Impacts of whey protein on starch digestion in rumen and small intestine of steers
Four Korean native steers (511 ± 17.2 kg; 2 × 2 replicated crossover design) fitted with duodenal cannulas were used to investigate the influence of oral administration of soluble whey protein (WP; 82.29% crude protein) on ruminal fermentat...
Main Authors: | , , , , |
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Format: | Article |
Language: | English |
Published: |
Korean Society of Animal Sciences and Technology
2019-03-01
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Series: | Journal of Animal Science and Technology |
Subjects: | |
Online Access: | http://www.ejast.org/archive/view_article?pid=jast-61-2-98 |
Summary: | Four Korean native steers (511 ± 17.2 kg; 2 × 2 replicated
crossover design) fitted with duodenal cannulas were used to investigate the
influence of oral administration of soluble whey protein (WP; 82.29%
crude protein) on ruminal fermentation, gastrointestinal (GI) hormone secretion
in the blood, pancreatic α-amylase activity in the duodenum, and
disappearance rate in each segment of the GI tract. Steers were orally fed the
basal diet (control; TMR [total mixed ration] 9 kg/d) or the basal diet with
enriched WP (400 g/d) for 14 days. The apparent crude protein disappearance rate
in the rumen of the WP was higher than in control (p <
0.05). However, no difference between groups was observed in the apparent crude
protein disappearance rate in the intestine and the apparent starch
disappearance rates in the rumen, GI tract. The level of cholecystokinin,
secretin, and ghrelin in serum and pancreatic α-amylase activity in the
duodenum of the WP also did not change. The changes in the level of blood urea
nitrogen related to protein metabolism were higher in the WP than in the control
(p < 0.05). However, the levels of total protein,
lipid, carbohydrate and mineral metabolites did not change. Consequently, we
suggest that the oral administration of WP in steers assisted in ruminal
fermentation due to the population increase of microbes in the rumen but did not
improve the starch digestion rate in the small intestine because GI hormone
secretion in the blood and pancreatic α-amylase activity did not
change. |
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ISSN: | 1598-9429 2055-0391 |