Atzori, Alberto Stanislao and Boe, Roberta and Carta, Patrizia and Fenu, Antonio and Spanu, Gesumino and Francesconi, Ana Helena Dias and Cannas, Antonello (2009) Estimation of nitrogen volatilisation in the bedded-pack of dairy cow barns. Italian Journal of Animal Science, Vol. 8 (Suppl. 2), p. 253-255. eISSN 1828-051X. Article.
The objective of the study was to measure N volatilisation (NVOL) from bedded-pack dairy cow barns. Feed intake, milk production, bedding material used and meteorological variables were monitored in 3 dairy farms near the town of Arborea (39°46’26” N, 08°34’53” E, 7 m a.s.l.) during one month for each season from summer 2007 to spring 2008. NVOL was measured in the interval between excretion and removal of bedded-packs from barn floors. NVOL was measured using the N (nitrogen) to P (phosphorus) ratio marker method, considering P as an internal non-volatile marker in milk and manure. Nitrogen and P excretion was estimated by nutrient balance as intake minus N and P excreted in milk. NVOL coefficient and bad-pack temperature were almost constant among seasons. The annual mean NVOL in bedded-pack barns was equal to 38.8% of excreted N. Accounting also for the NVOL that occurred in the concrete floor of the feeding and walking areas of the barns, NVOL was 40.7% of N excreted.
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