Eurasian Journal of Veterinary Sciences - 1999; 15(1)
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Eurasian Journal of Veterinary Sciences - RSS feed of 1999; 15(1)1300-0705January 1999Eurasian Journal of Veterinary Sciences1300-0705
http://www.eurasianjvetsci.org/text.php3?id=424
1 ). Ten
individuals (5 male and 5 female) from each breed were used as material in the
study. The chromosome preparations oblained from sheep were painted with
NOR-banding method. Thirty metaphase spreads were examined in the chromosome
preparation ol each sheep and the average active NOR numbers were determined.
The general average active NOR numbers of female and male AKK, GBM and F
1 cross were estimated 6.10, 6.33 and 6.03; and 6.03, 6.69 and 6.63
respectively. The variation between male and female of AKK, GBM and F1 cross
were found not significant. The general breed averages active NOR numbers of
AKK. GBM and F 1 cross were calculated as 6.06, 6.51 and 6.33
respectively. There were no! significant variation between GBM, AKK and F
1 cross. The study; there were a variation individuals of AKK and GBM and
F 1 crossbreed connected with average active NOR numbers. It is
concluded that more studies should be done to investigate the relationship
between average active NOR chromosom numbers and yields for improvement of
animal production in livestock.]]>1999-01-01Eurasian Journal of Veterinary Sciences1150131999-01-01005Original Article
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combination, and PGF2α and PGF2α regimens
for synchronization of estrus in cows. The study was carried out on 20 (6
Brangus, 14 Brown Swiss) cows, age ranging 3 - 5 years old. The cows were
randomly devided into two groups. In group I (n=10), cows were treated with an
intramuscular injection of 20 µg GnRH (day=0) a random stage of the estrous
cycle, followed by PGF2α 7µg days later (day=7). in group II (n=10),
cows were given two injections of PGF2α 11 day apart (day= 0, and
11). The cows were observed to determine the onset of the estrus for four days
and then inseminated 12 hours after the onset of estrous. Blood samples were
collected to determine plasma progesterone levels, in group I on the day ol GnRH
and PGF2α injections and at estrus. and in group II on the day of
each injection of PGF2α and at estrus. The mean interval from
synchronization to onset of estrus, synchronization and pregnancy rates of the
groups were determined. Plasma progesterone ievets on days 0 and estrous were
similar (p > 0,05) between the two groups, but on the day of synchronization,
in group İ were found to be higher progesterone levels than in group 11 (p <
0.01). The mean interval from synchronization to estrus in group I and II were
found 54,3 ± 3.2 and 62.2 ± 3.2 hours, respectively (p> 0.05). The
synchronization rate were higher in group I (% 100) than in group II (% 80)
(p< 0.01), and pregnancy rate of the group I and II were % 60 and % 40
respectively (p< 0.05), The distribution of the estrous in group I
concentrated between 40 and 60 hours following the synchronization, but in group
II were a homogen distribution between 40 and 80 hours after the
synchronization. As a conclusion, application of a GnRH analogue prior to
synchronization of estrus with an injection of PGF2α may provide
higher results than two injections of PGF2α lor estrus
synchronization in cows.]]>1999-01-01Eurasian Journal of Veterinary Sciences1151281999-01-01121Original Article
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