Dinâmicas de trânsito e degradação da fibra em detergente neutro em bovinos alimentados com forragem tropical de baixa qualidade e compostos nitrogenados

Lazzarini, Ísis; Detmann, Edênio; Sampaio, Cláudia Batista; Paulino, Mário Fonseca; Filho, S. C. Valadares; Souza, Marjorrie Augusto de; Oliveira, Fabrício Marques de

doi:10.1590/s0102-09352009000300017

Cited by 61 publications

(63 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, similar estimates were obtained by Lazzarini (2007), who fed cattle with low-quality tropical forage (Brachiaria decumbens).…”

Section: Resultssupporting

confidence: 76%

“…It must be emphasized that the experimental diet conditions in this work and in the work of Lazzarini (2007) were atypical, where NDF from low-quality forage was basically the only source of carbohydrates for microbial growth, with non-fibrous carbohydrates (NFC) intake below metabolic fecal excretion (Lazzarini, 2007;Sampaio et al, 2009). …”

Section: Resultsmentioning

confidence: 93%

“…In this context, the ruminal conditions in this study and in the work of Lazzarini (2007) could have lead to extreme reduction or elimination of the "carbohydrate effect", which would allow the predominant development of fiber degrading bacteria, without inhibition or competition with NFC degrading bacteria. It could lead to higher degradation rates when compared to normal feed conditions.…”

Section: Resultsmentioning

confidence: 96%

See 2 more Smart Citations

Rumen dynamics of neutral detergent fiber in cattle fed low-quality tropical forage and supplemented with nitrogenous compounds

Sampaio

Detmann²,

Lazzarini

et al. 2009

R. Bras. Zootec.

View full text Add to dashboard Cite

-The aim of this work was to evaluate the effects of supplementation with nitrogenous compounds on rumen dynamics of neutral detergent fiber (NDF) in cattle fed low-quality tropical forage. Five crossbred heifers with average live weight of 180 kg and fitted with rumen cannulae were used. The animals were fed ad libitum with signal grass (Brachiaria decumbens Stapf.) hay, which had crude protein (CP) content of 4.86% of dry matter (DM). The five treatments were proposed in order to raise the CP level of diets to 0, 2, 4, 6, and 8 percentile points above the CP level of the forage. The supplement was a mixture of urea, ammonium sulfate, and albumin (4.5:0.5:1.0, respectively). The experiment was carried out according to a 5 × 5 Latin square design, with five experimental periods. The average CP levels in the diets were: 5. 19, 7.11, 8.60, 11.67, and 13.02% on DM basis. The potentially degradable NDF was linearly increased according to the CP levels in diet up to 6.97% of CP. From this point, there was stabilization of estimates (47.87% of NDF). The degradation rate of potentially degradable NDF was linearly increased with the CP levels in diets. The rumen flow of fibrous particles (L) showed a linear-response-plateau pattern according to the CP levels in diets. The plateau (maximum estimate) began on 7.24% of CP. The mean retention time in the rumen and the rumen fill effect of undegradable NDF were affect by the CP levels similarly to L, with plateau (minimum) beginning on 6.90 and 6.97% of CP, respectively.Key Words: rumen degradation, rumen fill, signal grass, supplementation, urea Dinâmica ruminal da fibra em detergente neutro em bovinos alimentados com forragem tropical de baixa qualidade e suplemento com compostos nitrogenados RESUMO -Objetivou-se avaliar os efeitos da suplementação com compostos nitrogenados sobre a dinâmica ruminal da fibra em detergente neutro (FDN) em bovinos alimentados com forragem tropical de baixa qualidade. Foram utilizadas cinco novilhas mestiças Holandês × Zebu, com peso vivo médio inicial de 180 kg, fistuladas no rúmen. A alimentação volumosa basal dos animais foi constituída por feno de capim-praquiátia (Brachiaria decumbens Stapf) (4,86% de PB, com base na MS), fornecido à vontade. Os cinco tratamentos avaliados foram definidos de acordo com o nível de suplementação protéica (0, 2, 4, 6 e 8 pontos percentuais acima do nível de PB da forragem, utilizando-se como fonte de compostos nitrogenados mistura de uréia, sulfato de amônia e albumina, nas proporções de 4,5:0,5:1,0, respectivamente. O experimento foi constituído de cinco períodos experimentais, segundo delineamento em quadrado latino 5 × 5. Os níveis médios de PB nas dietas foram de 5,19; 7,19; 8,60; 11,67 e 13,02%, com base na MS. Verificou-se elevação linear da fração potencialmente degradável da FDN até o nível de 6,97% de PB, com platô estimado de 47,87% da FDN. A taxa de degradação da fração potencialmente degradável da FDN aumentou linearmente com os níveis de PB da dieta. O fluxo ruminal de partículas fibr...

show abstract

“…However, similar estimates were obtained by Lazzarini (2007), who fed cattle with low-quality tropical forage (Brachiaria decumbens).…”

Section: Resultssupporting

confidence: 76%

Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 96%

See 1 more Smart Citation

Rumen dynamics of neutral detergent fiber in cattle fed low-quality tropical forage and supplemented with nitrogenous compounds

Sampaio

Detmann²,

Lazzarini

et al. 2009

R. Bras. Zootec.

View full text Add to dashboard Cite

show abstract

“…However, recent studies, e.g., Lazzarini et al (2009), suggest that CP content below 8% limit fiber degradation in the rumen due to the reduction of cellulolytic bacteria. The increase in NDF and ADF contents might be a consequence of the reduction in NCE, and the high flowering rate of the grass, owing likely to the reduction in metabolism of the grass in an attempt to extend its lifetime.…”

Section: Resultsmentioning

confidence: 99%

Agronomic and nutritional characteristics of Massai grass subjected to deferred grazing and nitrogen fertilization

Costa

Rodrigues

Araújo

et al. 2017

SCA

View full text Add to dashboard Cite

This study aimed to evaluate the agronomic characteristics and nutritional value of Massai grass (Megathyrsus maximus 'Massai') pastures fertilized with different nitrogen levels and subjected to deferred grazing. A completely randomized experimental design (CRD) was adopted, with including five nitrogen levels (zero, 100, 200, 300, and 400 kg ha −1 ), and five replications (plots). The degradability trial used a CRD including a 6 × 5 factorial arrangement, consisting of six rumen-incubation times (6, 24, 48, 60, 84, and 96 h) and five levels of nitrogen in different plots. One fistulated sheep, with a live weight of 60 kg, was used in the experiment. Total herbage biomass, dead herbage biomass, and height showed a quadratic response to nitrogen fertilization levels of 100 to 200 kg ha -1 resulted in greater tillering. Protein and dry matter content increased linearly with nitrogen fertilization level, leading to increase in fibrous components. The increase in NDF and ADF contents might be a consequence of the reduction in NCE, and the high flowering rate of the grass, owing likely to the reduction in metabolism of the grass in an attempt to extend its lifetime. Nitrogen levels of 300 kg ha −1 or higher affected the productive characteristics positively, whereas the chemical characteristics were negatively affected. Key words: Deferred period. Degradability of dry matter. Megathyrsus. Nitrogen fertilization. ResumoObjetivou-se avaliar as características agronômicas e valor nutritivo do capim-Massai (Megathyrsus maximus 'Massai') submetido a diferimento e doses crescentes de nitrogênio. O delineamento experimental adotado foi o inteiramente casualizado (DIC) com cinco doses de nitrogênio (zero, 100; 200; 300 e 400 kg de N ha -1 ) com cinco repetições (parcelas). O ensaio de degradabilidade foi estruturado em DIC, com arranjo fatorial 6x5, seis tempos de incubação no rúmen (6, 24, 48, 60, 84 e 96 h) e cinco doses de N em parcelas diferidas. Utilizou-se um ovino fistulado com peso vivo de 60 kg. A biomassa de forragem total, morta e a altura respondeu à adubação nitrogenada de forma quadrática. A adubação nitrogenada nas doses 100 a 200 kg de N ha -1 proporcionou maior perfilhamento. A adubação nitrogenada proporcionou resposta linear sobre os teores de proteína e matéria seca em consequência também aumentou os constituintes fibrosos. O amento dos teores de FDN e FDA pode ser uma consequência da redução da ECN e da taxa de florescimento da gramínea, devido provavelmente à redução no metabolismo na tentativa de prolongar sua vida útil. A partir da dose de 300 kg de N ha -1 resultou em redução da degradação da matéria seca do capim-Massai. As doses de N influenciaram positivamente as características produtivas e negativamente as características químicas. Palavras-chave: Adubação nitrogenada. Degradabilidade da MS. Megathyrsus. Período de diferimento.

show abstract

“…Table 3 -average intake of pasture and supplement nutrients and digestibility of DM and NDFacp weight gain (17.6 kg) higher than the non-supplemented animals (6.9 kg) (Table 4). According to Lazzarini (2007), dietary levels of crude protein above 8.55% provide sufficient microbial growth that do not harm the digestibility of potentially degradable neutral detergent fiber. As the close value of crude protein showed by B. decumbens (8.31%) in this work, there was no significant differences (P>0.10) in NDFacp digestibility for supplemented animals in comparison to non-supplemented animals (Table 3).…”

Section: Resultsmentioning

confidence: 99%

Energy sources and supplementation levels for beef heifers raised during the dry season

Couto¹,

Paulino²,

Detmann³

et al. 2010

R. Bras. Zootec.

View full text Add to dashboard Cite

-This experiment aimed at evaluating the productive performance, intake and the apparent digestibility in the raising of beef heifers on Brachiaria decumbens Stapf. pastures under supplementation with starch or fibrous energy sources during the dry season. It was used 40 newly weaned heifers (20 Nellore and 20 crossbreed), at 8.5 months of age and 197.9 ± 3.74 kg initial weight. Two supplements were formulated: the first was corn meal-and soybean meal-based diet (high in starch) and the second was based on wheat meal (high in fiber), which were given at the quantities of 0.5 or 1.0 kg/animal/day, compared to the offer of only mineral mixture (control). The animals were distributed according to a complete randomized block design in a 2 × 2 + 1 factorial arrangement with two sources of energy and two levels of supplementation plus the control treatment; the genetic group was used as a measure of local control. The average daily weight gain was higher for the animals under supplementation than those fed only mineral mixture (0.198 vs. 0.077 kg/animal/day).Moreover, performance of the animals under supplementation with starch energy source was higher than those fed wheat Além disso, o desempenho dos animais sob suplementação com fonte amilácea de energia foi maior em relação aos daqueles que receberam suplemento à base de farelo de trigo (0,232 vs 0,163 kg/animal/dia). O consumo de matéria seca de pasto foi menor no grupo que recebeu o maior nível de suplementação. A suplementação de novilhas de corte sob pastejo durante o período da seca possibilita aumentar o desempenho produtivo. Em comparação ao farelo de trigo, a utilização da mistura milho/farelo de soja como base da mistura múltipla melhora o desempenho produtivo das novilhas.Palavras-chave: bezerras, Brachiaria decumbens, farelo de trigo, pastagem Revista Brasileira de Zootecnia

show abstract

Dinâmicas de trânsito e degradação da fibra em detergente neutro em bovinos alimentados com forragem tropical de baixa qualidade e compostos nitrogenados

Cited by 61 publications

References 17 publications

Rumen dynamics of neutral detergent fiber in cattle fed low-quality tropical forage and supplemented with nitrogenous compounds

Rumen dynamics of neutral detergent fiber in cattle fed low-quality tropical forage and supplemented with nitrogenous compounds

Agronomic and nutritional characteristics of Massai grass subjected to deferred grazing and nitrogen fertilization

Energy sources and supplementation levels for beef heifers raised during the dry season

Contact Info

Product

Resources

About