Bibliographic citations
Gómez, G., (2023). Cuantificación del metano entérico de alpacas y ovinos en pastos naturales altoandinos y huella de carbono de la producción alpaquera [Universidad Nacional Agraria La Molina]. https://hdl.handle.net/20.500.12996/5720
Gómez, G., Cuantificación del metano entérico de alpacas y ovinos en pastos naturales altoandinos y huella de carbono de la producción alpaquera []. PE: Universidad Nacional Agraria La Molina; 2023. https://hdl.handle.net/20.500.12996/5720
@phdthesis{renati/246607,
title = "Cuantificación del metano entérico de alpacas y ovinos en pastos naturales altoandinos y huella de carbono de la producción alpaquera",
author = "Gómez Oquendo, Giovanna Janet",
publisher = "Universidad Nacional Agraria La Molina",
year = "2023"
}
Alpacas and sheep present differences in their digestive anatomy and physiology, in addition, alpacas are more efficient using nutrients from pastures of poor nutritional quality. The main of this research was to compare enteric methane emissions between alpacas and sheep under an extensive rearing system and to estimate the carbon footprint of alpaca production. The enteric methane (CH4) emission of eight male huacaya breed alpacas and eight male creole sheep fed with natural high Andean pastures were measured and compared during dry season, using the sulfur hexafluoride tracer gas technique. The digestibility of organic matter (DOM) was estimated using prediction equations. Likewise, the content of neutral detergent fiber (NDF), crude protein (CP), and ash (A) of alpacas and sheep diet was determined. The results show statistical differences (P <0.05) in the amount of NDF in diet and DOM, obtaining in both cases higher levels in alpacas. However, no statistical differences (P> 0.05) were found in the parameters: production of CH4 in g / day (21.8 v 22.7g), production of CH4 in g / day kg LW⁰⁷⁵ (1.4 v 1.8g), production of CH4 in g / kg DMI (25.9 v 21.8g) and g/kg OMI (28.4 v 23.9) between alpacas and sheep. These results suggested that alpacas are more efficient at digesting fiber from food; however, under environmental conditions where resource availability is low, methane emissions are similar in alpacas and sheep. Using the emission factor of CH4 obtained in the first part of this research, as well as other data from the same alpaca herd evaluated, the carbon footprint (CF) of one kg of live weight (LW) was calculated. The life cycle analysis (LCA) methodology was used and the ISO 14040 guidelines were followed. The CF estimated in the alpaca system with a harvest percentage of 20 percent using the economic allocation and the allocation by mass was 24.0 and 29.5 kg of CO2-eq/kg of LW and for biophysical allocation was 22.6 kg of CO2-eq/kg of meat. Likewise, the CF per unit area was also determined, obtaining 88.6 kg of CO2-eq / ha. In the same way, the CH with different percent of extraction (10, 15, 20, 25, 30 percent) was determined by biophysical assignment, observing that as the percent of extraction increases, the CF of alpaca fiber and meet decreases. On the other hand, it was also determined that the component with the highest value that makes up the CF in alpaca production comes from methane emissions from enteric fermentation (66.9 percent).
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