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1 University of Guelph, Guelph, ON, Canada N1G 2W1
2 Provel, Division Eli Lilly Canada Inc., Research Park Centre, Guelph, ON, Canada N1G 4T2
The influence of a monensin controlled-release capsule, which was administered 3 wk before the calving date, on diet digestibility and nitrogen utilization was investigated in 16 multiparous dairy cows between approximately 10 and 3 d precalving and 3 and 9 d post-calving. Monensin decreased rumen ammonia from 5.4 to 3.2 mg dl1 precalving and from 6.0 to 4.9 mg dl1 postcalving. Blood urea concentrations were increased by monensin from 4.93 to 5.28 mM precalving and from 5.27 to 5.81 mM postcalving, but these increases were not statistically significant. Precalving, monensin increased the apparent digestibilities of neutral detergent fiber from 52.8 to 62.1%, of acid detergent fiber from 50.7 to 58.7%, and of gross energy from 60.5 to 66.7%. Postcalving, monensin increased the apparent nitrogen digestibility from 63.7 to 71.5%, which resulted in an improvement in the nitrogen balance from 77.8 to 44.9 g d1. The monensin controlled-release capsule contributed to increasing the availability of dietary nitrogen to the transition dairy cow during the critical postcalving period.
Key Words: transition dairy cow monensin controlled-release capsule digestibility nitrogen balance
Submitted on February 18, 2000
Accepted on June 27, 2000
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