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Determination of methane production from lactating goats fed diets with different starch levels

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2012 IX International Livestock Environment Symposium (ILES IX)  ILES12-0842.(doi:10.13031/2013.41651)
Authors:   María Carmen López, Carla Ibáñez, Fernando Juan García-Diego, Vicente Javier Moya, Fernando Estellés, Concepción Cervera, Carlos Fernández
Keywords:   methane production, Murciano-Granadina goat, retained energy

The methane (CH4) production was determined by indirect calorimetry. Twelve Murciano-Granadina goats at late lactation were fed with two isoenergetic diets (17.46 MJ/kg DM) with two different quantities of starch (29.03% vs. 14.44%) in a cross over design. Alfalfa hay and barley straw were the source of forage and mixes of concentrate (65%) were used to achieve the requirements during lactation. The goats were allocated to individual metabolism cages. After 8 d of adaptation, feed intake, total fecal and urine output, and milk yield were recorded daily during a 5 d period. Then, gas exchange measurements were recorded by a mobile open-circuit respirometry system using a face mask. Methane production was 60.60 and 100.37 kJ/kg BW0.75/d for the diet high and low in starch, respectively. Not significant differences were observed for milk production and composition between diets.The methane conversion factor was higher for diet lowest in starch (6.70% vs. 3.26%).

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