EFFECT OF VARIOUS LEVELS OF EXOGENOUS FIBROLYTIC ENZYMES SUPPLEMENTATION IN TOTAL MIXED RATION ON NUTRIENT UTILIZATION AND GROWTH PERFORMANCE IN GIR CALVE
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Date
2019-07
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JAU, JUNAGADH
Abstract
The present study was carried out with the objective of investigating the effect
of exogenous fibrolytic enzymes supplementation on performance of Gir calves.
Total fifteen Gir calves were randomly divided into three groups viz. T1 (Control), T2
and T3. Calves in T1 group were fed on Total Mixed Ration (TMR) without any
supplementation of fibrolytic enzymes and treatment groups were fed on TMR
supplemented with fibrolytic enzyme @ 0.025% and 0.05% in T2 and T3 groups,
respectively for a period of 90 days.
Average dry matter intake (kg/d, kg/100 kg body weight and g/kg W0.75) was
not affected by fibrolytic enzyme supplementation. However, highest dry matter
intake was observed in T2 group followed by T3 and T1 groups. Statistical analysis of
data on average total gain (kg) and average daily gain (g) revealed that T2 and T3
group attained significantly (p<0.05) higher body weight gain and average daily gain
as compared to control but non-significant effect was observed between T2 and T3
group. The highest total gain in body weight and average daily gain of experimental
Gir calves were observed in T2 group. The efficiency of feed utilization (DM intake
per kg gain) was better in T2 and T3 group than control group but treatment difference
between T2 and T3 was non-significant.
Digestibility of dry matter, organic matter and cellulose were significantly
(p<0.05) higher in animals of T2 group than control group but non- significant effect
was observed between T2 and T3 groups and also between T3 and control group.
While, digestibility of crude protein, ether extract and nitrogen free extract were not
affected by fibrolytic enzymes supplementation. Digestibility of crude fiber, neutral
detergent fiber, acid detergent fiber and hemi-cellulose were significantly (p<0.05)
higher in animals of T2 and T3 group than control group but treatment difference
between T2 and T3 was non-significant. There was no effect of supplementation of
fibrolytic enzyme on Digestible Crude Protein (DCP) intake. While average Total
Digestible Nutrient (TDN) intake of experimental Gir calves were increased
significantly (p<0.01) for T2 and T3 groups than control group (T1). Between enzymes
supplemented group T2 had significantly higher TDN intake than T3.
The results for rumen fermentation pattern revealed that strained rumen liquor
pH was significantly decreased in enzyme treated group (T2 and T3) than control
group but treatment difference (T2 and T3) was non-significant. While there was
significant (p<0.01) increase in TVFA concentration and total nitrogen in both enzymes supplemented group (T2 and T3) than control group. Enzyme
supplementation had non-significant effect on average concentration of NH3-N and
non-protein nitrogen (NPN) however, TCA-N was significantly (p<0.05) higher in T2
group than control group but treatment difference T3 and T2.
Fibrolytic enzymes supplementation had no effect on haemato-biochemical
parameters, includes, Hb (%), PCV(%), glucose (mg/dL), total protein (g/dL),
triglycerides (mg/dL) and cholesterol (mg/dL). All haemato-biochemical parameters
were in normal range.
It could be concluded that by supplementing exogenous fibrolytic enzymes
daily to the ration of calves exert positive effects on growth performance, digestibility
of nutrients and extent of ruminal fermentation without affecting haemato biochemicals parameters.