K. Heinonen et al., ESTROUS SYNCHRONIZATION IN ETHIOPIAN HIGHLAND ZEBU CATTLE BY MEANS OFINTRAVAGINAL CLOPROSTENOLE ADMINISTRATION, Tropical Animal Health and Production, 28(1), 1996, pp. 121-125
Two series were used in studying the use of a low dose of intravaginal
cloprostenole in oestrous synchronisation of zebu cows. In series I,
39 cows were given 175 mcg of cloprostenole with a plastic catheter in
the anterior vagina twice, with a 12-day interval. After treatment, 6
1.5% of these cows came into heat, were inseminated and 70 days later
pregnancies were confirmed in 66.6% of inseminated cows. In series II,
intravaginal treatment (40 cows) was compared with intramuscular admi
nistration (33 cows) of 500 mcg of cloprostenole. After treatment the
cows were checked for silent heat in addition to visible heat. The ove
rall oestrous response, for both visible and silent heat, was 62.6% an
d 60.6% after the intravaginal and the intramuscular treatments respec
tively, and there was no statistical difference between the 2 treatmen
ts. Unfortunately the pregnancy of the cows could not be checked. Intr
avaginal administration of 175 mcg of cloprostenole resulted in good o
estrous synchronisation and pregnancy rate. For zebu cattle, the oestr
ous synchronisation response was similar to that reached with 500 mcg
of cloprostenole administered intramuscularly.