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Title: Estimation of methane emissions from local and crossbreed beef cattle in Dak Lak province of Vietnam.
Authors: Dung, Van Tien
Ngoan, Le Duc
Herrero, Mario
Keywords: Household farming
Methane emissions
Issue Date: Jul-2017
Series/Report no.: Asian-Australasian Journal of Animal Sciences (AJAS);Vol. 30, No. 7, pp. 1054 - 1060
Abstract: Objective: This study was aimed at evaluating effects of cattle breed resources and alternative mixed-feeding practices on meat productivity and emission intensities from household farming systems in Daklak Province, Vietnam. Methods: Records from Local Yellow x Red Sindhi (Bos indicus; Lai Sind) and (1/2) Limousin, (1/2) Drought Master and (1/2) Red Angus cattle during the growth (0 to 21 months) and fattening (22 to 25 months) periods were used to better understand variations on meat productivity and enteric methane emissions. Parameters were determined by the Ruminant model. Four scenarios were developed: (HFS1) grazing from birth to slaughter on native grasses for approximately 10 h plus 1.5 kg DM/day (0.8 % LW) of a mixture of guinea grass (19%), cassava (43%) powder, cotton (23%) seed and rice (15%) straw; (HFS2) growth period fed with elephant grass (1% of LW) plus supplementation (1.5% of LW) of rice bran (36%), maize (33%) and cassava (31%) meals; and HFS3 and HFS4 computed elephant grass, but concentrate supplementation reaching 2 and 1% of LW, respectively. Results: Results show that compared to HFS1, emissions (72.3 +/- 0.96 kg CH4/animal/life; least squares means +/- SEM) were 15, 6 and 23% lower (P < 0.01) for the HFS2, HFS3 and HFS4, respectively. The predicted methane efficiencies (CO2eq) per kg of LW at slaughter (4.3 +/- 0.15), carcass weight (8.8 +/- 0.25 kg) and kg of edible protein (44.1 +/- 1.29) were also lower (P < 0.05) in the HFS4. In particular, irrespective of the HSF, feed supply and ratio changes had a more positive impact on emission intensities when crossbred (1/2) Red Angus cattle were fed than in their crossbred counterparts. Conclusion: Modest improvements on feeding practices and integrated modelling frameworks may offer potential trade-offs to respond to climate change in Vietnam.
Appears in Collections:Agriculture and rural development

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