Theme 22: Grazing Management
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Publication Date
2001
Location
Brazil
Description
This study was performed with grazing sheep, to establish: a) if the amount of total faecal N (C; in g 100g-1 of organic matter intake (OMI)) remains constant at three feeding levels, in four utilisation periods of deferred Panicum coloratum cv. Verde; b) the relationship between C and faecal N fractions, and c) the relationship between faecal daily excretion of OM and N, and OMI. Intake increased (P< 0.01) with utilisation period, and was related (r = - 0.82; P< 0.01) to the protein content of food, the insoluble N fraction (r = -0.49; P< 0.01) and the soluble:insoluble N ratio (r = 0.41; P< 0.01) in faeces. No relation with total N concentration (r = -0.22; P> 0.05) or soluble N fraction (r = -0.02; P> 0.05) in faeces could be found. Daily excretion of OM and N were positively related (R2 = 0.93 and 0.96, respectively; P< 0.01) to OMI. The slopes of regression lines, but not the intercepts, were different (P< 0.01) between evaluation periods. The digestibility can be estimated from OMI and faecal N whenever time of the year is taken into consideration.
Citation
Ferri, C. M.; Stritzler, N. P.; and Brizuela, M. A., "Estimation of Organic Matter Digestibility and Intake from Faecal Organic Matter and Daily N Excretion and Concentration" (2001). IGC Proceedings (1985-2023). 7.
(URL: https://uknowledge.uky.edu/igc/19/22/7)
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Estimation of Organic Matter Digestibility and Intake from Faecal Organic Matter and Daily N Excretion and Concentration
Brazil
This study was performed with grazing sheep, to establish: a) if the amount of total faecal N (C; in g 100g-1 of organic matter intake (OMI)) remains constant at three feeding levels, in four utilisation periods of deferred Panicum coloratum cv. Verde; b) the relationship between C and faecal N fractions, and c) the relationship between faecal daily excretion of OM and N, and OMI. Intake increased (P< 0.01) with utilisation period, and was related (r = - 0.82; P< 0.01) to the protein content of food, the insoluble N fraction (r = -0.49; P< 0.01) and the soluble:insoluble N ratio (r = 0.41; P< 0.01) in faeces. No relation with total N concentration (r = -0.22; P> 0.05) or soluble N fraction (r = -0.02; P> 0.05) in faeces could be found. Daily excretion of OM and N were positively related (R2 = 0.93 and 0.96, respectively; P< 0.01) to OMI. The slopes of regression lines, but not the intercepts, were different (P< 0.01) between evaluation periods. The digestibility can be estimated from OMI and faecal N whenever time of the year is taken into consideration.
