Co-Authors:
Barash, H., Institute of Animal Science, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Aharoni, Y., Institute of Animal Science, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Brosh, A., Institute of Animal Science, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Holzer, Z., Institute of Animal Science, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Abstract:
Holstein bull calves at 138.4 d of age were fed one of four diets that contained 2.28, 2.43, 2.61, or 2.8 Meal of metabolizable energy/kg of dry matter and 10.8, 11.7, 12.8, or 13.9% crude protein, respectively, for 77 d followed by a diet that contained 2.80 Mcal of metabolizable energy/kg of dry matter and 13.9% CP. During the energy restriction period, the metabolizable energy of the diets was positively correlated with the plasma concentration of insulin-like growth factor-I, which was positively correlated with daily body weight (BW) gain during this period and the plasma concentration of total thyroxin. During the first 37 d of the realimentation period, compensatory growth occurred, and the rate of increase in plasma concentrations of insulin-like growth factor-I was positively correlated with that of daily BW gain. At d 37 of the compensatory period, the mean plasma concentration of total thyroxin in calves in three of the four groups did not differ significantly; only the concentration of total thyroxin in the plasma of calves fed the highest energy restricted diet was significantly higher. The mean BW of calves in groups fed the high energy diets during the restriction period tended to be heavier even after 158 d of the realimentation period.
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