ORIGINAL PAPER
The effect of rolled barley, sodium hydroxide-treated wheat or maize cob silage on digestive enzymes activity in the alimentary tract of dairy cows
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1
Shahrekord University, Animal Science Department, Agricultural College, P.O. Box 115, 8818634141 Shahrekord, Iran
2
Aarhus University, Department of Animal Science, AU-Foulum, DK-8830 Tjele, Denmark
Publication date: 2017-11-22
Corresponding author
A. Moharrery
Shahrekord University, Animal Science Department, Agricultural College, P.O. Box 115, 8818634141 Shahrekord, Iran
J. Anim. Feed Sci. 2017;26(4):303-310
KEYWORDS
TOPICS
ABSTRACT
In the present study digestive enzyme activities were studied in
the rumen, intestine and faeces of dairy cows fed rations differing in starch
source. Three total mixed rations were prepared for dairy cows with maize cob
silage (MCS), sodium hydroxide-treated wheat (SHW) or rolled barley as starch
source. The study was arranged as 3 × 3 Latin square design with 3 cows
fistulated in the rumen, duodenum and ileum. The rations consisted of grassclover
silage and maize silage (~60% of dry matter (DM)), rapeseed cake,
soyabean meal, sugar beet pulp and 1 of 3 different starch sources MCS, SHW
or rolled barley (~25% of DM). Samples from different parts of the digestive
tract (rumen, duodenum, ileum) and faeces were collected and enzymatic
activities of α-amylase, protease and lipase as well as their products content in
fresh samples were estimated. When MCS replaced barley or SHW, it resulted
in lower DM (2.61 vs 2.91 and 3.15%) and a higher ash content (30.99 vs
29.24 and 24.31%) in the ruminal fluid without affecting enzyme activities.
Positive correlation between lipolytic and amylolitic activities in ruminal fluid
was stated, which supported the hypothesis that amylolytic bacteria provide
energy for lipolytic bacteria. So, the enzymes activities in the different parts of
the digestive tract were not affected by the different starch sources.
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