Comportamento ingestivo de cordeiras em pastagem consorciada de inverno sob diferentes intensidades de desfolha

Glienke, Carine Lisete; Rocha, Marta Gomes da; Confortin, Anna Carolina Cerato; Pötter, Luciana; Costa, Vagner Guasso da; Rossi, Guilherme Ebling

doi:10.1590/s1516-35982008001100003

Cited by 3 publications

(4 citation statements)

References 13 publications

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“…The interval among grazing cycles determined by the thermal sum necessary for the appearance of 2.5 leaves of Italian ryegrass, using a measured phyllochron of 125.08 degree-days (Confortin et al, 2007), allowed a similar recovery of the grass at the different defoliation intensities. The pasture regrowth was also probably related to the joint action of the post-grazing sward light interception efficiency, the organic reserve content of the plants and the interaction between pasture crop and stocking rate (Vickery, 1981).…”

Section: Resultsmentioning

confidence: 99%

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Grazing ecology of female lambs on Italian ryegrass plus red clover pasture under different defoliation intensities

Glienke

Rocha

Camargo³

et al. 2010

R. Bras. Zootec.

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-The relationship between pasture dynamics and ingestive behavior of female lambs was studied on Italian ryegrass (Lolium multiflorum Lam.) plus red clover (Trifolium pratense L.) mixture under a range of defoliation intensities.Rotational grazing was used and the grazing interval was determined by the thermal sum of 313 degree days. The initial pregrazing canopy height disappearance values were 65 (very high), 58 (high), 47 (medium) and 37% (low). The sward vertical structure was similar among defoliation intensities. The forage allowance decreased linearly as defoliation intensities increased, with 0.35 bite/minute reduction for each 1% increase in forage allowance. The bite rate and number of bites/feeding station decreased with reduced contribution of leaves in the sward structure. It was associated, respectively, with an increase and a decrease of NDF and CP levels in forage as grazed by female lambs. The pasture cycle proves to be more important than defoliation intensities as a source for changes in feeding stations and displacement patterns of female lambs.

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Section: Resultsmentioning

confidence: 99%

“…To achieve the intended percentages in each defoliation intensity, the stocking rate (kg/ha body weight) was calculated considering the pre-grazing forage mass (kg/ha DM), number of occupation days and the proportion of 6.0% of body weight (BW) DM disappearance (Glienke et al, 2008).…”

Section: Methodsmentioning

confidence: 99%

Grazing ecology of female lambs on Italian ryegrass plus red clover pasture under different defoliation intensities

Glienke

Rocha

Camargo³

et al. 2010

R. Bras. Zootec.

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“…Assim, com área foliar suficiente, a planta consegue realizar fotossíntese e, consequentemente, transformar os compostos produzidos em matéria verde para a alimentação animal. Trabalhos vêm sendo feitos para avaliar o período de descanso de pastagens de azevém (Pontes et al, 2003;Freitas, 2003;Glienke et al, 2008;Confortini, 2009); porém, para trevo-persa ou para consorciações de trevo-persa e azevém, praticamente não existem trabalhos demonstrando qual o melhor intervalo entre pastejos, nem qual efeito a presença do animal pode causar sobre o pasto. Dessa forma, o presente estudo teve por objetivo avaliar o efeito de intervalos entre pastejos nas características produtivas da consorciação trevo-persa e azevém anual sob lotação rotacionada.…”

Section: Introductionunclassified

Características produtivas da consorciação de trevo-persa e azevém submetidos a pastejo

Sganzerla

Bilharva

Priebe

et al. 2015

Arq. Bras. Med. Vet. Zootec.

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Este estudo teve como objetivo avaliar o efeito de diferentes intervalos entre pastejos sobre as características produtivas de trevo-persa e azevém, consorciados e manejados sob lotação rotacionada, nos anos de 2009 e 2010. Os tratamentos consistiram em quatro intervalos entre pastejos (tempo para o surgimento de 2,5; 3,5; 4,5 e 5,5 folhas em plantas de trevo-persa), em delineamento de blocos completos ao acaso, com seis repetições. As variáveis analisadas foram: índice de área foliar, área foliar, altura do pasto e de plantas, comprimento de perfilhos/ramificações, taxa de acúmulo de matéria seca e produção de matéria seca. O índice de área foliar do dossel e do trevo-persa foi maior no intervalo de 5,5 folhas nos anos de 2009 e 2010. No ano de 2009, maiores valores de área foliar foram obtidos nos intervalos de 3,5 e 4,5 folhas e não se observou efeito dos intervalos entre pastejos sobre essa variável em 2010. Maiores intervalos entre pastejos proporcionaram maior altura do pasto e de plantas e também maior comprimento de perfilhos e ramificações. A produção de matéria seca do trevo-persa foi maior em 2010, ao passo que, para azevém, maior produção foi encontrada em 2009. A produção de matéria seca total foi maior no intervalo de 5,5 folhas. A taxa de acúmulo de matéria seca foi maior no intervalo de 5,5 folhas em 2009 e no intervalo de 2,5 folhas em 2010. As características produtivas da consorciação trevo-persa e azevém anual são modificadas pelos intervalos entre pastejos. Recomendam-se intervalos de até 3,5 folhas surgidas, em consorciação de trevo-persa e azevém anual, os quais proporcionam menor alongamento de caules associado à menor presença de material morto, o que, provavelmente, melhora a qualidade da forragem colhida.

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“…Recent researches evaluated the forage intake of sheep on ryegrass but using the agronomic method (Glienke, Rocha & Confortin, 2008;Roman et al, 2007) and with the double weighing technique (Camargo et al, 2012). These studies did not analyze the relationships with forage allowance nor aimed to determine the better method for the forage intake estimation.…”

Section: Introductionmentioning

confidence: 99%

<b>Methods to determine forage intake by lambs on Italian ryegrass

Rosa

Rocha

Pötter

et al. 2015

Acta Sci. Anim. Sci.

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This study was conducted to evaluate the use of chromium oxide and the content of fecal nitrogen to estimate forage intake by female lambs on Italian ryegrass pasture. The pasture was managed under different forage allowances (FA): 6, 9 and 12% BW. The experiment was a randomized split-split plot design, in which the forage allowances were considered as main plots, the phenological stages as subplots and methods to determine intake as sub-subplots. Forage intake, in the ryegrass vegetative stage, is independent of forage allowance. Lower allowances limit forage intake from the pre-flowering stage, while at the reproductive stage, intake was lower in FA6, intermediate in FA9 and higher in FA12. The estimation of organic matter intake by lambs on Italian ryegrass is similar when chromium oxide and fecal nitrogen are used as markers. The forage intake according to forage allowances depends on the sward structure and is limited by high stem mass at the end of the phenological cycle.

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Comportamento ingestivo de cordeiras em pastagem consorciada de inverno sob diferentes intensidades de desfolha

Cited by 3 publications

References 13 publications

Grazing ecology of female lambs on Italian ryegrass plus red clover pasture under different defoliation intensities

Grazing ecology of female lambs on Italian ryegrass plus red clover pasture under different defoliation intensities

Características produtivas da consorciação de trevo-persa e azevém submetidos a pastejo

<b>Methods to determine forage intake by lambs on Italian ryegrass

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