Development of prediction models for quantification of total methane emission from enteric fermentation of young Holstein cattle at various ages

Jiao, Haopeng; Yan, Tianhai; Wills, David; Carson, A. F.; McDowell, D.A.

doi:10.1016/j.agee.2013.11.004

Cited by 34 publications

(25 citation statements)

References 15 publications

(31 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In more recent chamber studies, Jiao et al (2013) found that irrespective of gender, CH 4 emissions from Holstein heifers (i.e. 6 months old) represented~10% of the daily MEI, whereas Jiao et al (2014) confirmed this fermentation pattern on the same dairy breed and gender up to~22 months of age. Therefore, it is logical to assume that differences between the previous research and our daily losses of MEI (13.9 AE 0.24%) with Friesian · Jersey heifers are probably due to differences in dietary forage proportions and feeding levels.…”

Section: Discussionmentioning

confidence: 93%

Methane emissions from young and mature dairy cattle

2016

View full text Add to dashboard Cite

Daily methane (CH 4 ) emissions (g) and CH 4 yield (g/kg dry matter intake) were measured from 10 dairy heifers (<1 year old) and nine rumen-fistulated cows (>6 years old) fed ryegrass (Lolium perenne) chaffage indoors. The CH 4 emissions were estimated using the sulfur hexafluoride tracer technique in four~5-day periods beginning in June 2008 and repeated 4, 6 and 7 months later. Respiratory chambers were used in four~13-day periods beginning in November 2008 and repeated 2, 5 and 6 months later. Third and fourth sulfur hexafluoride tracer periods overlapped with the first and second chamber measurement periods, respectively. Averaged over the four measurement periods the CH 4 yields determined using both techniques were similar for heifers and cows. The mean CH 4 yield estimated by the sulfur hexafluoride tracer technique was 25.3 AE 0.52 for heifers and 24.1 AE 0.55 for mature cows, whereas the mean CH 4 yield measured in respiratory chambers was 23.7 AE 0.66 for heifers and 23.6 AE 0.66 for mature cows. Averaged over the eight measurements irrespective of technique, CH 4 yields for heifers (24.5 AE 0.42) and cows (23.8 AE 0.43) were similar. There was also no difference between CH 4 methods for assessing CH 4 yield during the overlapping measurement periods. It was concluded that no consistent differences in CH 4 yield existed between heifers and mature cows. Therefore, we do not recommend adoption of an age-related emission factor for cattle in the national inventory calculations for New Zealand.

show abstract

Section: Discussionmentioning

confidence: 93%

Methane emissions from young and mature dairy cattle

2016

View full text Add to dashboard Cite

show abstract

“…Além disso, a atividade agropecuária é uma das principais contribuintes para o acúmulo de CH 4 na atmosfera, devido a fermentação entérica do animal (Jiao et al, 2014;Hammond et al, 2016), que é a maior fonte de emissão do gás nesse setor, no Brasil (Cerri et al, 2016).…”

Section: Introductionunclassified

Balanço de Carbono – Viabilidade Econômica de Dois Sistemas Agroflorestais em Viçosa, MG

et al. 2017

View full text Add to dashboard Cite

RESUMOA carência de estudos sobre o balanço de carbono e viabilidade econômica em sistemas agroflorestais (SAF) motivaram este estudo. Foram avaliados um sistema agrissilvipastoril (SASP) composto por eucalipto, feijão e capim braquiária e um sistema silvipastoril (SSP) composto por eucalipto e capim braquiária, ambos aos 3 anos de idade. Para estimar a biomassa do componente arbóreo foi utilizado o método indireto e para a gramínea, o direto. As emissões de gases de efeito estufa (GEE) foram baseadas no guia de Inventários Nacionais de GEE. Carbon Balance and Economic Viability in Two Agroforestry Systems inViçosa, MG ABSTRACTThe lack of studies on carbon balance and economic viability in Agroforestry Systems (AFS) motivated this study. We evaluated an agrosilvopastoral system (SASP), composed of Eucalypt, beans and Brachiaria-grass; and a silvopastoral system (SSP), composed of Eucalypt and Brachiariagrass, both 3 years old. The tree biomass was estimated using the indirect method and the direct method was used to quantify the grass biomass. Greenhouse gas (GHG) emissions were based on the National Inventory tab of GHGs. The Net Present Value (NPV) and Internal Rate of Return (IRR) were calculated. Both systems had a positive carbon balance. The NPV in the SASP was $388.77 and the IRR was 21%. The positive results were due to revenue generated by the sale of beans. The SSP NPV was -$ 1,298.00 and the IRR of -2%, considering the 3 years old trees cutting.

show abstract

“…However, the relationship between rumen methanogens and CH 4 is unclear, with previous work finding weak to no correlation between absolute methanogen abundance and CH 4 production in adult cattle. Moreover, little to no work has considered the methanogenic output of heifers, even though these animals produce more CH 4 per unit feed intake than older, lactating cows . Here, we sought to more fully understand the relationship between ruminal microbial communities and enteric CH 4 emissions in dairy heifers at different physiological stages.…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, little to no work has considered the methanogenic output of heifers, even though these animals produce more CH 4 per unit feed intake than older, lactating cows. 11,12 Here, we sought to more fully understand the relationship between ruminal microbial communities and enteric CH 4 emissions in dairy heifers at different physiological stages. To accomplish this, rumen microbial communities in prepubertal (PP), pubertal (PB), and pregnant heifers (PG) were assessed along with CH 4 emissions and production traits to identify future targets for mitigation efforts in these young animals.…”

Section: Discussionmentioning

confidence: 99%