Cinética de passagem da digesta, balanço hídrico e de nitrogênio em eqüinos consumindo dietas com diferentes proporções de volumoso e concentrado

Este trabalho foi conduzido com os objetivos de avaliar a cinética de passagem da digesta no trato digestivo e estimar o balanço hídrico e de nitrogênio em eqüinos consumindo dietas com diferentes níveis de volumoso. Foram utilizados quatro potros não castrados, mestiços, com idade de 18 meses, aloj...

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Published in:Revista brasileira de zootecnia Vol. 32; no. 1; pp. 140 - 149
Main Authors: Oliveira, Chiara Albano de Araújo(UFRRJ Zootecnia), Almeida, Fernando Queiroz de(UFRRJ), Vieira, Antônio Assis(UFRRJ), Lana, Ângela Maria Quintão(UFRRJ), Macedo, Robert(UFRRJ Ciências do Solo), Lopes, Bruna Adese(UFRRJ CNPq PIBIC), Corassa, Anderson(FAPERJ)
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Portuguese
Published: Sociedade Brasileira de Zootecnia 01-02-2003
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Abstract Este trabalho foi conduzido com os objetivos de avaliar a cinética de passagem da digesta no trato digestivo e estimar o balanço hídrico e de nitrogênio em eqüinos consumindo dietas com diferentes níveis de volumoso. Foram utilizados quatro potros não castrados, mestiços, com idade de 18 meses, alojados em baias individuais e exercitados uma vez ao dia. O delineamento experimental utilizado foi o quadrado latino 4 x 4, em que cada período experimental teve duração de 14 dias de adaptação à dieta e cinco dias de coleta fecal. As dietas foram compostas por feno de capim-coastcross e concentrado, fornecidos simultaneamente, duas vezes ao dia, nas proporções de 40:60, 60:40, 80:20 e 100:0. A cinética de passagem da digesta foi estimada pelo tempo médio de retenção da digesta (TMR), da taxa de passagem (TxP) e do tempo de trânsito (TT), utilizando dois indicadores externos, o cromo fixado como mordente na fibra em detergente neutro (Cr-FDN) e o complexo cobalto-EDTA (Co-EDTA). O balanço hídrico foi avaliado de acordo com as quantidades de água ingerida in natura e na dieta e excretada na urina e nas fezes. O balanço de nitrogênio foi avaliado de acordo com as quantidades diárias de compostos nitrogenados consumidos e excretados. As médias dos valores da cinética de passagem nas fases sólida e líquida da digesta foram 42,7 e 33,8 horas para TMR e de 2,4 e 3,1 %/hora para TxP. O TT da fase líquida da digesta apresentou efeito linear negativo, em função da inclusão de volumoso na dieta. O consumo médio de água foi de 13,8 litros. O balanço hídrico variou de 7,9 a 1,8 litros para as dietas com 40 e 100% de volumoso, respectivamente, reduzindo de forma linear, com a inclusão do volumoso na dieta. This work aims to evaluate the passage of digesta kinetics through the digestive tract and estimate the water and nitrogen balance in horses fed different levels of roughage in diets. Four crossbred yearling were used with age of 18 months, housed in individual stalls and exercised once a day. The present experiment was performed according to a 4 X 4 Latin Square design which each experimental period had 14 days for adaptation to diet and five days for fecal collection. Diets were composed by coastcross bermudagrass hay and concentrate, fed simultaneously and supplied twice a day, in proportions of 40:60, 60:40, 80:20 and 100:0. Kinetics of digesta passage was evaluated through the medium retention time (MRT), rate of passage (RP) and transit time (TT), using two external markers, mordant chromium in neutral detergent fiber (Cr-NDF) and Cobalt-EDTA (Co-EDTA). Water balance was evaluate according to water intake in natura and in diets and water excreted in urine and feces. Nitrogen balance was evaluated with daily intake and excreted nitrogen compounds. The MRT and RP of solid and liquid phases of digesta were 42.7 and 33.8 hours and 2.4 and 3.1 %/hours, respectively. Transit time had a negative linear effect in function of roughage inclusion in diets. Daily average water intake was 13.8 liters and water balance was 7.9 liters in diet with 40% of roughage and 1.8 liters in diet with 100% of roughage, showing a linear reduction with roughage inclusion in diets.
AbstractList Este trabalho foi conduzido com os objetivos de avaliar a cinética de passagem da digesta no trato digestivo e estimar o balanço hídrico e de nitrogênio em eqüinos consumindo dietas com diferentes níveis de volumoso. Foram utilizados quatro potros não castrados, mestiços, com idade de 18 meses, alojados em baias individuais e exercitados uma vez ao dia. O delineamento experimental utilizado foi o quadrado latino 4 x 4, em que cada período experimental teve duração de 14 dias de adaptação à dieta e cinco dias de coleta fecal. As dietas foram compostas por feno de capim-coastcross e concentrado, fornecidos simultaneamente, duas vezes ao dia, nas proporções de 40:60, 60:40, 80:20 e 100:0. A cinética de passagem da digesta foi estimada pelo tempo médio de retenção da digesta (TMR), da taxa de passagem (TxP) e do tempo de trânsito (TT), utilizando dois indicadores externos, o cromo fixado como mordente na fibra em detergente neutro (Cr-FDN) e o complexo cobalto-EDTA (Co-EDTA). O balanço hídrico foi avaliado de acordo com as quantidades de água ingerida in natura e na dieta e excretada na urina e nas fezes. O balanço de nitrogênio foi avaliado de acordo com as quantidades diárias de compostos nitrogenados consumidos e excretados. As médias dos valores da cinética de passagem nas fases sólida e líquida da digesta foram 42,7 e 33,8 horas para TMR e de 2,4 e 3,1 %/hora para TxP. O TT da fase líquida da digesta apresentou efeito linear negativo, em função da inclusão de volumoso na dieta. O consumo médio de água foi de 13,8 litros. O balanço hídrico variou de 7,9 a 1,8 litros para as dietas com 40 e 100% de volumoso, respectivamente, reduzindo de forma linear, com a inclusão do volumoso na dieta.
Este trabalho foi conduzido com os objetivos de avaliar a cinética de passagem da digesta no trato digestivo e estimar o balanço hídrico e de nitrogênio em eqüinos consumindo dietas com diferentes níveis de volumoso. Foram utilizados quatro potros não castrados, mestiços, com idade de 18 meses, alojados em baias individuais e exercitados uma vez ao dia. O delineamento experimental utilizado foi o quadrado latino 4 x 4, em que cada período experimental teve duração de 14 dias de adaptação à dieta e cinco dias de coleta fecal. As dietas foram compostas por feno de capim-coastcross e concentrado, fornecidos simultaneamente, duas vezes ao dia, nas proporções de 40:60, 60:40, 80:20 e 100:0. A cinética de passagem da digesta foi estimada pelo tempo médio de retenção da digesta (TMR), da taxa de passagem (TxP) e do tempo de trânsito (TT), utilizando dois indicadores externos, o cromo fixado como mordente na fibra em detergente neutro (Cr-FDN) e o complexo cobalto-EDTA (Co-EDTA). O balanço hídrico foi avaliado de acordo com as quantidades de água ingerida in natura e na dieta e excretada na urina e nas fezes. O balanço de nitrogênio foi avaliado de acordo com as quantidades diárias de compostos nitrogenados consumidos e excretados. As médias dos valores da cinética de passagem nas fases sólida e líquida da digesta foram 42,7 e 33,8 horas para TMR e de 2,4 e 3,1 %/hora para TxP. O TT da fase líquida da digesta apresentou efeito linear negativo, em função da inclusão de volumoso na dieta. O consumo médio de água foi de 13,8 litros. O balanço hídrico variou de 7,9 a 1,8 litros para as dietas com 40 e 100% de volumoso, respectivamente, reduzindo de forma linear, com a inclusão do volumoso na dieta. This work aims to evaluate the passage of digesta kinetics through the digestive tract and estimate the water and nitrogen balance in horses fed different levels of roughage in diets. Four crossbred yearling were used with age of 18 months, housed in individual stalls and exercised once a day. The present experiment was performed according to a 4 X 4 Latin Square design which each experimental period had 14 days for adaptation to diet and five days for fecal collection. Diets were composed by coastcross bermudagrass hay and concentrate, fed simultaneously and supplied twice a day, in proportions of 40:60, 60:40, 80:20 and 100:0. Kinetics of digesta passage was evaluated through the medium retention time (MRT), rate of passage (RP) and transit time (TT), using two external markers, mordant chromium in neutral detergent fiber (Cr-NDF) and Cobalt-EDTA (Co-EDTA). Water balance was evaluate according to water intake in natura and in diets and water excreted in urine and feces. Nitrogen balance was evaluated with daily intake and excreted nitrogen compounds. The MRT and RP of solid and liquid phases of digesta were 42.7 and 33.8 hours and 2.4 and 3.1 %/hours, respectively. Transit time had a negative linear effect in function of roughage inclusion in diets. Daily average water intake was 13.8 liters and water balance was 7.9 liters in diet with 40% of roughage and 1.8 liters in diet with 100% of roughage, showing a linear reduction with roughage inclusion in diets.
Author Lopes, Bruna Adese(UFRRJ CNPq PIBIC)
Macedo, Robert(UFRRJ Ciências do Solo)
Almeida, Fernando Queiroz de(UFRRJ)
Vieira, Antônio Assis(UFRRJ)
Lana, Ângela Maria Quintão(UFRRJ)
Oliveira, Chiara Albano de Araújo(UFRRJ Zootecnia)
Corassa, Anderson(FAPERJ)
AuthorAffiliation FAPERJ
Universidade Federal Rural do Rio de Janeiro
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DocumentTitleAlternate Kinetics of passage of digesta and water and nitrogen balance in horses fed diets with different ratios of roughage and concentrate
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Issue 1
Keywords horse
eqüinos
balanço hídrico
rate of passage
nitrogen
water balance
nitrogênio
taxa de passagem
Language English
Portuguese
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Snippet Este trabalho foi conduzido com os objetivos de avaliar a cinética de passagem da digesta no trato digestivo e estimar o balanço hídrico e de nitrogênio em...
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SubjectTerms AGRICULTURE, DAIRY & ANIMAL SCIENCE
balanço hídrico
eqüinos
horse
nitrogen
nitrogênio
rate of passage
taxa de passagem
VETERINARY SCIENCES
water balance
Title Cinética de passagem da digesta, balanço hídrico e de nitrogênio em eqüinos consumindo dietas com diferentes proporções de volumoso e concentrado
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Volume 32
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