing rain in Switzerland, by airless, low-ceilinged rooms and primitive railroad cars, by publishing snafus and lost luggage, by the estrus of composition and the wall of incomprehension it ran into.

Ovariectomized steroid-primed Sprague-Dawley female rats were used as stimulus animals and were brought into behavioral estrus by a subcutaneous priming injection of 2 [micro]g estradiol benzoate in sesame oil 48 hr before receiving 100 [micro]g progesterone (subcutaneously), as previously described (Markaverich et al.