Data/hora: 22/06/2024 07:05:19

Biblioteca(s): 	Embrapa Meio Ambiente.	
Data corrente: 	06/08/2018	
Data da última atualização: 	06/08/2018	
Autoria: 	CONGIO, G. F. S.; BATALHA, C. D. A.; CHIAVEGATO, M. B.; BERNDT, A.; OLIVEIRA, P. P. A.; FRIGHETTO, R. T. S.; MAXWELL, T. M. R.; GREGORINI, P.; SILVA, S. C. da.	
Afiliação: 	GUILHERMO FRANCKLIN DE SOUZA CONGIO, ESALQ-USP; CAMILA DELVEAUX RAUJO BATALHA, ESALQ-USP; MARILIA BARBOSA CHIAVEGATO, ESALQ-USP; ALEXANDRE BERNDT, CPPSE; PATRICIA PERONDI ANCHAO OLIVEIRA, CPPSE; ROSA TOYOKO SHIRAISHI FRIGHETTO, CNPMA; THOMA M R MAXWELL, Lincoln University; PABLO GREGORINI, Lincoln University; SILA C DA SILVA, ESALQ-USP.	
Título: 	Strategic grazing management towards sustainable intensification at tropical pasture-based dairy systems.	
Ano de publicação: 	2018	
Fonte/Imprenta: 	Science of the Total Environment, v. 636, p. 872-880, 2018.	
DOI: 	https://doi.org/10.1016/j.scitotenv.2018.04.301	
Idioma: 	Inglês	
Conteúdo: 	Abstract: Agricultural systems are responsible for environmental impacts that can be mitigated through the adoption of more sustainable principles. Our objective was to investigate the influence of two pre-grazing targets (95% and maximum canopy light interception during pasture regrowth; LI95% and LIMax, respectively) on sward structure and herbage nutritive value of elephant grass cv. Cameroon, and dry matter intake (DMI), milk yield, stocking rate, enteric methane (CH4) emissions by Holstein?×?Jersey dairy cows. We hypothesized that grazing strategies modifying the sward structure of elephant grass (Pennisetum purpureum Schum.) improves nutritive value of herbage, increasing DMI and reducing intensity of enteric CH4 emissions, providing environmental and productivity benefits to tropical pasture-based dairy systems. Results indicated that pre-sward surface height was greater for LIMax (?135?cm) than LI95% (?100?cm) and can be used as a reliable field guide for monitoring sward structure. Grazing management based on LI95% criteria improved herbage nutritive value and grazing efficiency, allowing greater DMI, milk yield and stocking rate by dairy cows. Daily enteric CH4 emission was not affected; however, cows grazing elephant grass at LI95% were more efficient and emitted 21% less CH4/kg of milk yield and 18% less CH4/kg of DMI. The 51% increase in milk yield per hectare overcame the 29% increase in enteric CH4 emissions per hectare in LI95% grazing management. Thereby the same resource allocation resulted in a 16% mitigation of the main greenhouse gas from pasture-based dairy systems. Overall, strategic grazing management is an environmental friendly practice that improves use efficiency of allocated resources through optimization of processes evolving plant, ruminant and their interface, and enhances milk production efficiency of tropical pasture-based systems.	
Palavras-Chave: 	Canopy light interception; Elephant grass; Enteric methane emissions; Herbage quality; Land-use improvement; Milk production efficiency.	
Thesagro: 	Capim Elefante; Efeito Estufa; Gado Leiteiro; Impacto Ambiental; Pastagem; Pastejo; Produção Leiteira.	
Thesaurus Nal: 	Animal feeding; Dairy cattle; Grazing management; Greenhouse gas emissions; Methane; Milk yield.	
Categoria do assunto: 	P Recursos Naturais, Ciências Ambientais e da Terra	
Registro original: 	Embrapa Meio Ambiente (CNPMA)	
Exemplares: 	CNPMA - (16165-1) - UPC - SP - DD -  -  -  - DIS