EVALUATION OF DIETS CONTAINING DELIGNIFIED PADDY STRAW ON GROWTH PERFORMANCE OF BUFFALO BULL CALVES
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Date
2024-01
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SRI VENKATESWARA VETERINARY UNIVERSITY, TIRUPATI - 517 502. (A.P.) INDIA
Abstract
In a completely randomized design (CRD), 24 Murrah buffalo
bull calves were randomly allotted to three dietary treatments (T1 to T3)
comprising of green fodder viz., Hybrid Napier, concentrate mixture and
paddy straw viz. normal paddy straw-NPS (T1; control), delignified
paddy straw (DPS)-50% (T2) and delignified paddy straw -100% (T3),
respectively. A concentrate mixture of 20% CP was prepared by using
feed ingredients like maize, DORB, soybean meal. Weighed quantities
of paddy straw and concentrate mixture were mixed every day and
offered to calves in TMR form. All the three diets were evaluated for
their effect on growth, nutrient utilisation, carcass characteristics and
cost economics in growing buffalo bull calves.
The percent DM, OM, CP, EE, CF, NFE, TA, NDF, ADF, hemi
cellulose, cellulose and ADL were 94, 86.54, 5.57, 2.77, 33.55, 44.65,
13.46, 72.2, 49.34, 22.80, 38.1 and 5.43; 92.73, 91.41, 3.38, 2.97, 55.08,
29.98, 8.59, 81.32, 56.04, 25.28, 29.36 and 4.12 per cent in normal
paddy straw and DPS, respectively. The calcium and phosphorous
content in normal paddy straw and DPS were 0.42 and 0.105; 0.46 and
0.07 per cent, respectively.
Feeding delignified paddy straw to growing buffalo bull calves
had no effect (P>0.05) on DM, CP, EE and ADF digestibility as
compared to control. However, digestibility of OM, CF, NFE, NDF,
cellulose and hemicellulose were significantly higher (P<0.01) in T3
group as compared to the control group. The dry matter intake (kg/day)
was significantly higher (P<0.01) in T2 group followed by T3 and T1.
Inclusion of delignified paddy straw in the diet had no effect (P>0.05)
on DMI expressed as % BW and
g/kg W 0.75 among the different
dietary treatments. Higher (P<0.05) water intake (L/day) in T2 and
water intake (L/kg DMI) in T3 was observed in the calved fed
delignified straw as compared to control. Further, better dung score
(2.50) was recorded in T2 compared T1 (3.45) and T3 (1.50).
The present study indicated that feeding of delignified paddy straw in
buffalo bull calves had no effect on the body weight gain (kg), ADG
(g/d) , feed efficiency and cost of feed/kg gain among the different
dietary groups. However, there is a numerical increase in body weight
gain (kg), ADG (g/d), better feed efficiency and decreased cost of
feed/kg gain in T2 group compared to the T1 and T3 group. The cost of
feed /kg gain decreased by ₹ 24.00 and 12.81 in T2 and T3, respectively,
as compared to T1. Feeding of delignified paddy straw had no effect
(P>0.05) on DCP content expressed as % in diet consumed and intake
(kg). However, the TDN content expressed as % in diet consumed was
higher in T3 group compared to T1 and T2.
The carcass studies in buffalo bull calves fed delignified paddy
straw at different levels had no effect (P>0.05) on the slaughter weights,
wholesale cuts expressed as percent of carcass weight, yield of visceral
organs expressed as percent of pre-slaughter weight.
Thus, it was concluded that replacement of normal paddy straw
with delignified paddy straw at a rate of 50% found to be superior with
increased body weight gain, nutrient utilisation and decreased cost of
feeding compared to 100% replacement in buffalo bull calves.