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Descripción
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| 1. A study was set up to investigate the influence of wheat cultivar and wheat crop nitrogen (N) fertilisation on starch (ST) digestion rate in broiler chickens. A total of 288 broiler chickens were used in a 3_2 factorial design with diets based on three varieties of wheat (Apache, Caphorn and Charger), each grown at two N application rates (40 and 170 kg of N/ha). 2. Starch digestion rate was determined by measuring the remaining starch and the mean retention time (MRT) in 4 segments of the small intestine (proximal and distal jejunum and proximal and distal ileum) and in excreta, using chromic oxide as a marker. 3. Varietal differences in starch content (714¿746 g starch/kg DM) were smaller than differences caused by crop N fertilisation (705¿755 g starch/kg DM). Nitrogen application increased wheat crude protein (CP) content from 94 to 130 g/kg DM. 4. The majority of the ST in all diets was digested by the time the digesta reached the distal ileum (average 0_84 in the distal jejunum and 0_96 in the proximal ileum). 5. Starch digestion differed among wheat cultivars in the proximal jejunum (from 0_43 to 0_57, P<0_001). Afterwards no differences due to wheat cultivar or N fertilisation were found. 6. Starch digestion rate varied among wheat cultivars (from 2_45 to 3_28 h_1, P<0_001), but did not vary with N fertilisation, whereas dietary CP digestion rate was not affected by wheat cultivar or N fertilisation level. The digestion rate of ST was faster than that of CP (average 2_78 vs. 1_53 h_1). 7. The current study suggests that wheat cultivars can be classified on their rate of ST digestion independently of the N fertilisation applied to the crop during growth. | |
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Internacional
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JCR del ISI
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Título de la revista
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BRITISH POULTRY SCIENCE |
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ISSN
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0007-1668 |
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Factor de impacto JCR
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1,134 |
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Información de impacto
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Volumen
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50 |
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DOI
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Número de revista
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0 |
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Desde la página
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341 |
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Hasta la página
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349 |
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Mes
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ENERO |
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