“…Treat¬ ment of pigs with recombinant DNA-derived human GH (Baile, Delia-Fera & McLaughlin, 1983) or with pituitary-derived porcine GH (Chung, Etherton & Wiggins, 1985;McLaren, Easter, Novakofski et al 1988) increased growth rate. In lambs some studies have shown an effect on weight gain after treatment with pituitary bovine GH (Johnsson, Hart & ButlerHogg, 1985) or with recombinant bovine GH (rbGH) (Pullar, Johnsson & Chadwick, 1986). However, other studies by the same group and others found no sig¬ nificant effect of rbGH on growth rates (Johnsson, Hathorn, Wilde et al 1987;Sinnett-Smith, Woolliams, Warriss & Enser, 1989).…”