Pasture characteristics of Italian ryegrass and milk production under different management strategies

Pesquisa Agropecuária Brasileira

Marcolino Frederico Miguel¹  Henrique Mendonça Nunes Ribeiro Filho¹  Steben Crestani¹  Fabiana Da Rocha Ramos¹  Tereza Cristina Moraes Genro² 

[1] ,Universidade do Estado de Santa Catarina Centro de Ciências Agroveterinárias Lages SC ,Brazil

关键词: Lolium multiflorum;    dairy cow;    herbage intake;    sward structure;    Lolium multiflorum;    vaca leiteira;    estrutura do pasto;    consumo de forragem;   

DOI  :  10.1590/S0100-204X2012000600018

来源: SciELO

【 摘 要 】

The objective of this work was to assess the effects of the sward structure of Italian ryegrass (Lolium multiflorum), during the first grazing cycle, on its morphological and bromatological characteristics throughout the growing season, and on the performance of dairy cows. The treatments consisted of two structures obtained as a function of canopy-light interception: high-light interception (HLI) and low-light interception (LLI), with different pre-grazing heights in the first grazing cycle. Pasture was managed under rotational grazing with a herbage allowance not below 30 kg dry matter (DM) per cow per day. Three grazing cycles, with a grazing interval of 30 days, were evaluated. Pre-grazing herbage mass was greater (2,240 vs. 1,656 kg ha-1 DM), but the proportion of leaf blades was smaller (0.35 vs. 0.43) for HLI swards. Neutral detergent fiber (NDF) content and organic matter digestibility (OMD) were similar between treatments in the first grazing cycle, but in the second and third ones NDF was greater, and OMD lower, for the HLI swards. Milk yields were greater for cows grazing LLI swards (19.4 vs. 21.1 kg per day). Initial grazing with 90% of light interception promotes greater nutritional value in the subsequent cycles.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License