Abstract:
The effect of nutrition and hormonal treatment on ovarian
stimulation was investigated in the first experiment. In this experiment 6
kenana heifers were used, they were fed steaming up ration for 3 months
after that all heifers were inserted with 2 sponges impregnated with
progesterone. They were left for 7 days, on days 6 all the heifers were
injected with prostaglandin PGF2a(500mg). The sponges were removed
on day 7, and at the same day they were injected with GnRH(0.2mg ). A
bull was introduced 72 hours after GnRH treatment for natural
insemination.
The results showed that the response to nutritional and hormonal
treatment were 33.3%, and these responded heifer showed estrus 24
hours at the end of hormonal treatment, 33.3% of heifers showed mating
behaviours without a clear estrus signs, while 33.3% of heifers did not
responded.
In experiment two 12 crossbreed cows were used and divided
randomly to two groups. In group (A) 5 cows were treated with single
injection of prostaglandin PGf2a(500mg)after 72 hours they were
artificially inseminated (A.I).
In group (B) 7 cows were treated with 2 injection of PGf2a
(500mg), 11 days apart and artificially inseminated 72 hours, after the
second injection.
The results of this experiment showed that three cows (60%) of
ix
cows in group A showed estrus sings 24 hours after treatment, while two
cows (40%) did not show estrus behaviour.
Pregnancy test after 60 days performed by rectal palpation, showed
that 60% for cows gave positive results while 40% gave negative result
in group (A).
In group B five of seven cows (71.4%) showed estrus behaviour 24
hours after the first injection of PGF2a, all cows (100%) in group B
were observed in estrus after the second injection of PGF2a.
Results of rectal palpation showed that all cows (100%) were
pregnant 60 days after insemination.
