O capim-marandu baixo no início do diferimento melhora a morfologia do pasto e aumenta o desempenho dos ovinos no inverno

Afonso, L.E.F.; Santos, Manoel Eduardo Rozalino; Silva, S.P.; Rêgo, Aníbal Coutinho do; Fonseca, Dilermando Miranda da; Carvalho, Bruno Humberto Rezende

doi:10.1590/1678-4162-10130

Cited by 12 publications

(29 citation statements)

References 18 publications

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“…Regarding the grazing period, this factor influenced, the following characteristics: CP, pdDM, iNDF contents, DM, CP and NDF intake, as well as DM digestibility (Table 3). At the beginning of the grazing period, there were higher content of pdDM, CP and DM digestibility (DDM) in the simulated grazing samples (Table 2; P<0.10) which were due to the higher percentage of live leafe and lower percentage of dead stem in these samples during the beginning of the grazing period, as verified by Afonso et al (2018) in a simultaneous study carried out in the same experimental area. During the period of use deferred pastures, in the winter, climatic conditions (temperature, photoperiod and, mainly, water availability) are limiting to pasture growth (Table 1).…”

Section: Resultsmentioning

confidence: 52%

“…Thus, deferred pastures with lower heights had better morphological composition. In this sense, Afonso et al (2018), in a study conducted concurrently in the same experimental area, verified that 15 and 25 cm deferred pastures had a higher percentage of live leaves in the simulation grazing samples, compared to the 35 cm 45 cm deferred pastures. Corroborating this, Santos et al (2008) also reported a negative correlation between dead stem mass and pdDM content (-0.85), but the correlation was positive between live leaf blade mass and pdDM content (+0.94) in deferred signalgrass (Brachiaria decumbens cv.…”

Section: Resultsmentioning

confidence: 68%

“…These results occurred because at the beginning of grazing period there was a greater mass of forage available and, indeed, superior forage allowance for animal grazing. Additionally, at the beginning of the grazing period, the pastures also contained a higher percentage of live leaves, which was found by Afonso et al (2018). These better quantitative and structural characteristics of deferred pastures at the beginning of the grazing period probably facilitated the forage seizure process by the animal during grazing (Trindade et al, 2007) and, in effect, resulted in higher DM and CP intake (Table 3).…”

Section: Resultsmentioning

confidence: 70%

“…Furthermore, the high DMI at the beginning of the grazing period, due to greater forage allowance with more live leaves, by itself, also justifies the higher NDF intake in this period. At the end of this period, pastures had higher percentage of dead stem, as identified by Afonso et al (2018) in a study carried out simultaneously in the same experimental area; as this morphological component has higher NDF content, this caused greater NDF intake. Accordingly, M.E.…”

Section: Resultsmentioning

confidence: 77%

“…In this scenario, so that the deferred pastures do not present elevated forage mass with limited nutritional value, it has been recommended to reduce the sward height, to adopt intense grazing of shortly duration, in initial deferment period the pasture, with less demanding animal categories (Afonso et al, 2018). With that, the removal of old forage with low quality, and the increased incidence of light on the base of plants stimulate the appearance of new tillers (Santana et al, 2014;Carvalho, Pereira, Sbrissia, Rocha, & Santos, 2021).…”

Section: Introductionmentioning

confidence: 99%

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Intake and digestibility of nutrients during the grazing period in sheep on deferred marandu pastures with four initial heights

Silva¹,

Fonseca²,

Oliveira³

et al. 2021

Semina: Ciênc. Agrár.

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The objective of this study was to verify the effect of reducing in pasture height at the beginning of the deferment period (PHBD) of Brachiaria brizantha cv. Marandu on nutrient intake and digestibility in sheep during winter. The combinations between average sward heights (15, 25, 35 and 45 cm) at the beginning of the deferment period and the times of sward use during the winter were evaluated; intake and digestibility evaluations were carried out at the beginning, middle and end of the grazing period, which lasted 90 days. The experimental design used was completely randomized, with three replications. The parameters evaluated were: intake and digestibility of dry matter (DM), crude protein (CP) and neutral detergent fiber (NDF) and potentially digestible dry matter (pDDM). The pDDM contents were similar in pastures kept with 15 and 25 cm, but higher than those observed in pastures with 35 and 45 cm at the beginning of the deferment period. The NDF contents were lower and the CP and NDF digestibility were higher in 15 and 25 cm deferred pastures than in 35 cm at the beginning of deferment period, except for pastures lowered to 45cm. The improvement in nutritional value of the forage apparently ingested by sheep, promoted by ISP reduction, did not result in a variation in pasture consumption by the animals. DMI, expressed as percentage of body weight (%BW), ranged from 1.10 to 1.63. At the beginning of the grazing period, higher values of pDDM, CP and DM digestibility (DMD) were verified in simulated grazing samples. The same response pattern observed for nutritional value traits also occurred for DMI (g.day-1 and %BW) and CP intake. These were higher at the beginning, than at the middle and end of the grazing period. The use of lower sward heights at the beginning of the deferment period allowed the production of pasture with better nutritional quality, but these changes in the nutritional value of the pasture were insufficient to result in higher nutrient intake and digestibility. Furthermore, there was a reduction in nutritional value of the forage apparently consumed by sheep, in the intake and digestibility of deferred pastures throughout the grazing period, in winter. The lower pastures at the beginning of the deferment period (15 cm) improves the nutritional value of forage and nutrient digestibility at the beginning of the winter grazing period. The nutritional value and intake of deferred forage by sheep are compromised by the grazing period.

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Section: Resultsmentioning

confidence: 52%

Section: Resultsmentioning

confidence: 68%

Section: Resultsmentioning

confidence: 70%

Section: Resultsmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

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Intake and digestibility of nutrients during the grazing period in sheep on deferred marandu pastures with four initial heights

Silva¹,

Fonseca²,

Oliveira³

et al. 2021

Semina: Ciênc. Agrár.

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Leaves per tiller as the criterion to determine optimum defoliation frequency in pastures of Brachiaria decumbens

Luna

Fornaguera

2020

Rev. Fac. Nac. Agron. Medellín

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Two studies were performed to establish the best defoliation frequency in Brachiaria decumbens using the number of leaves per tiller as a criterion. In the first study, 3,500 tillers with 2, 3, 4, 5, or 6 leaves were collected in 10 farms. The number of green, senescent, and dead leaves was counted. A pooled sample of tillers by each farm with a given number of leaves was analyzed for nutritional quality; a complete randomized block design was used for this study. In a second study, it was implemented a complete ramdomized design with repeated measures over time (2 defoliations), and the effect of defoliating B. decumbens at 3, 4, or 5 leaves per tiller on its growth, dry matter yield, and nutritional quality were evaluated. In the first study, all leaves remained green until the tiller had 3 leaves. At the fourth leaf, few tillers (2.3%) had senescent leaves, but at 6 leaves, most tillers had senescent (40.6%) or dead (24.4%) leaves. Crude protein and digestibility decreased as the number of leaves in a tiller increased (P<0.001). In the second study, the rate of dry matter accumulation was the highest for plots defoliated at 4 leaves (P<0.05). Green stems (43.9%) represented a larger proportion of dry matter than green leaves (31.4%), and their proportions were similar among treatments. Crude protein and digestibility of stems decreased as the number of leaves per tiller increased (P<0.001), but the quality of leaves was similar. These findings suggest that these pastures should be defoliated at 4 leaves per tiller.

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Does the lowering strategy before the stockpiling period modify the marandu palisade grass production and structure?

Santos

Rocha

Carvalho

et al. 2021

Arq. Bras. Med. Vet. Zootec.

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The objective was to identify lowering strategies for Urochloa brizantha cv. Marandu in the beginning of the stockpiling period that increase forage production and improve the structure of stockpiled canopies. Three lowering strategies were evaluated: maintenance of marandu palisade grass with 15cm four months before the stockpiling period; maintenance of palisade grass with 30cm for four months, and lowering to 15cm before the stockpiling period; and maintaining of palisade grass at 45cm for four months, and lowering to 15cm before the stockpiling period. The experimental design was completely randomized, with four replications. At the end of stockpiling, the number of reproductive tillers and forage mass were higher in the canopy under 15/15cm than in the others; the percentage of live leaf was higher in the canopy under 45/15cm than under 15/15cm. Forage production during the stockpiling period was higher in the canopy under 15/15cm and lower in the under 45/15cm. Maintaining 15cm marandu palisadegrass for four months before the stockpiling period increases forage production during this period. The lowering of the marandu palisadegrass from 45 to 15cm at the beginning of the stockpiling period improves the structure of the stockpiled canopy.

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O capim-marandu baixo no início do diferimento melhora a morfologia do pasto e aumenta o desempenho dos ovinos no inverno

Cited by 12 publications

References 18 publications

Intake and digestibility of nutrients during the grazing period in sheep on deferred marandu pastures with four initial heights

Intake and digestibility of nutrients during the grazing period in sheep on deferred marandu pastures with four initial heights

Leaves per tiller as the criterion to determine optimum defoliation frequency in pastures of Brachiaria decumbens

Does the lowering strategy before the stockpiling period modify the marandu palisade grass production and structure?

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