A regional mass balance model based on total ammoniacal nitrogen for estimating ammonia emissions from beef cattle in Alberta Canada

Chai, Lilong; Kröbel, Roland; Janzen, H. H.; Beauchemin, K. A.; McGinn, S. M.; Bittman, S.; Atia, Atta; Edeogu, I.; Macdonald, Douglas J.; Dong, Ruilan

doi:10.1016/j.atmosenv.2014.04.037

Cited by 19 publications

(12 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…1). The proportion of N excreted (% of N intake) in our study was slightly higher than that (84%) reported by Chai et al (2014) for beef cattle in Alberta. The observed variation between the two studies can be partly attributed to differences in the distribution of various classes of cattle and feed types used in the analyses.…”

Section: N Excretioncontrasting

confidence: 91%

“…Nitrified N was subtracted from the TAN pool. The fraction of TAN immobilized to organic N during manure storage was assumed to be zero (F immob = 0), whereas the organic N fraction mineralized as TAN during manure storage was assumed to be 0.28 for stockpiled manure, and the fraction of TAN nitrified from stockpiled manure was assumed to be 0.14 (Chai et al 2014).…”

Section: Manure Storagementioning

confidence: 99%

“…Emission factors described above were adjusted for temperature based on the Q 10 method (Sheppard and Bittman 2012), wherein the NH 3 emission rates increased 1.5-fold for every 10°C increase above the reference temperature of 15°C and decreased 1.5-fold for every 10°C below this reference temperature. Using this method, we derived period-specific EF based on reported default standard temperature EFs (Sheppard and Bittman 2012;Chai et al 2014).…”

Section: Effect Of Temperature On Nh 3 Emissionmentioning

confidence: 99%

“…The observed variation between the two studies can be partly attributed to differences in the distribution of various classes of cattle and feed types used in the analyses. Chai et al (2014) used a TAN-based model to specifically quantify NH 3 emissions from beef cattle in Alberta, while we followed a nation-wide industry level approach taking into account regional differences in feed types, feeding systems, and cattle categories. Mature cows accounted for approximately half of the total N excretion in both production years, whereas slaughter cattle (i.e., backgrounding and finishing cattle) contributed 24% and 28% of the total N excreted in 1981 and 2011, respectively.…”

Section: N Excretionmentioning

confidence: 99%

“…In 2014, agriculture was responsible for about 93% of the total anthropogenic NH 3 emissions in Canada (Environment and Climate Change Canada 2016). In 2011, NH 3 emissions from livestock represented 65% of total Canadian agricultural NH 3 emissions (Sheppard and Bittman 2016), with the beef sector being the major contributor from livestock (Carew 2010;Chai et al 2014). If livestock are provided with diets that exceed nitrogen (N) requirements, the N that is not retained is excreted in the urine and feces (Casey et al 2006).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Effect of changes in management practices and animal performance on ammonia emissions from Canadian beef production in 1981 as compared with 2011

et al. 2018

Self Cite

View full text Add to dashboard Cite

The present study compared ammonia (NH3) emissions from Canadian beef production in 1981–2011. Temporal and regional differences in cattle categories, feed types and management systems, average daily gains, carcass weights, and manure handling practices were considered. A scenario-based sensitivity analysis in 2011 estimated the impact of substituting corn dried distillers’ grains with solubles (DDGS) for grain in feedlot diets. On average, 22% of the total nitrogen (N) intake was lost as ammoniacal nitrogen (NH3-N) in both years. Manure emission sources were consistent across years, averaging 12%, 40%, 28%, and 21% for grazing, confinement, storage, and land spreading, respectively. Emissions per animal in 1981 and 2011 were 16.0 and 18.4 kg NH3 animal−1 yr−1, respectively. On an intensity basis, kilogram of NH3 emitted per kilogram of beef decreased 20%, from 0.17 in 1981 to 0.14 in 2011. This reduction was attributed to increases in reproductive efficiency, average daily gain and carcass weight, and improved breeding herd productivity. In 2011, substituting DDGS for grain in feedlot diets increased total NH3 emissions and losses per animal. Although addition of by-products from the bioethanol industry can lower diet costs, it will be at the expense of an increase in NH3 emissions.

show abstract

Section: N Excretioncontrasting

confidence: 91%

Section: Manure Storagementioning

confidence: 99%

Section: Effect Of Temperature On Nh 3 Emissionmentioning

confidence: 99%

Section: N Excretionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations