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* Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario, Canada NlG2W1,
Department of Animal Science, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2,
Animal Nutrition and Health Department, Animal Biology Division, Scottish Agricultural College, King’s Buildings, West Mains Road, Edinburgh, UK EH9 3JG,
Department of Population Medicine, University of Guelph, Guelph, Ontario, Canada N1G 2W1,
$ Department of Human Biology and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada N1G 2W1
Corresponding author:
B.W. McBride; e-mail
bmcbride{at}uoguelph.ca
Two experiments were conducted to study the effects of a subacute ruminal acidosis (SARA) model on diet choice in dairy cows. In the first experiment, 25% of the ad libitum dry matter intake (DMI) of the total mixed ration (TMR) was replaced with wheat-barley pellets (WBP, 50% ground wheat, 50% ground barley). Rumen pH was measured continuously via in-dwelling probes in 4 mid to late lactation cows. This diet change reduced rumen pH by 0.14 ± 0.02 pH units (mean ± SE) and increased time below pH 6.0, from 319 ± 36 min-1 to 641 ± 36 min-1. Hence, the nutritional model successfully induced SARA. The second experiment determined if inducing SARA increases the feed preference for long alfalfa hay compared with alfalfa pellets. The 2 wk of inducing SARA were separated by 1 control wk. Four cows on either SARA and control diets were given a choice of 2 feeds, 2 times per d, for 30 min. The preference ratios (PR = Amount of Hay consumed/Amount of Hay + Pellets consumed) for alfalfa hay during two SARA weeks was greater (0.85 ± 0.03) compared with the control week (0.60 ± 0.03). In SARA weeks, average rumen pH was 0.23 ± 0.03 units lower, and time below pH 6.0 and 5.6 was higher compared to control. These results suggest that when given a choice of feeds, dairy cows alter their diet selection to attempt to attenuate SARA.
Abbreviation key: PR = preference ratio, SARA = subacute ruminal acidosis, WBP = wheat barley pellets
Key Words: Subacute ruminal acidosis • dairy cow • diet selection
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