Desempenho de novilhos de corte em pastos de capim-tanzânia sob quatro alturas de desfolha

Barbero, Rondineli Pavezzi; Barbosa, M.A.A.F.; Castro, Letícia Maria de; Ribeiro, E. L. A.; Mizubuti, Ivone Yurika; Júnior, Valter Harry Bumbieris; Silva, Leandro das Dôres Ferreira da; Júnior, Fernando Luiz Massaro

doi:10.1590/1678-41625481

Cited by 9 publications

(5 citation statements)

References 11 publications

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“…Difante et al (2010) investigated the same species in rotational grazing conditions and reported lower gains, between 559 and 601 kg ha -1 for grazing pasture heights of 50 and 25 cm, respectively, but used 67.5 kg ha -1 N. The results observed in this study and other studies related to animal production on pasture reveal that the management of the species and the level of fertilization adopted are crucial for good performance, whether for individual gain or by area. In another study that also used Tanzania grass, but with heights between 20 and 80 cm, Barbero et al (2014) found similar gains in the average weight per day to this study (mean values of 1.06 kg day -1 ) with variations in the range 0.95-1.27 kg day -1 ; the study was also conducted in the summer period.…”

Section: Resultssupporting

confidence: 80%

Animal performance, production, and quality of Tanzania grass fertilized with nitrogen

Cecato

Almeida

Rêgo

et al. 2017

SCA

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This study aimed to assess forage production, animal performance, and the chemical composition of Tanzania grass pasture fertilized with 50, 100, 200, and 400 kg ha-1 of nitrogen. The variables analyzed were: leaf mass, daily accumulation rate, leaf/stem ratio, average daily gain, stocking rate, live weight gain per unit of area crude protein, neutral detergent fiber, and in vitro dry matter digestibility of leaves. The pasture management maintained the pasture height at 50 cm by using a continuous grazing method with the adjustment of stocking rate. The experimental design was a randomized block with three replicates. The leaf mass increased linearly in response to nitrogen, with an increase of 1003 kg (34%) observed between a nitrogen content of 50 and 400 kg ha-1. Nitrogen did not affect the average daily gain, but increased the stocking rate and live weight gain ha-1. The value of crude protein and neutral detergent fiber were higher with increased nitrogen levels, whereas the leaf digestibility did not affect nitrogen use. The comparison of 50 and 400 kg ha-1 levels indicated that there was an average increase of 19.2% in the leaf crude protein. The increased application of nitrogen fertilizer in Tanzania grass improved the chemical composition and animal performance; with regard to studied variables, the dose of 200 kg ha-1 resulted in the greatest improvement.

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Section: Resultssupporting

confidence: 80%

Animal performance, production, and quality of Tanzania grass fertilized with nitrogen

Cecato

Almeida

Rêgo

et al. 2017

SCA

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“…In both experiments stocking rate was affected by treatments. This response was due to grazing intensification since it is usually necessary to increase stocking rate to maintain a lower grazing height (Mott, 1960;Barbero et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

Combining Marandu grass grazing height and supplementation level to optimize growth and productivity of yearling bulls

Barbero

Malheiros

Araújo

et al. 2015

Animal Feed Science and Technology

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Two experiments were conducted to determine the effects of grazing height and supplementation levels of Marandu pastures on average daily gain (ADG), gain per hectare (GPH) and methane (CH 4) emissions during the wet season under continuous stocking by Nelore yearling bulls. Exp. 1: three grazing heights were evaluated: 15, 25 and 35 cm, combined with 0.3% of BW of a supplement (161 g crude protein (CP)/kg and 20.1 MJ gross energy (GE)/kg on dry matter basis (DMB)). Experimental design was completely randomized (three paddocks per treatment), and the effects were analyzed by polynomial orthogonal contrasts. Exp. 2: grazing heights were combined with decreasing supplementation levels as grazing heights increased: short height (15 cm) and high supplementation (0.6% of BW of a supplement: 142 g CP/kg and 18.9 MJ GE/kg on DMB) (SHHS); moderate height (25 cm) and moderate supplementation (0.3% of BW of a supplement: 161 g CP/kg and 20.1 MJ GE/kg on DMB) (MHMS) or tall height (35 cm) without supplementation) (THWS). Experimental design was completely randomized (three paddocks per treatment), and treatment means were compared by Tukey test (P < 0.05). In Exp. 1, ADG increased linearly (P = 0.02), and GPH decreased linearly (P = 0.0002) as grazing height increased. Methane emission was not affected (P = 0.64) by grazing height. In Exp. 2, ADG was not influenced (P = 0.14) by treatments. However, GPH was the greatest (P < 0.0001) for the SHHS treatment. In addition, CH 4 emissions were lower (P < 0.0001) in SHHS and MHMS bulls compared to THWS. The SHHS Abbreviations: ADF, acid detergent fiber (expressed inclusive of residual ash); aNDF, neutral detergent fiber (assayed with a heat stable amylase and expressed inclusive of residual ash); ADG, average daily gain; AU, animal unit; BW, body weight; CP, crude protein; DM, dry matter; DMB, dry matter basis; DMI, dry matter intake; GPH, gain per hectare; ha, hectare; GE, gross energy; IVOMD, in vitro organic matter digestibility; IVDMD, in vitro dry matter digestibility; MHMS, moderate height and moderate supplementation; ME, metabolizable energy; OM, organic matter; SHHS, short height and high supplementation; THWS, tall height without supplementation.

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“…Ultimately, the increased fibrous forage and decreased digestibility may increase rumination time. Barbero et al (2014) evaluated tropical grazing intensities and found that grazing height can affect canopy structure, chemical composition and consequently affecting animal performance. The increased bite rate of bulls kept in pastures with a lower grazing height can be interpreted as an adaptation mechanism to compensate for the limited availability of the herbage mass (Da Silva et al 2013).…”

Section: Discussionmentioning

confidence: 99%

Supplementation level increasing dry matter intake of beef cattle grazing low herbage height

Barbero

Malheiros

Aguilar

et al. 2020

Journal of Applied Animal Research

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To evaluate the foraging behaviour of yearling bulls grazing on Marandu grass, we conducted two experiments. In the first experiment (Exp. 1), three grazing heights of 15, 25, and 35 cm were evaluated, with bulls receiving 0.3% of body weight (BW) of supplement (161 g kg-1 crude protein (CP) and 20.1 MJ kg-1 gross energy (GE)); in the second experiment (Exp. 2), supplementation levels were decreased as grazing height increased: (1) low height (15 cm) and high supplementation (0.6% BW: 142 g kg-1 CP and 18.9 MJ kg-1 GE (LH-HS)); (2) moderate height (25 cm) and moderate supplementation (0.3% BW: 161 g kg-1 CP and 20.1 MJ kg-1 GE (MH-MS)) or (3) high height (35 cm) without supplementation (HH-WS). Ingestive behaviour was evaluated by direct visual observations, and intake using markers. It was used 9 paddocks each experiment. The experimental design was completely randomized, analysing effects by polynomial orthogonal contrasts (Exp. 1) and Tukey test (Exp. 2). In Exp. 1, a linear decreasing response to daily grazing time (P < 0.01) was observed, whereas a linear increasing response to herbage intake (P < 0.01) was observed with increased grazing height. In Exp. 2, LH-HS bulls had lower herbage intake (P < 0.01) than their counterparts. Bulls from both experiments showed increased grazing activity after 12 PM (P < 0.05). The herbage intake substitution effect of supplements can be explored as a production strategy, as the adjustment of supplementation levels can promote high dry matter intake as well as performance in beef cattle, in conditions of low grazing height or low forage allowance, even with a high stocking rate.

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Desempenho de novilhos de corte em pastos de capim-tanzânia sob quatro alturas de desfolha

Cited by 9 publications

References 11 publications

Animal performance, production, and quality of Tanzania grass fertilized with nitrogen

Animal performance, production, and quality of Tanzania grass fertilized with nitrogen

Combining Marandu grass grazing height and supplementation level to optimize growth and productivity of yearling bulls

Supplementation level increasing dry matter intake of beef cattle grazing low herbage height

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