Effect of Cation-Anion Difference on Measures of Acid-Base Physiology in Beef Cows1
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چکیده
Twenty-four mature, nonpregnant crossbred cows were used in a 42-d feeding study to evaluate the effects of dietary cation-anion difference (DCAD) on performance, dry matter intake, and pH of blood, urine, and uterine flushing. All cows were housed individually and provided free-choice access to bahiagrass hay and a corncottonseed meal supplement. Two treatments were randomly allocated to cows to create a negative and positive DCAD. Treatment DCAD differences were created by the inclusion Chloride and Sodium sources into the daily supplement. Effects of treatment on cow acid/base balance were determined by the measurement of blood, urine, and uterine flush fluid pH on d 0, 21, and 42. Final cow body weight and average daily gain was not different among treatments. On d 21 and 42, blood pH was less for low vs high DCAD cows. Similarly, urine pH was less on d 21 and 42 for low vs high DCAD cows. The pH of uterine flush fluid tended to be less on d 21 (6.41 vs 6.22) and d 42 (6.39 vs 6.13) for low vs high DCAD cows. Hay dry matter intake did not differ among treatments in period 1, but was less for low vs high DCAD cows in period 3. These data suggest that differences in DCAD will alter acid-base physiology in beef cows. Altering pH of the uterine environment may affect reproductive success of the beef cow and should be investigated further.
منابع مشابه
Effect of dietary cation-anion difference on measures of acid-base physiology and performance in beef cattle.
Dietary constituents can affect cow acid-base physiology and uterine pH. Dietary cation-anion difference (DCAD) has been shown to affect cow acid-base physiology, but the effect on uterine pH has not been demonstrated. The objective of this work was to determine if DCAD [(Na + K + 0.15Ca + 0.15Mg) - (Cl + 0.60S + 0.50P)] could affect cow DMI, acid-base physiology, and uterine pH, and second, to...
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