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

Autor:	E. Mukasa-Mugerwa, E. R. Mutiga, T. Azage
Rok vydání:	1993
Předmět:	Estrous cycle Basal (phylogenetics) chemistry.chemical_compound Animal science chemistry Significant difference Genetics Prostaglandin Animal Science and Zoology Plasma progesterone Luteal phase Biology Agronomy and Crop Science
Zdroj:	The Journal of Agricultural Science. 120:103-106
ISSN:	1469-5146 0021-8596
DOI:	10.1017/s0021859600073652
Popis:	SUMMARYThe 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.
Databáze:	OpenAIRE
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