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Management of Aries and Aruana Guinea grass cultivars under rotational stocking based on canopy light interception

Published online by Cambridge University Press:  30 September 2021

F. P. Campos Open the ORCID record for F. P. Campos [Opens in a new window] ,
P. Sarmento ,
W. T. Mattos ,
L. Gerdes ,
R. A. Carnevalli  and
C. G. Lima
F. P. Campos*
Affiliation:
Institute of Zootechny, IZ/APTA/SAA, Nova Odessa, SP13380-011, Brazil
P. Sarmento
Affiliation:
Institute of Zootechny, IZ/APTA/SAA, Nova Odessa, SP13380-011, Brazil
W. T. Mattos
Affiliation:
Institute of Zootechny, IZ/APTA/SAA, Nova Odessa, SP13380-011, Brazil
L. Gerdes
Affiliation:
Institute of Zootechny, IZ/APTA/SAA, Nova Odessa, SP13380-011, Brazil
R. A. Carnevalli
Affiliation:
National Dairy Cow Research Center/EMBRAPA, Juiz de Fora, MG36038-330, Brazil
C. G. Lima
Affiliation:
Department of Basic Sciences, USP – University of São Paulo, ZAB/FZEA, Pirassununga, SP, 13635.900, Brazil
*
Author for correspondence: F. P. Campos, E-mail: [email protected]
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Abstract

Efforts were made to obtain forage cultivars with high production capacity and quality and to determine the ideal time to start animal grazing, respecting the morphological characteristics of the grasses. For this purpose, the nutritional value, digestibility and characteristics of the forage canopy of Aries and Aruana (Megathyrsus maximus (Jacq.) or Panicum maximum) cultivars kept under rotational stocking with sheep were evaluated and the management height was determined based on 95% light interception (LI). The experiment was evaluated with repeated measures over time (grazing cycles by season, in 2 years) with a treatment factor (grass cultivar) in a completely randomized block design with eight replicates, using 800 m2 paddocks. The height of the forage canopy before grazing (pre-grazing) determined by 95% LI stabilized around 29 cm. The highest proportion of Aruana leaf blades was observed in winter. Aries grass presented similar leaf blade percentages in summer, autumn and spring. Similar forage accumulation (FA) was observed for both cultivars, decreasing in spring, autumn and winter. Higher crude protein and in vitro dry matter digestibility (IVDMD) were seen in Aries grass, while Aruana grass presented higher neutral and acid detergent fibre and cellulose and lower IVDMD. The nutritional quality of the grasses was maintained throughout the year. The height of the forage canopy of Aries and Aruana recommended for entry into the paddock is 29 cm to maintain nutritional quality. The successful management strategy adopted for grasses combined with nitrogen fertilization provided a greater forage mass quality.

Keywords

Animal grazingdry matter digestibilityforage accumulationmanagement successnutritional quality
Type
Crops and Soils Research Paper
Information
The Journal of Agricultural Science , Volume 159 , Issue 5-6 , July 2021 , pp. 385 - 403
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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