The objective of this study was to evaluate greenhouse gases (GHG) emissions from a feedlot pen surface where Nellore and Brangus bulls were fed diets with low or high fat

BARROS, P. E. P.

COSTA JÚNIOR, C.

GOMES, R. da C.

MARINO, C. T.

MEDEIROS, S. R. de

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478Feedlot pen surface greenhouse gases emissions from Nellore or Brangusbulls finished on diets with contrasting fat levelsFeedlot pen surface greenhouse gases emissions from Nellore or Brangus bulls finished on diets with contrasting fat levelsSérgio Raposo de MEDEIROS1*, Ciniro COSTA JÚNIOR2, Rodrigo da Costa GOMES1, Carolina Tobias MARINO1, Paulo Eduardo Pedrosa BARROS31Embrapa Beef Cattle, Brazil; 2Institute of Agricultural and Forest Ma-nagement and Certification - Imaflora, Brazil, 3Federal University from the Vales of Jequitinhonha and Mucuri, Brazil;. E-mail: sergio.medei-ros@embrapa.br*IntroductionThe objective of this study was to evaluate greenhouse gases (GHG) emissions from a feedlot pen surface where Nellore and Brangus bulls were fed diets with low or high fat.Material and MethodsFour pens were selected to be the experimental units, each one recei-ving a treatment as the combination of the diets and breeds tested: 1) Low fat, Nellore (n=10); 2) High fat, Nellore (n=9); 1) Low fat, Brangus (n=10); 2) High fat, Brangus (n=10). Fat levels were 3.2% and 6.4%, (ether extract % DM). Pens were rotationally occupied during all feedlot period (84 days) and each animal remained for at least 48 hours in two occasions in the pen of his respective treatment. GHG emission was measured using gas chambers (32 cm X 53 cm X 32 cm), according to Costa Jr. et al. (2014). The samples were analyzed for methane (CH4), carbon dioxide (CO2) and nitrogen oxi-de (NO2) by gas chromatography. Obtained values were used on for-mulas taking into account temperatures, chamber volume and surface area, atmospheric pressure and collection time to estimate the flux 479Feedlot pen surface greenhouse gases emissions from Nellore or Brangusbulls finished on diets with contrasting fat levelsof each gas as mass/area/time (mg/m2/d). Only descriptive statistical analysis are presented.Results and ConclusionsFrom Table 1, an extremely high variability can be observed, what is usual in this kind of study but was aggravated by the greatly variable weather conditions during the experiment. Further analysis including other effects (i.e. time, rain, soil moisture) are needed. The mean data of 81 g CO2-Eq./pen/day represents about 3% of the expected daily enteric emission of the animals.Table 1. Flux ± standard deviation (mg/m2/day) of Methane, Nitrogen Oxide and Carbon Dioxide for high fat (HF) or low fat (LF) diets fed to Brangus (Bran) or Nellore (Nel) bulls and the mean CO2-Eq for each treatment (g/day/pen)Variable Methane Nitrogen Oxide Carbon Dioxide CO2- Eq (g/d/pen)HF, Bran 0.64 ± 0.84 6.78 ± 6.66 717 ± 324 113LF, Bran 1.09 ± 1.52 1.97 ± 1.79 485 ± 180 45HF, Nel 0.57 ± 0.55 2.12 ± 1.28 487 ± 203 46LF, Nel 1.13 ± 6.66 7.24 ± 9.24 755 ± 258 121ReferencesCOSTA JR, C.; CHANGSHENG, L.; CERRI, C. E. P.; et al. Measuring and modeling ni-trous oxide and methane emissions from beef cattle feedlot manure management: First assessments under Brazilian condition. J. Environ. Sci. and Health, Part B. 49, 696–711, 2014.AcknowledgementsPNPD/CNPq (101410/2011-5).

Feedlot pen surface greenhouse gases emissions from Nellore or Brangus bulls finished on diets with contrating fat levels.

http://www.alice.cnptia.embrapa.br/bitstream/doc/1061983/1/Feedlotpensurfacegreenhouse.pdf

Feedlot pen surface greenhouse gases emissions from Nellore or Brangus bulls finished on diets with contrating fat levels.

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