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ABSTRACT
Two studies were conducted to evaluate the effect of preslaughter electrolyte supplementation
on weight loss, hydration, and beef quality of cull dairy cows. Cows were withheld
from feed before slaughter for 36 or 24 h, and ambient temperature ranged from 22
to 32°C or from 12 to 17°C for Exp. 1 and 2, respectively. In Exp. 1, cull dairy cows
(n = 60) were given the control treatment (CON; n = 30) or the on-farm electrolyte
supplementation treatment (PRE; n = 30). Cows on the PRE treatment tended to have
a greater (P = 0.06) decrease in packed cell volume than did CON cows throughout the
preslaughter period. Longissimus samples from PRE cows exhibited greater drip loss
(P = 0.04) and tended (P = 0.06) to have a lower 24-h pH than did samples from CON
cows. In Exp. 2, cull dairy cows (n = 46) were given the CON (n = 16), PRE (n = 16),
or posttransportation electrolyte supplementation treatment (n = 14). Cows on the
PRE treatment tended to have a lower (P = 0.06) percentage of weight loss during transport
than did untreated cows. Results from both experiments demonstrated the potential
for preslaughter electrolyte supplementation to attenuate the negative effects of
stressors on cull dairy cows, but supplementation appears to be more effective during
periods of hot weather and extended feed withdrawal.
Key words
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© 2011 American Registry of Professional Animal Scientists. Published by Elsevier Inc. All rights reserved.
