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472 DEB, G.K. (Animal Production Research The overall estimate was also low. The magnitude
Division, Bangladesh Livestock Research Institute, of REML estimated (co) variance and genetic
Savar, Dhaka); BHUIYAN, A.K.F.H. & parameters obtained in the present study were
HOSSAIN, M.M. (Dept. of Animal Breeding and within the published range of estimates. Therefore,
Genetics, Bangladesh Agricultural University, these estimates may be used in selection and
Mymensingh). Estimation of Genetic Parameters breeding programmes for dairy cattle development
for Economic Traits in Dairy Cattle. Bang. J. in Bangladesh.
Anim. Sci., 2005, 34 (1 & 2), 17-26.
473 HASAN, K.; BOSTAMI, A.B.M.R.
This study was aimed to access information on (Bangladesh Livestock Research Institute, Savar,
genetic parameters i.e. heritability and genetic Dhaka) & KHANDAKER, Z.H. (Dept. of Animal
correlations of some economic traits of dairy cattle Nutrition, Bangladesh Agricultural University,
available in Bangladesh. For that, data materials Mymensingh). Effect of Supplemental Zinc on The
were collected from Central Cattle Breeding Nutrient Utilisation, Growth Performance and Zinc
Station and Dairy Farm, Savar, Dhaka recorded Status of Indigenous Bull Calves. Bang. J. Anim.
during 1972 to 1982 on Indigenous called Local, Sci., 2007, 36 (1 & 2), 33-40.
Friesian × Local (50% F-50%L) and Jersey ×
Local (50% J- 50%L) cattle covered birth weigh The experiment was conducted to investigate the
(BW), first lactation milk yield (FLMY), first effect of supplemental Zn on the nutrient
lactation length (FLL) and first calving interval utilization, growth performance and Zn status of
2
(FCl). REML estimated heritabilities (h ) of BW indigenous growing cattle. Sixteen bull calves of
were 0.365, 0.495 and 0.489 in Local, Friesian × about 14 months age having 77.20±15.30 kg
Local and Jersey × Local cattle, respectively. The average live weight were randomly assigned to
same for FLL, FLMY and FCl were 0.486, 0.428 four dietary treatments viz.: T 0 = control (31.8 mg
and 0.128 in Local; 0.495 and 0.497 in Friesian × Zn/kg); T 1 = control +35 mg Zn/kg; T 2 = control
Local cattle and 0.496, 0.499 and 0.496 in Jersey × +70 mg Zn/kg and T 3 = control +105 mg Zn/kg
Local cattle. The overall estimates were 0.500, diet; each having 4 animals. In a Randomized
0.497, 0.498 and 0.499 respectively for BW, FLL, Block Design. The control diet (T 0) consisted of
FLMY and FCl. The mediums to high estimates 52.10% rice straw, 16.40% german grass, 18.00%
for all the traits indicate that the traits studied were wheat broken, 6.90% rice polish, 6.00% mustard
oil cake and 0.60% common salt. Experimental
largely influenced by additive gene action. Genetic
correlations (r G) of BW with FLL, FLMY and FC: results showed that Zn supplementation had no
were very low except medium r G between BW and significant effect (P>0.05) on feed intake, live
FCl in Local cattle. The direction of genetic weight gain, feed and protein conversion
association was positive except negative r G were efficiency, apparent digestibility of nutrients (DM,
OM, CP, CF, EE and NFE), digestible nutrients
between BW and FLMY and BW and FCl in Local
cattle. First lactation length was positively (DCP, DCF, DEE and DNFE) and TDN values of
genetically correlated with FLMY and FCl in a diets. On the other hand, Zn balance (g/d) and its
medium to high magnitude in all the genetic retention (g/100 g) increased significantly (P<1.01)
groups studied. Genetic correlations between with the increasing level of Zn supplementation.
FLMY and FCl were medium in Jersey × local Results also showed that plasma Zn concentration
increased significantly (P<0.01) whereas, plasma
cattle but low in Local and Friesian × local cattle.
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