We investigated the effect of an immune response, following injection with sheep red blood cells (SRBC) in pullets, on energy balance characteristics and on protein and far gain. Controls were sham-immunized with phosphate buffered saline (PBS). Feed intake, body weight, rate of gain, and metabolizability of gross energy were not significantly (P greater than .10) affected by SRBC-immunization. The magnitude and composition of energy gain were influenced by SRBC-immunization. The SRBC-immunized pullets retained significantly (P less than .01) more energy, deposited significantly (P less than .05) more fat, and had a significantly (P less than .01) lower maintenance requirement of metabolizable energy than PBS-injected pullets during days 1 to 5 after injection. During days 6 to 10 after injection, SRBC-immunized pullets deposited significantly (P less than .05) less fat and significantly (P less than .10) more protein than PBS-injected pullets. Effects of vaccination on metabolic rate and performance characteristics may be comparable with these effects of SRBC-immunization.
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Henken et al. (1982) studied this question.
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