Digestibilidade e parâmetros ruminais de bovinos consumindo brachiaria brizantha cv. Marandu

This experiment aimed to evaluate nutrient intake, total and partial digestibility of dry matter (DM), organic matter (OM), crude protein (CP), neutral (NDF) and acid (ADF) detergent fiber and ruminal parameters, ammonia concentration and volatile fatty acids, in beef cattle fed palisade grass (Brac...

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Published in:Archivos de zootecnia Vol. 60; no. 232; pp. 997 - 1008
Main Authors: Malheiros, E.B, Ruggieri, A.C, Queiroz, M.F.S, Messana, J.D, Morais, J, Berchielli, T. T
Format: Journal Article
Language:Portuguese
Published: 2011
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Abstract This experiment aimed to evaluate nutrient intake, total and partial digestibility of dry matter (DM), organic matter (OM), crude protein (CP), neutral (NDF) and acid (ADF) detergent fiber and ruminal parameters, ammonia concentration and volatile fatty acids, in beef cattle fed palisade grass (Brachiaria brizantha cv. marandu) at two regrowth ages, 30 and 60 days, at two times of year (January and February). The intake of DM, OM and CP was influenced by forage age of regrowth with high values for 30 days; this was influenced by time of year, being observed in February the higher intake by animals. DM digestibility average was 60.7 and 59.4% for 30 and 60 days of forage regrowth, respectively, however, was observed effect of interaction between regrowth and time of year, the same comportment was observed for OM, averages were 63.9 and 63% for respective ages of regrowth. CP digestibility was higher for 30 days, 70.8%, than for 60 days of regrowth, 57%. The NDF and ADF digestibilities were influenced by the interaction between regrowth and time of year; their average for 60 days of regrowth in January were respectively 54.8 and 48.5%, being the lower values and, in February, the higher values: 64.9 and 60.4%. The ruminal average digestibility was 79.5, 86.2, 99.4 and 96.7% of the total degradable for DM, OM, NDF and ADF, respectively. Effects of regrowth and time of year there were not recorded. Two hours after the morning meal was observed the ammonia ruminal concentration peak. The acetate:propionate: butirate ruminal ratio observed was 74:18:8(%). O consumo e digestibilidades total e parcial da matéria seca (MS), matéria orgânica (MO), proteí- na bruta (PB), fibras em detergente neutro (FDN) e ácido (FDA) e os parâmetros ruminais nitrogênio amoniacal e ácidos graxos de cadeia curta foram avaliados em bovinos de corte alimentados com Brachiaria brizantha cv. marandu aos 30 e 60 dias de rebrota em duas épocas do ano (janeiro e fevereiro). Os consumos de MS, MO e PB foram influenciados pela idade de rebrota da forrageira apresentando maiores valores aos 30 dias e também influenciados pela época do ano, sendo em fevereiro seu maior consumo pelos animais. A digestibilidade da MS foi em média 60,7 e 59,4% aos 30 e 60 dias de rebrota da forrageira, respec- tivamente, porém, demonstrou efeito de interação entre a idade de rebrota e a época do ano, mesmo comportamento observado para MO, com médias de 63,9 e 63% para as respectivas idades de rebrota. A digestibilidade da PB foi maior aos 30 dias de rebrota, média de 70,8%, que aos 60 dias, média de 57%. As digestibilidades da FDN e da FDA com efeito significativo para a interação entre a idade de rebrota e a época do ano, apresentaram aos 60 dias de rebrota na época de janeiro as menores médias, 54,8 e 48,5%, respectivamente e em fevereiro as maiores médias, 64,9 e 60,4%. A digestibilidade ruminal apresentou médias de 79,5, 86,2, 99,4 e 96,7% do total digerível para MS, MO, FDN e FDA, respectivamente, não sendo observados efeitos da idade de rebrota nem da época do ano. Após 2 horas da alimentação foi observado o pico de concentração de nitrogênio amoniacal no rúmen. A média da relação acetato:propionato:butirato observada foi 74:18:8(%).
AbstractList This experiment aimed to evaluate nutrient intake, total and partial digestibility of dry matter (DM), organic matter (OM), crude protein (CP), neutral (NDF) and acid (ADF) detergent fiber and ruminal parameters, ammonia concentration and volatile fatty acids, in beef cattle fed palisade grass (Brachiaria brizantha cv. marandu) at two regrowth ages, 30 and 60 days, at two times of year (January and February). The intake of DM, OM and CP was influenced by forage age of regrowth with high values for 30 days; this was influenced by time of year, being observed in February the higher intake by animals. DM digestibility average was 60.7 and 59.4% for 30 and 60 days of forage regrowth, respectively, however, was observed effect of interaction between regrowth and time of year, the same comportment was observed for OM, averages were 63.9 and 63% for respective ages of regrowth. CP digestibility was higher for 30 days, 70.8%, than for 60 days of regrowth, 57%. The NDF and ADF digestibilities were influenced by the interaction between regrowth and time of year; their average for 60 days of regrowth in January were respectively 54.8 and 48.5%, being the lower values and, in February, the higher values: 64.9 and 60.4%. The ruminal average digestibility was 79.5, 86.2, 99.4 and 96.7% of the total degradable for DM, OM, NDF and ADF, respectively. Effects of regrowth and time of year there were not recorded. Two hours after the morning meal was observed the ammonia ruminal concentration peak. The acetate:propionate: butirate ruminal ratio observed was 74:18:8(%). O consumo e digestibilidades total e parcial da matéria seca (MS), matéria orgânica (MO), proteí- na bruta (PB), fibras em detergente neutro (FDN) e ácido (FDA) e os parâmetros ruminais nitrogênio amoniacal e ácidos graxos de cadeia curta foram avaliados em bovinos de corte alimentados com Brachiaria brizantha cv. marandu aos 30 e 60 dias de rebrota em duas épocas do ano (janeiro e fevereiro). Os consumos de MS, MO e PB foram influenciados pela idade de rebrota da forrageira apresentando maiores valores aos 30 dias e também influenciados pela época do ano, sendo em fevereiro seu maior consumo pelos animais. A digestibilidade da MS foi em média 60,7 e 59,4% aos 30 e 60 dias de rebrota da forrageira, respec- tivamente, porém, demonstrou efeito de interação entre a idade de rebrota e a época do ano, mesmo comportamento observado para MO, com médias de 63,9 e 63% para as respectivas idades de rebrota. A digestibilidade da PB foi maior aos 30 dias de rebrota, média de 70,8%, que aos 60 dias, média de 57%. As digestibilidades da FDN e da FDA com efeito significativo para a interação entre a idade de rebrota e a época do ano, apresentaram aos 60 dias de rebrota na época de janeiro as menores médias, 54,8 e 48,5%, respectivamente e em fevereiro as maiores médias, 64,9 e 60,4%. A digestibilidade ruminal apresentou médias de 79,5, 86,2, 99,4 e 96,7% do total digerível para MS, MO, FDN e FDA, respectivamente, não sendo observados efeitos da idade de rebrota nem da época do ano. Após 2 horas da alimentação foi observado o pico de concentração de nitrogênio amoniacal no rúmen. A média da relação acetato:propionato:butirato observada foi 74:18:8(%).
Author Malheiros, E.B
Queiroz, M.F.S
Berchielli, T. T
Morais, J
Ruggieri, A.C
Messana, J.D
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SubjectTerms Consumo
Diges
Fracionamento do N
Intake
Nitrogen fractionation
Rumen digestibility
Short chain fatty acids
tibilidade ruminal
Ácidos graxos de cadeia curta
Title Digestibilidade e parâmetros ruminais de bovinos consumindo brachiaria brizantha cv. Marandu
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