Predição do consumo de pasto de capim-elefante (Pennisetum purpureum, Schumack) por vacas mestiças Holandês x Zebu em lactação

Lopes, Fernando César Ferraz; Aroeira, Luiz Januário Magalhães; Rodríguez, N. M.; Sampaio, Ivan Barbosa Machado; Deresz, F.; Borges, I.; Berchielli, Telma Teresinha

doi:10.1590/s1516-35982005000300035

Cited by 6 publications

(3 citation statements)

References 19 publications

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“…These results corroborate the theory of Lucas and Smart (1959), which states that if a fraction of the food has uniform nutritional behavior, then subfractions that compose it will behave similarly. The solid-phase passage rates observed in the literature are generally between 0.02 and 0.08 h −1 (AFRC, 1993); similar values were published by Lopes (2002) for lactating Gir or crossbred Holstein × Zebu cows grazing on tropical forages (Table 4).…”

Section: Resultssupporting

confidence: 64%

Nutritive value of Tanzania grass for dairy cows under rotational grazing

et al. 2014

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-A nutritional analysis of Tanzania grass (Megathyrsus maximus Jacquin cv. Tanzânia was conducted. Pasture was managed in a rotational grazing system with a 30-day resting period, three days of paddock occupation and two grazing cycles. Ten Holstein × Zebu crossbred cows were kept within a 2-ha area divided into 11 paddocks ha -1 . Cows were fed 2 kg of corn meal daily and performance was evaluated by weighing the animals every 14 days and by recording milk production twice a day. Nutritional composition of the Tanzania grass was determined from forage (extrusa) samples collected by esophageal fistulae from two animals. The nutritive value of Tanzania grass was estimated according to a modification of the CNCPS evaluation model. Tanzania grass supplemented with 2 kg of corn meal supplied 33.2% more net energy for lactation than required by the animals to produce 13.7 kg of milk day -1 . Nevertheless, the amount of metabolizable protein met the daily protein requirement of the animals. Although the model used in the study requires adjustments, Tanzania grass has the potential to produce milk in a rotational grazing system.

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Section: Resultssupporting

confidence: 64%

Nutritive value of Tanzania grass for dairy cows under rotational grazing

et al. 2014

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“…Nevertheless, both treatments were within the range reported by Lopes (2002). Among the maize silage hybrids (Table 3), differences (P < 0.05) between the analysis systems were observed in eight of the maize silage hybrids.…”

Section: Determination Of Adf Contentsupporting

confidence: 70%

Comparative efficacy of the conventional and automated methods for determining neutral and acid detergent fiber

et al. 2016

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Different methods are available to determine fiber content in feeds. However, information about the accuracy of this methods for neutral detergent fiber (NDF) and acid detergent fiber ADF contents estimation (obtained with the use of TNT-100 nylon filtering bags) is very limited related to the large number of ruminant feed analysis. The purpose of this study was to compare the efficacy of the automated and conventional Van Soest methods to determine NDF and ADF contents for bovine cattle and feed supplements. Four classes of samples (tropical forage, maize silage hybrid, concentrated supplements and bovine cattlecattle) were evaluated for NDF and ADF contents using conventional and automated methods. Analysis involved a hierarchical factorial scheme with an entirely randomized design executed with repetitions. It was concluded that the automated method procedure generated similar results when compared to the conventional method for the determination of NDF contents in tropical forage, bovine cattle and maize silage samples, although is not recommended for samples with a high starch content. This system was not efficient for ADF determination in the evaluated samples.

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“…Resultados semelhantes foram observados por Lopes et al (2000), cujos coeficientes de determinação para este parâmetro variaram de 0,35 a 0,40, e contrários aos observados por Teixeira et al (2003), em que o valor de R 2 para essa variável foi de 0,61. Segundo Lopes et al (2005), os métodos de estimativa visual, por meio do uso da altura das plantas, como atributos para determinar a produção de matéria seca em capim-elefante manejado sob pastejo, é bastante adequado por se tratar de um método prático, além de não destrutivo, de fácil utilização, não exigir o uso de instrumentos sofisticados e, principalmente, apresentar alta confiabilidade. Porém, quando se associou a altura média das plantas com solo descoberto, os coeficientes de regressão foram baixos e não significativos (P>0,05).…”

Section: Resultsunclassified

Métodos de avaliação de disponibilidade de forragem em clones de Pennisetum sp. sob pastejo

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Lira

et al. 2007

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Métodos de avaliação de disponibilidade de forragem em clones de Pennisetum sp. sob pastejo 1 RESUMO O objetivo do trabalho foi comparar diferentes métodos de estimativa de disponibilidade de forragem em clones de Pennisetum sp. sob pastejo. O delineamento experimental foi o de blocos ao acaso, com cinco repetições e 16 tratamentos (clones de Pennisetum sp.). As parcelas mediam 5 x 5 m. Foram utilizados os seguintes métodos para estimativa de disponibilidade de forragem: método direto, dupla amostragem, altura média das plantas, % de solo descoberto, e a associação da altura com solo descoberto, em três avaliações. Os dados foram submetidos a análise de variância e as médias comparadas pelo teste de Tukey a 5% de probabilidade. Os menores coeficientes de variação observados foram para o método altura média das plantas, tanto no período chuvoso (23,16%), quanto no período seco (29,67%). Esses coeficientes, associados a altos coeficientes de determinação (R 2 ) de 0,78 e 0,74, para os períodos chuvoso e seco, respectivamente, permitem indicar a altura média das plantas como o método mais adequado para avaliação da disponibilidade de forragem em capimelefante sob pastejo.Palavras-chave: altura, capim-elefante, dupla amostragem, produção, solo descoberto Methods of evaluation of forage availability in clones of Pennisetum sp. under grazing ABSTRACTThe study aimed to evaluate different methods to estimate forage availability in clones of Pennisetum sp. under grazing. The experimental design was completely randomized complete blocks, with five replications and 16 treatments. Each plot measured 5 x 5 m. The following methods were used to estimate forage availability: direct method, double sampling, average plant height, uncovered ground percentage, and the association of height and uncovered ground. The data were submitted to analysis of variance and the averages compared by the test of Tukey at 5% probability. The smallest coefficients of variation were observed for average plant height in the rainy period (23.16%) and in the dry period (29.67%). These coefficients, associated with high determination coefficients (R 2 ) of 0.78 and 0.74, for the rainy and dry periods, respectively, allow to indicate the mean height of the plants as the most appropriate method for evaluation of the forage availability in elephant-grass.

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Predição do consumo de pasto de capim-elefante (Pennisetum purpureum, Schumack) por vacas mestiças Holandês x Zebu em lactação

Cited by 6 publications

References 19 publications

Nutritive value of Tanzania grass for dairy cows under rotational grazing

Nutritive value of Tanzania grass for dairy cows under rotational grazing

Comparative efficacy of the conventional and automated methods for determining neutral and acid detergent fiber

Métodos de avaliação de disponibilidade de forragem em clones de Pennisetum sp. sob pastejo

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