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by
S.A. Azmal |
Total Records (
2 ) for
S.A. Azmal |
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S.A. Azmal
,
M.R. Amin
,
P.C. Goswami
,
M.P. Mostari
,
M.S. Islam
and
R. Khatun
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The experiment was conducted to compare the relative efficiency of homo and heterospermic
insemination in respect of fertility judged by conception and calving rate. Spermatozoa
from three different breeds of bull namely Holstein Friesian (HF), Red Chittagong
(RC) and Sahiwal (SL) were mixed in equal number and preserved for 3 days and
inseminated at different days. In this study 168 cows were inseminated and 42
of them were inseminated with heterospermic semen containing equal numbers of
spermatozoa from a HF, a RC and a SL bull. After calving the paternity of calves
was established by comparing coat colour and conformation. Difference between
homo and heterospermic insemination on conception and calving rate was not significant
(p>0.05). The heterospermic conception and calving rates were 80.95 ±0.07 and
64.29 ± 0.08%, with the homospermic rates being 66.67 ±0.04 and 50.79
±0.04%, respectively. The conception and calving rate from heterospermic insemination
was found insignificantly (p>0.05) different from that of homospermic insemination
separately at first, second and third day of preservation. Conception rates of
homo and heterospermic insemination at first day were 76.19 ±0.07 and 85.71
±0.12%, respectively. The corresponding values at third day were 59.52 ±0.07
and 78.57 ±13%. Calving rate of homo and heterospermic insemination at first
day were 57.14±0.08 and 64.29 ±0.13%, respectively. The corresponding values
at third day were 45.24 ±0.08 and 64.29 ±0.13%. The numbers of offspring (12:8:7)
sired by the three bulls (HF: RC:SL) after using heterospermic semen did not differ
significantly from an assumed 1:1:1 ratio (χ2 = 1.55: p>0.05). The
sex ratios among calves from heterospermic insemination (15♂ .12♀) also did
not differ significantly (χ2 = 0.34: p>0.05) from 1:1. From the above
results, it was concluded that heterospermic insemination did not however, show
any significant superiority in conception and calving rate in cows compared to
homospermic insemination. However, heterospermic insemination offers no apparent
risk to co-operating farmers, since overall conception and calving rate were either
numerically higher or at least equal to that obtainable from homospermic insemination. |
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S.A. Azmal
,
M.R. Amin
,
H. Khatun
,
M.S. Islam
,
M.P. Mostari
and
P.C. Goswami
|
| |
The experiment was conducted to compare the relative efficiency of homo and heterospermic
bull semen in terms of preservation quality. Spermatozoa from three different
breeds of bull namely Holstein Friesian (HF), Red Chittagong (RC) and Sahiwal
(SL) were mixed in equal number and preserved for 3 days. The quality of semen
in terms of mass motility, normal and live sperm content of homo and heterospermic
semen were studied at various preservation periods. In total 312 samples were
included in the analysis. The average (%) mass motility, normal and live sperm
of homospermic semen were 51.77 ± 0.49, 77.55 ± 0.45 and 78.73 ±
0.44 respectively and for heterospermic semen the corresponding values were 59.94
± 0.85, 83.55 ± 0.78 and 83.69±0.76. The significantly (p<0.001)
highest mass motility, normal and live sperm percentages were observed in heterospermic
semen as compared to homospermic semen. The quality of semen between homo and
heterospermic semen in terms of mass motility, normal and live sperm percentage
did not differ significantly (p>0.05) between groups at first day but differed
significantly (p<0.001) at second and third day of preservation. Mass motility
of homo and heterospermic semen at first day were 60.77±0.55 and 62.31±0.95%,
respectively. The corresponding values at third day were 44.04 ± 0.44 and
57.12 ± 0.77%. Normal sperm of homo and heterospermic semen at first day
were 86.50 ± 0.43 and 86.31 ± 0.74%, respectively. The corresponding
values at third day were 70.36 ± 0.38 and 81.00 ± 0.66%. Live sperm
of homo and heterospermic semen at first day were 86.56 ± 0.43 and 86.54
± 0.75%, respectively. The corresponding values at third day were 71.54
± 0.46 and 81.42 ± 0.79%. From the above results, it was concluded
that heterospermic semen could be better preserved in terms of mass motility,
normal and live sperm percentage compared to homospermic ones. |
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