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Luteolytic effect of prostaglandin F2α in Boran and Boran × Friesian cross-bred heifers

Published online by Cambridge University Press:  27 March 2009

E. R. Mutiga ,
E. Mukasa-Mugerwa  and
T. Azage
E. R. Mutiga
Affiliation:
Animal Reproduction and Health Section, International Livestock Centre for Africa, PO Box 5689, Addis Ababa, Ethiopia
E. Mukasa-Mugerwa
Affiliation:
Animal Reproduction and Health Section, International Livestock Centre for Africa, PO Box 5689, Addis Ababa, Ethiopia
T. Azage
Affiliation:
Animal Reproduction and Health Section, International Livestock Centre for Africa, PO Box 5689, Addis Ababa, Ethiopia
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Summary

The luteolytic effect of prostaglandin F2α (PGF2α) during the confirmed luteal phase of the oestrous cycle was evaluated in ten Boran and ten Boran × Friesian cross-bred heifers. Following injection with 25 mg Lutalyse, animals were bled every 6 h for 96 h and plasma progesterone (P4) determined by the ELISA technique. Borans had significantly (P < 0·05) smaller corpora lutea (12·01±0·72 ν. 17·03±2·10 mm) and responded faster to PGF2α injection (65·57±1·40 ν. 78·27±2·18 h) than the cross-bred heifers. However, there was no significant difference in either the initial P4 values (6.24±0·98 ν. 8·00±1·71 ng/ml) or the rate of its decline following PGF2α injection between the two breeds. Values declined sharply to basal levels (11% of the initial pretreatment values) within 48 h in both breeds. All ten cross-breds and eight Borans showed standing oestrus within a week of treatment. However, oestrus was better synchronized (P < 0·05) in Borans than cross-breds. It was concluded that PGF2α is effective for oestrus synchronization in both breeds, but oestrus occurred earlier and was more precise in Borans than in cross-breds.

Type
Animals
Information
The Journal of Agricultural Science , Volume 120 , Issue 1 , February 1993 , pp. 103 - 106
Copyright
Copyright © Cambridge University Press 1993

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