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1 Energy Metabolism Unit, Nutrient Conservation and Metabolism Laboratory, Livestock and Poultry Sciences Institute, USDA, Agricultural Research Service, Beltsville, MD 20705
2 US Dairy Forage Research Center, USDA, Agricultural Research Service, Madison, WI 53706
Ruminants are one of many sources contributing to atmospheric methane. The accuracy of seven published equations for methane prediction was evaluated using a data file consisting of 16 experiments (602 observations). Methane energy emissions ranged from .89 to 7.21 Mcal/d for Holstein cows. The DMI ranged from 9.7 to 28.7 kg/d for lactating cows and 4.0 to 12.9 kg/d for nonlactating cows. Mean dietary concentrations of ADF, CP, and ether extract were similar for lactating and nonlactating cows versus 21.2, 15.7, and 2.9% for nonlactating cows, respectively). Milk production ranged from 2.7 to 55.9 kg/d. Prediction equations were ranked by correlation coefficients and error of prediction. Prediction of methane energy loss from lactating and nonlactating Holstein cows with equations based on the daily total intake or intake of digested cellulose, hemicellulose, and nonfiber carbohydrates (OM - NDF - CP - ether extract) provided the highest correlation coefficients for reproducibility and the lower errors of prediction. Predictions were poor for lactating cows when a quadratic function of DMI was used. In general, equations estimated methane production more accurately and precisely for nonlactating than for lactating cows.
Key Words: methane • cattle • environment • energy loss
Submitted on December 22, 1994
Accepted on June 20, 1995
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