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- W2181882739 abstract "Summary: A series of experiments were performed to measure behavioral and blood cortisol concentration responses of cows exposed to current applied from front to rear hooves. Increased activity level was not a consistent indicator of response to current, whereas a startle response (flinch) was a consistent and repeatable indicator. Cows responded at lower current levels to the 1-front to 2-rear hoof pathway than to muzzle to 4-hooves pathway. Cortisol levels did not increase in response to current exposure at levels up to 1.5 times the behavioral reaction level. Cortisol concentrations were found, however, to increase in response to hoof trimming. It appears for these results that behavioral changes are a more sensitive indicator of response to current than blood cortisol levels. This result agrees with several past studies. Experiments were performed to compare milking performance of cows subjected to electrical current exposure applied during milking to the response to two common milking machine problems. The electrical exposure of one mA, rms of 60 Hz electrical current was applied from front to back hooves during milking. The milking machine problems created were either a pulsation failure (no massage phase) or excessively aged milking machine liners. The response measures included milk yield, average milk flow rate, maximum milk flow rate, cow activity, and strip yield (hand stripping yield). There was no statistically significant main effect on any of these variables for current exposure. Pulsation failure produced a significant decrease in cow activity (5.8 fewer weight shifts during a milking). Aged liners produced a significant effect on milk yield (2.2 kg increase), average flow rate (0.77 kg/min reduction), maximum flow rate (1.2 kg/min reduction) and liner slips (21 more per milking)." @default.
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- W2181882739 date "1999-01-01" @default.
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- W2181882739 title "COMPARISON OF BEHAVIORAL AND PHYSIOLOGICAL RESPONSE TO ELECTRIC SHOCK IN LACTATING DAIRY COWS" @default.
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