Abstract
Adult East Freisan crossbred (n = 220) and Chios ewes (n = 105) were divided into four groups and inseminated with chilled semen, which had been stored for 7, 13, 20 or 26 h at 5°C. Unilateral intrauterine insemination (50 x 106 spermatozoa in 0.25 ml) was performed with the aid of a laparoscope. Inseminations were carried out 48 - 52 h after pessary removal (30 mg FGA) without detecting estrus. The lambing rates after intrauterine insemination with chilled semen were found to be similar in East Fresian crossbred (40%) and Chios ewes (30%). Intrauterine insemination with chilled semen stored up to 26 h resulted in similar lambing rates; whereas, fertility of Chios ewes tended to decline with increased holding time of chilled semen. From this study, it is concluded that decreasing the storage time of chilled semen at 5°C improves pregnancy in Chios ewes and that East Fresian crossbred ewe's conception rates to intrauterine insemination with chilled semen was relatively higher than Chios ewes.
Original language | English |
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Pages (from-to) | 5812-5814 |
Number of pages | 3 |
Journal | African Journal of Biotechnology |
Volume | 10 |
Issue number | 30 |
Publication status | Published - Jun 27 2011 |
Externally published | Yes |
Keywords
- Chilled semen
- Dairy sheep
- Lambing rate
- Time of insemination
ASJC Scopus subject areas
- Biotechnology
- Applied Microbiology and Biotechnology
- Molecular Biology
- Genetics
- Agronomy and Crop Science