Grazing ecology of female lambs on Italian ryegrass plus red clover pasture under different defoliation intensities

Revista Brasileira de Zootecnia

Carine Lisete Glienke²  Marta Gomes Da Rocha¹  Daniele Gindri Camargo¹  Luciana Pötter¹  Anna Carolina Cerato Confortin²  Vagner Guasso Da Costa² 

[1],Universidade Federal de Santa Maria RS

关键词: bite rate;    feeding stations;    ingestive behavior;    Lolium multiflorum;    pasture structure;    Trifolium pratense;    comportamento ingestivo;    estações alimentares;    estrutura do pasto;    Lolium multiflorum;    taxa de bocados;    Trifolium pratense;   

DOI  :  10.1590/S1516-35982010000100007

来源: SciELO

【 摘 要 】

The relationship between pasture dynamics and ingestive behavior of female lambs was studied on Italian ryegrass (Lolium multiflorum Lam.) plus red clover (Trifolium pratense L.) mixture under a range of defoliation intensities. Rotational grazing was used and the grazing interval was determined by the thermal sum of 313 degree days. The initial pre-grazing canopy height disappearance values were 65 (very high), 58 (high), 47 (medium) and 37% (low). The sward vertical structure was similar among defoliation intensities. The forage allowance decreased linearly as defoliation intensities increased, with 0.35 bite/minute reduction for each 1% increase in forage allowance. The bite rate and number of bites/feeding station decreased with reduced contribution of leaves in the sward structure. It was associated, respectively, with an increase and a decrease of NDF and CP levels in forage as grazed by female lambs. The pasture cycle proves to be more important than defoliation intensities as a source for changes in feeding stations and displacement patterns of female lambs.

【 授权许可】

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