Measurement of methane gas in Anglo-Nubian goats under rotational grazing at different residual LAI

• Grant number: 09/13966-5
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: November 01, 2009
• End date: April 30, 2010
• Field of knowledge: Agronomical Sciences - Animal Husbandry - Pastures and Forage Crops
• Principal Investigator: Ana Cláudia Ruggieri
• Grantee: Jacqueline Nayara Ferraça Leite
• Host Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil

Abstract

The experiment aims at evaluating the methane production of goats Anglo-Nubian kept under different IAF residual rotation system in Tanzania grass, using the technique of tracer gas SF6.O testing period is from November 2009 to October 2010 . The area is subdivided into 18 plots of 243 m2. The experiment will be arranged based on a completely randomized design with three IAF residual (0.8 - 1.6 to 2.4 IAFr) with four replications, divided in time. The rest period will be adopted according to the criterion of 95% of IL. Animals pasture to reach the IAF predetermined for the residue. To measure the methane gas will be used 12 animals of the Anglo-Nubian, four per treatment, kept under grazing day lasting 11 hours on a rotational grazing system and jailed overnight in individual pens, where they will be supplemented with a single supplement. Be given a capsule containing SF6 release rate with known and is housed in the rumen. A halter fitted with capillary tube is set in the animal's head and connected to a camera (yoke) from polyvinyl chloride (PVC) previously submitted to vacuum. A valve fitted at Oxbow opens to begin the harvest, and the extent to which the yoke vacuum sampler slowly dissipates, a sample of air in the region of the nostrils of the animal is captured at a constant rate of aspiration. After the assessments are made in animals, the yokes will be stored for two days and then sent to Embrapa / Jaguariúna, where they will be subjected to measurements of pressure and dilution with nitrogen for later analysis such chromatography. Prior to beginning the assessment the animals go through a period of 15 days adaptation to use the halter and the yoke collector before starting the harvest. After the adaptation of animals to the sampling apparatus, samples of rumen gases will be held over three consecutive days for four weeks followed by 12 hours apart.