Modeling methane emissions from cattle in Mexico

Ruíz-Suárez, L. G.; González-Avalos, Eugenio

doi:10.1016/s0048-9697(97)80008-3

Cited by 3 publications

(3 citation statements)

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“…Other models for calculating GHG inventories have been developed by Ruiz-Suárez and González-Avalos (1997), but these authors included only enteric and manure CH 4 emissions from dairy and beef cattle. The authors modified IPCC Tier I model (EEF given for Mexican region) by calculating energy intake on the basis of bodyweight.…”

Section: Greenhouse Gases From Dairy Cattle In Mexicomentioning

confidence: 99%

Trends in greenhouse gas emissions from dairy cattle in Mexico between 1970 and 2010

et al. 2014

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The objective of the present work was to estimate and assess trends in greenhouse gas (GHG) emissions, particularly methane (CH4) and nitrous oxide (N2O), from dairy cows in Mexico from the base year of 1970 to 2010. Empirical and mechanistic models were used to estimate enteric methane emissions based on chemical composition of diets. Methane from manure was calculated using Intergovernmental Panel for Climate Change (IPCC) and US Environmental Protection Agency recommended equations. N2O emission was calculated according to IPCC recommendations. Compared with the 1970s, current management practices using modern dairy cows increased feed conversion efficiency 32% and milk yield 62%. GHG emission intensity (i.e. emissions per unit of product) was reduced 30%, 25% and 30% for CH4, N2O and total emissions, respectively. The study showed that although GHG emissions in absolute terms increased in the past 40 years, emission intensity decreased due to higher level of production. This trend is likely to continue in the future, assuming milk production follows the same increasing trend as in other countries in North America.

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Section: Greenhouse Gases From Dairy Cattle In Mexicomentioning

confidence: 99%

Trends in greenhouse gas emissions from dairy cattle in Mexico between 1970 and 2010

et al. 2014

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“…La emisión entérica se representó en función del consumo de energía en el alimento, y éste a su vez, en función de la masa corporal típica de bovinos clasificados por edad y región climática, pero no se consideró el nivel de producción de leche (10) . Una modificación al Tier I para el inventario de México tomó en cuenta un ciclo productivo de 305 d en lactancia y 60 d de periodo seco, una producción promedio de 4,400 kg por lactancia de una vaca típica de 400 kg y un modelo de la curva de lactancia (30) ; sin embargo, el modelo de lactancia seleccionado correspondió al ajuste de…”

Section: Resultsunclassified

“…In these studies, enteric emissions are represented as a function of energy intake in the feed and typical body mass of cattle classified by age and climatic region, but milk production levels are not considered (10) . One national inventory applied a modified Tier I methodology using a 305 d lactation, a 60 d dry period, a 4,400 kg average yield per lactation in a typical 400 kg cow; and a lactation curve model (30) .…”

Section: Resultsmentioning

confidence: 99%

Estimación Tier II de emisión de metano entérico en hatos de vacas lactantes en Querétaro, México

López

Escobar

Azpiri

et al. 2016

Rev. Mex. Cienc. Pecu.

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RESUMENEl metano (CH 4 ) contribuye al cambio climático y su fuente antropogénica más importante es la fermentación entérica del ganado. A nivel continental el Panel Intergubernamental de Cambio Climático establece factores de emisión entérica de CH 4 por defecto (Tier I); pero las decisiones y evaluación de la mitigación necesitan estimaciones más exactas. Así, el objetivo fue calcular la emisión de metano entérico de hatos de vacas Holstein-Friesian en Querétaro, México con datos de pesaje de leche (Tier II). Las curvas de lactación se modelaron con la función gamma incompleta por lactancia y hato. Un total de 11,092 lactancias del 2007 tuvieron un rendimiento ajustado a 305 días (d) de 9,985 kg leche. La curva de lactancia fue diferente entre primíparas y multíparas; la duración de la lactancia fue 365±21 días. Durante la lactancia, la emisión entérica para primíparas y multíparas a 305 días fue 165.7±3.8 y 181.6±8.3 kg CH 4 vaca -1 ; a 365 d fue de 201.8±4.6 y 223.7±11.0 kg CH 4 vaca -1 (P<0.0025). La intensidad de emisión entérica fue semejante entre primíparas y multíparas (18 y 19 g CH 4 kg -1 leche), similar a lo reportado en la literatura para vacas de alta producción intensiva. Los registros de rendimiento fueron útiles para caracterizar el rendimiento, duración de la lactancia y el efecto de número de lactancia en su influencia sobre los estimados de intensidad de emisión entérica.PALABRAS CLAVE: Cambio climático, Factor de emisión, GEI, Mitigación, Metano. ABSTRACTMethane (CH 4 ) contributes to climatic change and livestock enteric fermentation is the most important anthropogenic source. The Intergovernmental Panel on Climate Change establishes continental default emission factors for enteric methane (Tier I); but decisions and evaluation of mitigation needs more precise estimates. Therefore, the objective was to calculate the enteric emission of Holstein-Friesian herds in Queretaro, México using milk test-day records (Tier II). Lactation curves were modeled using the incomplete gamma function according to lactation number and herd. A total of 11,092 lactations from 2007 had an average 305 d milk yield of 9,985 kg. Lactation curve was different between primiparous and multiparous; average days in milk were 365±21 d. During lactation, the primiparous and multiparous enteric emission at 305 d was 165.7±3.8 and 181.6±8.3 kg CH 4 head -1 ; at 365 d was 201.8±4.6 and 223.7±11.0 kg CH 4 head -1 (P<0.0025). Enteric emission intensity was similar between primiparous and multiparous (18 and 19 g CH 4 kg -1 milk), similar to reports in the literature for high yielding cows. Test day records were useful to characterize yield, days in milk and parity influencing the estimates of enteric emission intensity.

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Construction and Operation of a Respiration Chamber of the Head-Box Type for Methane Measurement from Cattle

Ortega

Beltrán

Pineda

et al. 2020

Animals

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This paper aims to describe the construction and operation of a respiration chamber of the head-box type for methane (CH4) measurements in bovines. The system consists of (1) a head box with a stainless steel frame and acrylic walls, floor, and ceiling; (2) a stainless steel feeder; (3) an automatic drinking water bowl; (4) a hood made from reinforced canvas; (5) an infrared (IR) CH4 gas analyzer, a mass flow generator, a data-acquisition system; and (6) a steel metabolic box. Six assays were conducted to determine the pure CH4 recovery rate of the whole system in order to validate it and comply with standards of chamber operation. The gravimetrical method was used for the recovery test and the recovery rate obtained was 1.04 ± 0.05. Once the system was calibrated, measurements of CH4 were conducted using eight animals consisting of four Holstein cows with a live weight of 593.8 ± 51 kg and an average milk yield of 23.3 ± 1.8 kg d−1 and four heifers with a live weight of 339 ± 28 kg. The CH4 production values were 687 ± 123 and 248 ± 40 L CH4 d−1 for cows and heifers, respectively. The CH4 yield was 19.7 ± 3.4 g and 17.1 ± 3.4 g CH4 kg−1 of dry matter consumed for cows and heifers, respectively. These results are consistent with those reported in the literature.

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Modeling methane emissions from cattle in Mexico

Cited by 3 publications

References 5 publications

Trends in greenhouse gas emissions from dairy cattle in Mexico between 1970 and 2010

Trends in greenhouse gas emissions from dairy cattle in Mexico between 1970 and 2010

Estimación Tier II de emisión de metano entérico en hatos de vacas lactantes en Querétaro, México

Construction and Operation of a Respiration Chamber of the Head-Box Type for Methane Measurement from Cattle

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