“…This contrasts with the situation when MGA alone is used to synchronize heat (Zimbelman, Lauderdale, Sokolowski & Schalk, 1970). Others have also found that HCG reduces the incidence of heat in cattle when given in conjunction with progestagens (Mauléon, Rey, Mariana & Benoit, 1970;Roche & Crowley, 1972) or when given alone for treatment of ovarian hypoplasia (Nakahara, Domeki & Yamauchi, 1970).…”