Twenty-five-centimeter pre-grazing canopy height in palisade grass and forage peanut

Autor: Igor Machado Ferreira, Bruno Grossi Costa Homem, Italo Braz Gonçalves de Lima, José Carlos Batista Dubeux Junior, Thiago Fernandes Bernardes, Marina de Arruda Camargo Danés, Daniel Rume Casagrande
Jazyk: English<br />Spanish; Castilian<br />Portuguese
Rok vydání: 2021
Předmět:
Zdroj: Scientia Agricola, Vol 79, Iss 2 (2021)
Druh dokumentu: article
ISSN: 1678-992X
1678-992x
DOI: 10.1590/1678-992x-2020-0090
Popis: ABSTRACT: Short-term grazing behavior variables are sensitive to the canopy structure and have an impact on daily forage intake. This study evaluated the effect of pre- and post-grazing canopy heights on the forage harvesting process at a patch scale in a mixture of Brachiaria brizantha (Hochst. ex A. Rich.) Stapf. syn. Urochloa brizantha R.D. Webster cv. Marandu (palisade grass) and Arachis pintoi Krapov. & W.C. Greg. cv. Belomonte (forage peanut). Treatments were allocated to a split-plot arrangement in a completely randomized design. The plots, in their entirety, consisted of two pre-grazing canopy heights: 25 cm (CH25) and 35 cm (CH35); subplots consisted of three levels of defoliation severity: no defoliation (DS0); 20% depletion of pre-grazing canopy height (DS20); and 40% depletion of pre-grazing canopy height (DS40), with eight replications. Heifers were allowed to graze the patches (0.7 × 0.7 m) and their grazing behavior was recorded. Canopy structure measurements were taken both before and after grazing. Patches from CH35 presented greater stem mass for grass (p = 0.001) and legume (p = 0.002) than did patches from CH25. Bite rate, bite mass and instantaneous intake rate were greater for CH25 than for CH35 (p < 0.001, p = 0.068, and p = 0.074), and bite mass and instantaneous intake rate were lower for DS20 compared to DS0 (p = 0.032 and p = 0.016). Greater stem mass in the grazing strata negatively influenced the instantaneous intake rate.
Databáze: Directory of Open Access Journals
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