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Two experiments were completed to: (1) identify predictive acid-base and electrolyte parameters that might be correlated with meat quality in marketed bulls; and (2) to determine whether bulls could be treated with either glucose or electrolyte drinks while in lairage to improve electrolyte balance and meat quality. In the first experiment, 29 crossbred yearling bulls averaging 499 ± 13.4 kg were exposed to either a minimal stress of no mixing and 3 km transport (N = 13) or a moderate stress of mixing, 6 h transport 24 h off feed in lairage, plus an additional 3 km transport immediately prior to slaughter (N = 16). Animals exposed to moderate stress displayed higher serum chloride values (137 mmol L −1 ) compared to pre treatment control (121 mmol L −1 ) or minimal stress values (118 mmol L −1 ) (P ≤ 0.01). The moderate stress group also displayed lower blood hydrogen ion concentrations (P &lt; 0.05) and produced a high frequency of dark, firm and dry meat (9 out of 16 animals compared to 0 out of 13 in the control group). In the second experiment, 79 crossbred yearling bulls averaging 595 ± 6.5 kg were divided into treatment groups of either 19 or 20 animals each and subjected to mixing, handling and a 6-h transport period after which they were left in lairage for 18–20 h before slaughter. Treatment groups were: (1) no water during lairage; (2) water only; (3) electrolyte drink; or (4) a 5% glucose drink. Animals in exp. 2 given either water or no water displayed significantly higher serum sodium (P ≤ 0.01) and chloride ion (P ≤ 0.02) levels compared to animals offered an electrolyte or glucose drink. It was also found that the urine cation levels of animals offered no water or water only were significantly higher (P ≤ 0.05). In all animals, improved electrolyte balance coincided with improved meat quality traits and carcass yield. Key words: Electrolyte balance, transport stress, bulls, carcass quality

EFFECTS OF TRANSPORT AND ELECTROLYTE SUPPLEMENTATION ON ION CONCENTRATIONS, CARCASS YIELD AND QUALITY IN BULLS