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| A Comparative Study of Productive and Reproductive Performance and Estimates of Heritability for Economic Traits in Different Genetic Groups of Cattle Available at Baghabarighat Milk Pocket Area of Bangladesh |
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P.K. Das ,
S.Z. Ali ,
A.B.M.M. Islam and B.K. Roy |
Abstract:
The study was conducted
at Baghabarighat milk pocket area to observe the productive and reproductive
performance of the crossbred of Sahiwal x Friesian, Sahiwal x Pabna,
Friesian x Pabna and Pabna x Pabna during the period from 1990 to 1998.
Comprising four genetic groups data of 41 Sahiwal x Friesian, 72 Sahiwal
x Pabna, 55 Friesian x Pabna and 18 Pabna x Pabna were considered to
evaluate birth weight of calves, age at puberty, gestation length, service
per conception, post partum heat period, lactation length, and daily
milk yield. Five Sahiwal and four Friesian sires were used for the crossbreeding.
The exotic sire effect of individuals on their daughters were also evaluated
in this study. Statistical analysis of the results showed that the genetic
group had a significant effect on birth weight (P<0.001), age at
puberty (P<0.001), post partum heat period (P<0.01), lactation
length (P<0.01) and daily milk yield (P<0.001). But genetic group
had no significant effect on gestation length and number of services
per conception. The performance of SL x F cows with regard to birth
weight of calves (26.35±0.35 kg), age at puberty (25.21±0.55 months),
lactation length (260.38±4.48 days) and daily milk yield (10.56±0.14
litres), was found to be better among the other genetic groups. The
best performance for the trait service per conception (1.29±0.13) and
post partum heat period (104.82±6.53 days) was observed in Pabna x Pabna
cows. F x Pabna grades had a slightly shorter gestation length (280.59±0.91
days) than the other genetic groups. So it can be concluded that SL
x F crossbred are well ahead to other genetic groups in respect of productive
aspect, whereas F x Pabna crosses show the remarkable performance both
for production and reproduction. Under this consideration the F x Pabna
grades ranked first in over all merit followed by SL x F, SL x Pabna
and then Pabna x Pabna cows. Individual sire effect was found significant
on birth weight (P<0.05) and average daily milk yield (P<0.05)
in SL x F genetic group, on birth weight (P<0.05), age at puberty
(P<0.05) and lactation length (P<0.05) in SL x Pabna genetic group
and on lactation length (P<0.05) and average daily milk yield (P<0.05)
in F x Pabna genetic group. The pooled estimates of heritability for
birth weight, age at puberty, gestation length, service per conception,
post partum heat period, lactation length and daily milk yield were
0.44±0.30, 0.14±0.17, 0.25±0.21, 0.03±0.12, 0.33±0.26, 0.46±0.33 and
0.43±0.27 respectively. In this study the h2 estimates of
reproductive traits were found lower than that of productive traits
which indicate that these traits are mostly influenced by managemental
factors rather than genetic variability.
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How to cite this article:
P.K. Das , S.Z. Ali , A.B.M.M. Islam and B.K. Roy , 2003. A Comparative Study of Productive and Reproductive Performance and Estimates of Heritability for Economic Traits in Different Genetic Groups of Cattle Available at Baghabarighat Milk Pocket Area of Bangladesh. Journal of Biological Sciences, 3: 726-740.
DOI: 10.3923/jbs.2003.726.740
URL: https://scialert.net/abstract/?doi=jbs.2003.726.740
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