Methane and Nitrous Oxide Emissions from Cattle Excreta on an East African Grassland.
J Environ Qual
; 45(5): 1531-1539, 2016 Sep.
Article
en En
| MEDLINE
| ID: mdl-27695760
Greenhouse gas (GHG) emission measurements from livestock excreta in Africa are limited. We measured CH and NO emissions from excreta of six Boran () and six Friesian () steers near Nairobi, Kenya. The steers were fed one of three diets (T1 [chaffed wheat straw], T2 [T1 + Meissner - 0.2% live weight per day], and T3 [T1 + calliandra - 0.4% live weight every 2 d]). The T1 diet is similar in quality to typical diets in the region. Calliandra is a leguminous fodder tree promoted as a feed supplement. Fresh feces and urine were applied to grasslands and emissions measured using static chambers. Cumulative 28-d fecal emissions were 302 ± 52.4 and 95 ± 13.8 mg CH-C kg dry matter for Friesen and Boran steers, respectively, and 11.5 ± 4.26 and 24.7 ± 8.32 mg NO-N kg dry matter for Friesian and Boran steers, respectively. For urine from Friesian steers, the NO emissions were 2.8 ± 0.64 mg NO-N 100 mL urine. The CH emission factors (EFs) (246 ± 49.5 and 87 ± 12.7 g CH-C yr animal for Friesan and Boran, respectively) were lower than the International Panel on Climate Change EFs (750 g CH-C animal yr), whereas the NO EFs (0.1 and 0.2% for the Friesian and Boran feces, respectively, and 1.2% for urine) were also lower than International Panel on Climate Change estimates. The low N content of the excreta likely caused the low emissions and indicates that current models probably overestimate CH and NO emissions from African livestock manure.
Buscar en Google
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Estiércol
/
Metano
/
Óxido Nitroso
Tipo de estudio:
Prognostic_studies
Límite:
Animals
País/Región como asunto:
Africa
Idioma:
En
Revista:
J Environ Qual
Año:
2016
Tipo del documento:
Article
Pais de publicación:
Estados Unidos