“…Many of the anabolic effects of estrogens and somatotropin are similar in growing cattle and sheep (e.g., improved daily gain and feed conversion, decreased urinary N, plasma urea N (PUN) and amino acid N, increased N retention and lean tissue deposition) (Oltjen and Lehmann, 1968;Preston, 1968Preston, , 1975Preston, , 1987Davis et al, 1970a,b;Grebing et al, 1970;Trenkle and Topel, 1978;Heitzman, 1979;Goldberg et al, 1980;Buttery, 1983; Accepted May 23. 1990.…”