Fecha/hora: 03/06/2024 08:44:08

Biblioteca(s): 	INIA Treinta y Tres.	
Fecha corriente: 	29/10/2019	
Fecha de la última actualización: 	29/10/2019	
Autoria: 	SAVIAN, J.V.; PRIANO, M.E.; NADIN, L.B.; TIERI, M.P.; MARINHO TRES SCHONS, R.; BASSO, C.; PONTES PRATES, A.; BAYER, C.	
Afiliación: 	JEAN VICTOR SAVIAN, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay. Grazing Ecology Research Group, Federal University of Río Grande do Sul, Porto Alege, RS, Brasil.; MARÍA EUGENIA PRIANO, Research Center in Physics and Engineering of the Center of the Province of Buenos Aires; LAURA BEATRIZ NADIN, Veterinary Faculty, National University of the Centre of the Province of Buenos Aires, Tandil, Argentina; MARÍA PAZ TIERI, National Institute of Agricultural Technology, Rafaela, Santa Fé, Argentina; RADAEL MARINHO TRES SCHONS, Grazing Ecology Research Group, Federal University of Río Grande do Sul, Porto Alegre, Brasil.; CATARINE BASSO, Grazing Ecology Research Group, Federal University of Río Grande do Sul, RS, Brasil.; ARTHUR PONTES PRATES, Grazing Ecology Research Group, Federal University of Río Grande do Sul, RS, Brasil.; CIMÉLIO BAYER, Department of Soil Science, Federal University of Río Grande do Sul, Porto Alegre, RS, Brasil.	
Título: 	Effect of sward management on the emissions of CH4 and N2O from faeces of sheep grazing Italian ryegrass pastures.	
Año de publicación: 	2019	
Fuente/Imprenta: 	Small Ruminant Reseach, Sept. 2019, volume 178, Pages 123-128.	
DOI: 	10.1016/j.smallrumres.2019.08.011	
Idioma: 	Inglés	
Notas: 	History Article: Received 4 April 2019; Received in revised from 21 August 2019; Accepted 22 August 2019. Available online 24 August 2019.	
Contenido: 	Rotatinuous stocking (RN) management is based on animal ingestive behaviour responses, where optimal preand post-grazing sward heights are defined to increase nutrient intake per unit of grazing time. We hypothesized that the optimal sward structure and consequently, a high herbage nutritive value in RN treatment results in a
greater faecal nitrogen (N) excretion by sheep and consequently, a greater faecal greenhouse gas (GHG) emissions compared with the traditional rotational stocking (RT) management, which is based on a maximum herbage accumulation and harvest. Therefore, the aim of this study was to evaluate the effect of two grazing
management strategies (RN and RT) on the amount of dry matter (DM) faecal excretion, faecal N excretion and faecal GHG (CH4 and N2O) emissions from growing sheep grazing Italian ryegrass pastures. In order to evaluate faecal production and N excretion per animal and per ha, a first experiment (1) was carried out: RT - pre and post-grazing sward heights of 25 and 5 cm, respectively and, RN - pre and post-grazing sward heights of 18 and 11 cm, respectively. A second experiment (2) was carried out to measure the CH4 and N2O fluxes from faeces, using the static chamber method. Daily DM faecal and N excretion per animal were higher (P<0.001) in RN compared with RT treatment. However, when considered daily DM faecal and N excretion per ha, results were lower (P<0.001) for the RN than the RT treatment. CH4 and N2O emissions from faeces were higher (P<0.001) in RN compared with RT treatment, both per animal and per hectare. In conclusion, our study showed that the RN grazing management, based on animal behaviour, resulted in a higher daily N excretion per animal and higher CH4 and N2O emissions from faeces of sheep grazing Italian ryegrass pastures. This study contributes to improve GHG national inventories for the subtropical Brazilian climatic conditions, where estimations from CH4 and N2O emissions factors for faeces from growing sheep grazing Italian ryegrass are markedly lower than the values reported by IPCC Default Tier 1.	
Palabras-Clave: 	FACTOR DE EMISIÓN FECAL; FAECAL EMISSION FACTOR; GREENHOUSE GASES; GROWING SHEEP; PASTURE MANAGEMENT; SWARD HEIGHT.	
Thesagro: 	GASES DE EFECTO INVERNADERO; MANEJO DE PASTURAS.	
Categoría del tema: 	L01 Ganadería	
Registro original: 	INIA Treinta y Tres (TT)	
Ejemplares: 	TT - (102891-1) - PXI - AP - DD - PP/SMALL-RUMINANT-RESEARCH/2019/178 -  -  - DIS