Objectives—To determine maintenance energy
requirements and effect of diet on performance of
Animals—7 adult racing Greyhounds.
Procedure—Dogs were fed a higher fat and protein
(HFP) or a lower fat and protein (LFP) diet for 8 weeks
in a crossover design. Dogs were exercised for 15
minutes twice daily in a paddock and raced 500 m
twice weekly. Blood gas, hematologic, and serum biochemical
analyses were performed before and after
racing, and race times were compared at the end of
each diet period.
Results—Mean race time was significantly shorter
(32.81± 0.65 seconds vs 33.05 ± 0.71 seconds), and
mean racing speed over 500 m was significantly
faster (15.25 ± 0.30 vs 15.13 ± 0.30 m·s–1) when dogs
were fed the HFP diet than when they were fed the
LFP diet. Diet had little or no effect on results of blood
gas, hematologic, and serum biochemical analyses,
except that Hct was 4% greater before and after racing
when the HFP diet was fed than when the LFP
diet was fed. Mean SD metabolizable energy intake
from weeks 1 through 16 was 155 ± 9 kcal·kg–0.75·d–1.
Conclusions and Clinical Relevance—Racing
Greyhounds ran faster when fed a diet containing
higher fat and protein and lower carbohydrate contents.
Their maintenance metabolizable energy
requirement was slightly higher than that of moderately
active dogs. (Am J Vet Res 2000;61:1566–1573)