Effects of Growth Hormone on Growth Performance, Haematology, Metabolites and Hormones in Iron-Deficient Veal Calves*

摘要: Summary Effects of subcutaneous (s.c.) administration 50 μg/kg body weight recombinant bovine growth hormone (rbGH) or saline were studied for 11 weeks in 40 intact male veal calves supplied mg 10 iron (Fe)/kg milk replacer (MR). Feed intake, average daily gain and growth: feed ratio reduced Fe-deficient calves, but not significantly influenced by rbGH. Plasma Fe haemoglobin concentration, red-cell number packed cell volume decreased (P < 0.05) rbGH further Fedeficient 0.05). The age-dependent increase total binding capacity was greater enhanced urea concentrations increased, whereas glucose (G) triiodothyronine (T3) levels calves. increased G fed MR containing mg/kg insulin (I) IGF-I lower GH the first hours after injections to higher than those Fe/kg MR, incremental changes comparable. In conclusion, low intake caused haematologic, metabolic endocrine changes. IGF-I, I T3 effects on reduced, even though plasma increased.