Produção e composição do leite de vacas mantidas em pastagens de capim-elefante submetidas a duas frequências de pastejo

Voltolini, Tadeu Vinhas; Santos, Flávio Augusto Portela; Martinez, Júnio César; Imaizumi, Hugo; Clarindo, Rafael Luis; Penati, Marco Antonio

doi:10.1590/s1516-35982010000100016

Cited by 22 publications

(18 citation statements)

References 13 publications

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“…The levels of milk solids (Table 4) agree with those reported by Voltolini et al (2010), who evaluated different grazing management systems of elephant grass and found similar results for fat (39.8 and 37.5 g kg −1 ) and protein content (32.3 and 30.8 g kg −1 ). The milk protein contents obtained for Marandu and Mulato II are equivalent to those achieved in elephant grass pastures, indicating the potential of the former to be used in pasture-based milk production systems.…”

Section: Discussionsupporting

confidence: 87%

“…In addition, Mulato II grass had a higher CP and lower lignin content than Marandu grass and is, therefore, considered to have a better nutritive value. The milk yields obtained agree with the milk production of pasture systems using tropical grasses such as elephant grass (Pennisetum purpureum), ranging from 14.09 to 16.72 kg cow −1 day −1 (Voltolini et al, 2010) and from 18.5 to 15.5 kg cow −1 day −1 (Congio et al, 2018), and Mombasa grass (Panicum maximum Jacq. cv.…”

Section: Discussionsupporting

confidence: 67%

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Milk production and ingestive behavior of cows grazing on Marandu and Mulato II pastures under rotational stocking

et al. 2019

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The objective of this study was to evaluate milk production and ingestive behavior of Holstein cows and the structural characteristics of Mulato II, a hybrid Brachiaria grass CIAT 36087 (B. ruziziensis × B. decumbens × B. brizantha), and Marandu (Brachiaria brizantha cv. Marandu) pastures under rotational stocking. The experiment was conducted from December 2011 to April 2012 after 10 months of adaptation to the grazing management objectives (25 cm pre-grazing height and 15-20 cm post-grazing height). An area of 4 ha was divided into 28 paddocks: 14 with Mulato II pasture and 14 with Marandu pasture. The treatments consisted of the two grasses and a completely randomized design of the grazing variables with six repetitions each (paddock of evaluation) was used. For the animal variables, a randomized matched pairs design of 20 Holstein cows forming 10 blocks of two animals with similar production each was used. The forage mass or accumulation rate did not differ between grasses. Mulato II pastures had a higher tiller population density (822 tillers m −2 ) and crude protein content (143.5 g kg −1 ) than Marandu pastures (636 tillers m −2 and 130.3 g kg −1 crude protein). Cows kept on Mulato II exhibited shorter nighttime grazing activity (234 and 246 min in summer and autumn, respectively) than animals kept on Marandu (273 and 394 min, respectively). The average milk yield during the experimental period was higher for Mulato II (15.3 kg cow −1 day −1 ) compared with Marandu (14.3 kg cow −1 day −1 ). Both grasses have potential to be used in milk production systems for the grazing management objectives evaluated.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionsupporting

confidence: 67%

Milk production and ingestive behavior of cows grazing on Marandu and Mulato II pastures under rotational stocking

et al. 2019

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“…Hereafter, the four treatments are designated 90/50, 90/70, 120/50, and 120/70. The choice of a pre-grazing height of 90 cm was based on data from two other elephant grass cultivars, Cameroon and Napier, that also have a large leaf mass at heights of 100 and 85 cm, respectively (Voltolini et al 2010, Pereira et al 2014. The height of 120 cm was chosen to test pasture management that promotes taller sward, such as that commonly used by local farmers, which generally results in a lower proportion of leaves and a higher proportion of stems and dead material.…”

Section: Methodsmentioning

confidence: 99%

Fatty acid profile in vertical strata of elephant grass subjected to intermittent stocking

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Schmitt

Rodolfo

et al. 2017

An. Acad. Bras. Ciênc.

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The milk and meat from animals with a pasture-based diet have higher proportions of CLA and C18:3 and lower omega-6:omega-3 ratios than products from animals with diets based on corn silage and concentrate. However, most of the published studies have evaluated fatty acid profiles in temperate climate grasses and the literature with tropical grasses is scarce. Thus, the aim of this study was to evaluate the morphological and fatty acid compositions in the vertical strata of elephant grass (Pennisetum purpureum Schum.) swards subjected to grazing heights (90 or 120 cm pre-grazing heights) and levels of defoliation (50% or 70% removal of the initial pre-grazing height). There were no interactions among pre-grazing height, the level of defoliation and grazing stratum. However, higher proportion of C18:3 (58% and 63%) was found in the 90-cm swards and in the half upper stratum. A higher proportion of C18:3 was associated with a higher leaf proportion and crude protein content. Thus, the upper stratum of sward or a grazing management scheme (e.g. first-last stocking) resulting in a higher proportion of leaves and crude protein both provide higher proportions of C18:3 to animals grazing in elephant grass swards.

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“…dossel forrageiro (Carnevalli et al, 2006;Voltolini et al, 2010), dependendo das condições experimentadas pela planta durante o período de descanso. Isso pode prejudicar a produção, a qualidade e a eficiência de colheita da forragem pelos animais em pastejo (Cândido et al, 2005).…”

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Características produtivas e qualitativas do capim-elefante pastejado em intervalo fixo ou variável de acordo com a interceptação da radiação fotossinteticamente ativa

et al. 2010

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RESUMO -Objetivou-se avaliar dois intervalos de pastejo de pastos de capim-elefante (Pennisetum purpureum Schum.): um intervalo variável, quando o dossel atingisse 95% de interceptação da radiação fotossinteticamente ativa, e um intervalo de pastejo fixo, de 26 dias. O delineamento experimental foi o inteiramente casualizado com medidas repetidas no tempo.O intervalo de pastejo, a altura do dossel no pré e pós-pastejo, a interceptação da radiação fotossinteticamente ativa e o índice de área foliar foram maiores quando aplicado o intervalo de pastejo fixo. Não houve efeito dos intervalos de pastejo sobre as massas de forragem, de folhas e de colmos no pré e pós-pastejo nem sobre a densidade volumétrica do dossel no pré-pastejo. A massa de material morto foi menor no intervalo de pastejo variável em comparação ao intervalo fixo, tanto no pré quanto no pós-pastejo. Os teores de fibra em detergente neutro e fibra em detergente ácido nos pastos manejados em intervalo variável foram menores que naquela com intervalo fixo. A aplicação de intervalo de pastejo variável, por permitir redução do tempo de descanso do pasto, tem efeitos positivos na qualidade da forragem.Palavras-chave: interceptação de luz, lotação rotacionada, manejo do pastejo, Pennisetum purpureum, período de descanso, valor nutritivo Productive and qualitative characteristics of elephant grass pasture grazed in fixed and intermittent intervals according to interception of active photosynthetic radiation ABSTRACT -The objective of this trial was to evaluate two intervals of grazing on elephant grass (Pennisetum purpureum Schum.) pasture. It was tested a variable grazing interval when it was observed an interception of 95% of active photosynthetic radiation by sward, and a 26-day fixed grazing interval. The experimental design was a complete randomized design with time repeated measurements. The interval of grazing, pre and post grazing sward heights, sward interception of active photosynthetic radiation and leaf area index were greater when the fixed pasture interval was applied. There was no effect of intervals of grazing on forage mass, leaf mass and stem mass in pre-or post-grazing neither for sward volumetric density in pre grazing. Dead material mass was lower for variable grazing interval than in fixzed grazing for both pre and post grazing. Neutral detergent fiber and acid detergent fiber contents were lower in the grazing managed in the variable interval than in the fixed grazing interval. The use of variable grazing interval intervals that promoted reduction in resting time of the pasture resulted in positive effects on forage quality.Key Words: chemical composition, interval between grazing, light interception, pasture management, Pennisetum purpureum, rotational grazing IntroduçãoO crescimento da planta forrageira é determinado pelas condições genéticas e ambientais (fertilidade do solo, características climáticas, etc), que podem potencializar ou limitar a produção de forrragem.Assim, o estabelecimento do ciclo de pastejo em dias fixos pode p...

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Produção e composição do leite de vacas mantidas em pastagens de capim-elefante submetidas a duas frequências de pastejo

Cited by 22 publications

References 13 publications

Milk production and ingestive behavior of cows grazing on Marandu and Mulato II pastures under rotational stocking

Milk production and ingestive behavior of cows grazing on Marandu and Mulato II pastures under rotational stocking

Fatty acid profile in vertical strata of elephant grass subjected to intermittent stocking

Características produtivas e qualitativas do capim-elefante pastejado em intervalo fixo ou variável de acordo com a interceptação da radiação fotossinteticamente ativa

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