SciELO - Scientific Electronic Library Online

 
vol.16 número1Estimación de la evapotranspiración de referencia a partir de tanque «A» en el noroeste del UruguayProductividad de vacas lecheras en pasturas de festuca o de Dactylis índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Links relacionados

Compartilhar


Agrociencia (Uruguay)

versão impressa ISSN 1510-0839versão On-line ISSN 2301-1548

Resumo

SALDANHA, Sylvia; BOGGIANO, Pablo  e  CADENAZZI, Mónica. Herbage Allowance, Production and Composition of a Lolium Perenne Pasture. Agrociencia Uruguay [online]. 2012, vol.16, n.1, pp.150-159. ISSN 1510-0839.

For a better understanding of the consequences of the application of different grazing intensities, functions of response of composition and forage production of a pasture of Lolium perenne under different grazing herbage allowance levels (OF) were developed, and their structural characteristics were analysed with a multivariate method. The OF evaluated were 2.0- 4.5-7.0 and 9.5 DM kg/100 kg of animal liveweight/day. The relationships between forage production and relative forage utilization with the OF were lineal: forage production (DM kg/ha)=3619+1078OF, (P<0.0038; r2=0.74); forage utilization (percentage )=88.8-3.86OF, (P<0.0066; r2=0.69), but no differences were detected in the disappeared forage. The relationship between pre-graze aerial biomass and foliage height (cm) for the entire period was: aerial biomass (DM kg/ha) = -758 + 237x (P<0.0001; r2 = 0.79), for x=height (cm). The pre-graze green leaves biomass was lineally affected (P<0.01; r2=0.70) ) by the remainder green leaves biomass post-graze and by tillers density (P<0.0001; r2=0.67). Principal component analysis indicated that, under these conditions, only the biggest OF evaluated maintained the values of variables relatively high, suggesting a highest pasture productivity and stability under these treatments. The relationships achieved are useful for pasture management, although the environmental conditions changed during the experimental period, the grazing frequency was higher than the recommended and some tillers began to reproductive state

Palavras-chave : PERENNIAL RYEGRASS; GRAZING INTENSITY; LEAVES BIOMASS.

        · resumo em Espanhol     · texto em Espanhol     · Espanhol ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons