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Feeding of grainless diets containing different nitrogen sources to crossbred growing bulls: effects on rumen fermentation pattern, microbial enzyme activity and ciliate protozoa population

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Title Feeding of grainless diets containing different nitrogen sources to crossbred growing bulls: effects on rumen fermentation pattern, microbial enzyme activity and ciliate protozoa population
Not Available
 
Creator S.S. Giri
Seema Jaggi
N.N. Pathak
 
Subject Crossbred bull
Wheat bran
Urea
Mustard oil cake
Rumen fermentation
Ciliate protozoa
Rumen microbial enzyme
 
Description Not Available
The effect of feeding grainless concentrates containing different supplemental nitrogen sources
along with wheat straw-based diets was studied on rumen fermentation pattern, microbial enzyme
activity and protozoa population. For the purpose five fistulated 18 months aged crossbred bulls (Bos
indicus×Bos taurus) were used in a 5×5 Latin square design. The animal fed the control diet,
received barley 300 g/kg dry matter (DM) in the concentrate mixture (CM1) as a source of grain,
whereas other concentrates contained only wheat bran (CM2) or wheat bran supplemented with 25 g
urea (CM3), 215 g groundnut cake (GNC) (CM4) or 270 g mustard oil cake (MOC) (CM5)/kg DM,
as a source of supplemental nitrogen. The bulls were fed concentrate mixtures at 1 kg/100 kg of their
body weight. Each feeding period lasted 21 days followed by rumen liquor collection. Neither the
presence of barley nor the nitrogen from different sources in the concentrate mixture did influence
the daily dry matter intake (DMI) by the bulls. The DMI per unit of body weight was similar in
all the groups. Feeding of barley-based concentrate (CM1) and GNC supplemented grainless diet
(CM4) significantly decreased the rumen pH at 4–6 h post-feeding. The total volatile fatty acid (VFA)
concentration was the highest (P < 0.01) in animals fed CM1 and higher (P < 0.05) on CM4 than on CM5. However, the dietary treatments did not influence the molar proportion of acetate, propionate
and butyrate. Supplementation of urea in the concentrate mixture (CM3) resulted in the highest
(P < 0.01) ruminal ammonia-N (NH3-N) concentration. The ruminal total-nitrogen concentration was
the highest (P < 0.01) in animals fed on CM1 and higher (P < 0.05) on CM4 than on CM5. In the
strained rumen liquor (SRL) -amylase activity was increased significantly when the animals fed
CM1. The endoglucanase activity was significantly decreased (P < 0.05) in animals fed on CM4
and CM5 as compared to that of CM1 fed bulls. Supplementation of oil cakes or urea to the wheat
bran-based grainless concentrates significantly increased the protease activity. Urease activity was
significantly increased in response to the dietary urea. Total ciliate population did not differ in SRL of
animals fed on CM1, CM2 and CM4, which were significantly higher to that of those fed on CM3 or
CM5. Addition of MOC seemed to depress the overall rumen fermentation. The rumen fermentation
pattern of bulls fed wheat bran-based grainless concentrate mixture with supplemental nitrogen, urea
or oil cakes, was almost similar to that of those fed on grain-based concentrate at 1 kg/100 kg of body
weight, when wheat straw used as basal roughage.
Not Available
 
Date 2018-11-12T07:04:28Z
2018-11-12T07:04:28Z
2004-11-15
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/10349
 
Language English
 
Relation Not Available;
 
Publisher Not Available