Facultad de Medicina Veterinaria y Zootecnia, Departamento de Nutrición Animal. Universidad Autónoma del Estado de México, Instituto Literario 100, Toluca, Estado de Mexico, 50000, Mexico
Programa de Maestría y Doctorado en Ciencias de la Salud y la Producción Animal, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Av. Universidad nº 3000, C.U., Ciudad de México, 04510, Mexico.
AgroSup Dijon, 26 bd Dr Petitjean, 21079 Dijon, France.
Programa de Maestría y Doctorado en Ciencias Agropecuarias y Recursos Naturales, Facultad de Medicina Veterinaria y Zootecnia. Instituto Literario 100, Toluca, Estado de Mexicom, 50000, Mexico.
Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Av. Universidad nº 3000, C.U., Ciudad de México, 04510, Mexico.
Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Av. Universidad nº 3000, C.U., Ciudad de México, 04510, Mexico.
Programa de Maestría y Doctorado en Ciencias Agropecuarias y Recursos Naturales, Facultad de Medicina Veterinaria y Zootecnia. Instituto Literario 100, Toluca, Estado de Mexicom, 50000, Mexico.
Programa de Maestría y Doctorado en Ciencias Agropecuarias y Recursos Naturales, Facultad de Medicina Veterinaria y Zootecnia. Instituto Literario 100, Toluca, Estado de Mexicom, 50000, Mexico.
The objective of this study was to evaluate the level of concentrate supplementation on the production and chemical composition of milk from 12 crossbred F1 dual-purpose cows (½ Bos taurus – ½ Bos indicus) and estimate the emission of CH4, N2O, and CO2 gases. The study included 12 crossbred F1 dual-purpose cows over 60 days of lactation. The cows grazed on 28% tropical native grassland and 72% Brachiaria spp. and Cynodon neumfluensis, supplemented with 0, 150, 300, and 450g of concentrate per kg daily milk production, during three experimental periods of 15 days each in a crossover design. Pasture and concentrate samples were collected and were analyzed for dry matter, crude protein, neutral detergent fiber, and acid detergent fiber. Milk production (kg d-1) was recorded daily, nitrous oxide (N2O), and emissions from excreta and daily CH4 production were calculated. Results were analyzed with the SAS MIXED procedure. Concentrate supplementation in tropical crossbred dairy cows did not improve milk yield but increased CH4 and N2O production (P < 0.0001) per cow as the concentrate increased in the diet; the Ym factor from the tropical region yielded less CH4 than the IPCC Ym model (P < 0.0001). In conclusion, the calculation of CH4 using specific emission factors for the tropical climate region is better than the IPCC default emission factors in order not to overestimate the CH4 emissions.
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