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Strategic grazing management towards sustainable intensification at tropical pasture-based dairy systems.
Congio, Guilhermo F S; Batalha, Camila D A; Chiavegato, Marília B; Berndt, Alexandre; Oliveira, Patrícia P A; Frighetto, Rosa T S; Maxwell, Thomas M R; Gregorini, Pablo; Da Silva, Sila C.
Afiliación
  • Congio GFS; Animal Science Department, University of São Paulo, "Luiz de Queiroz" College of Agriculture (USP/ESALQ), Piracicaba, São Paulo, Brazil. Electronic address: guilhermo.congio@usp.br.
  • Batalha CDA; Animal Science Department, University of São Paulo, "Luiz de Queiroz" College of Agriculture (USP/ESALQ), Piracicaba, São Paulo, Brazil.
  • Chiavegato MB; Animal Science Department, University of São Paulo, "Luiz de Queiroz" College of Agriculture (USP/ESALQ), Piracicaba, São Paulo, Brazil.
  • Berndt A; Embrapa Pecuária Sudeste, São Carlos, São Paulo, Brazil. Electronic address: alexandre.berndt@embrapa.br.
  • Oliveira PPA; Embrapa Pecuária Sudeste, São Carlos, São Paulo, Brazil. Electronic address: patricia.anchao-oliveira@embrapa.br.
  • Frighetto RTS; Embrapa Meio Ambiente, Jaguariúna, São Paulo, Brazil. Electronic address: rosa.frighetto@embrapa.br.
  • Maxwell TMR; Faculty of Agriculture and Life Sciences, Lincoln University, Christchurch, New Zealand. Electronic address: tom.maxwell@lincoln.ac.nz.
  • Gregorini P; Faculty of Agriculture and Life Sciences, Lincoln University, Christchurch, New Zealand. Electronic address: pablo.gregorini@lincoln.ac.nz.
  • Da Silva SC; Animal Science Department, University of São Paulo, "Luiz de Queiroz" College of Agriculture (USP/ESALQ), Piracicaba, São Paulo, Brazil. Electronic address: siladasilva@usp.br.
Sci Total Environ ; 636: 872-880, 2018 Sep 15.
Article en En | MEDLINE | ID: mdl-29727853
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.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Industria Lechera / Desarrollo Sostenible Aspecto: Determinantes_sociais_saude Límite: Animals País/Región como asunto: Africa Idioma: En Revista: Sci Total Environ Año: 2018 Tipo del documento: Article Pais de publicación: Países Bajos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Industria Lechera / Desarrollo Sostenible Aspecto: Determinantes_sociais_saude Límite: Animals País/Región como asunto: Africa Idioma: En Revista: Sci Total Environ Año: 2018 Tipo del documento: Article Pais de publicación: Países Bajos