Abstract
Dietary crude protein (CP) reduction is considered a useful strategy to minimize cow N excretion and NH(3) and N(2)O emissions. The aim of the current work was to relate dietary CP modification to whole-animal N balance and subsequent NH(3) and N(2)O concentrations on a tie-stall barn floor. The effect of temperature on NH(3) and N(2)O concentration was also studied. Three Holstein mid to late lactating cows were confined in separate tie-stalls and randomly assigned to 3 diets with varying CP content [low CP (LCP): 14.1%; moderate CP (MCP): 15.9%; high CP (HCP): 16.9%]. Increasing N intake (from 438.6 to 522.8 g of N/d) improved milk yield (from 22.1 to 24.2 kg/d). However, N use efficiency tended to decrease with increasing dietary CP, as shown by milk N use efficiency (from 23.9 to 22.6%), milk urea N (from 15.4 to 18.7 mg/dL), and excreted N per milk yield unit (from 14.7 to 16.4 g of N/kg of milk). Because of higher N excretion, NH(3) concentration on the dairy barn floor increased (LCP: 7.1mg of NH(3)/m(3); MCP: 10.4 mg of NH(3)/m(3); HCP: 10.8 mg of NH(3)/m(3)). In contrast, N(2)O concentration did not respond to dietary manipulation (mean 1.1mg of N(2)O/m(3)). Temperature, which ranged between 12.6 and 18.0 degrees C, di...Continue Reading
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Oct 21, 2014·Global Change Biology·Yong HouOene Oenema
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