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- Title
Development and evaluation of prediction equations for methane emission from Nellore cattle.
- Authors
Pires Sobrinho, Tatiana Lucila; Branco, Renata Helena; Magnani, Elaine; Berndt, Alexandre; Canesin, Roberta Carrilho; Zerlotti Mercadante, Maria Eugênia
- Abstract
Dry matter intake (DMI), nutrient intake and enteric CH4 emission were evaluated in 48 Nellore cattle (392 ± 27 days of age). Equations were generated from intake data and evaluated using root mean square prediction error (RMSPE), and validated by cross-validation. Equations that included DMI and hemicellulose intake (HEMI) [CH4(MJ d-1) = 4.08(±1.65) + 11.6(±2.34)DMI(kg d-1) - 33.4(±7.21)HEMI(kg d-1)]; DMI and total carbohydrate intake (TCHI) [CH4(MJ d-1) = 5.26(±1.69) - 6.3(±1.47)DMI(kg d-1) + 8.8(±1.81)TCI(kg d-1)]; metabolizable energy intake (MEI) and cellulose intake (CELI) [CH4(MJ d-1) = 5.16(±1.72) - 0.13(±0.048)MEI(MJ d-1) + 7.37(±1.53)CELI(kg d-1)], and non-fiber carbohydrate intake (NFCI) [CH4(MJ d-1) = 3.14(±1.48) + 3.65(±1.05)NFCI(kg d-1)] resulted in the lowest RMSPE (14.3, 14.1, 14.3 and 14.7%, respectively). When literature equations were evaluated using our database, the most accurate predictions were obtained with equations that included DMI and lignin intake (RMSPE = 15.27%) and MEI, acid detergent fiber intake and lignin intake (RMSPE = 15.7%). The mean error of predicting enteric CH4 emission with the equations developed in this study based on DMI and nutrient intake is 17% and the most accurate predictions are obtained with equations including DMI, carbohydrate intake and MEI.
- Subjects
BEEF cattle; DRY matter in animal nutrition; GREENHOUSE gases; SULFUR hexafluoride; SULFUR compounds
- Publication
Acta Scientiarum: Animal Sciences, 2019, Vol 41, p1
- ISSN
1806-2636
- Publication type
Article
- DOI
10.4025/actascianimsci.v41i1.42559