A comparative study of induction of estrus and ovulation by three different intravaginal devices in ewes during the non-breeding season

The aim of the present study was to compare three methods of estrus synchronization in ewes during the non-breeding season. Forty-two ewes were randomly grouped for three treatments with different intravaginal devices for 12 days: Group A) CIDR, Group B) Self-made P sponge, Group C) MAP (medroxyprog...

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Published in:Journal of Reproduction and Development 2004, Vol.50(1), pp.63-69
Main Authors: Iida, K. (Obihiro Univ. of Agriculture and Veterinary Medicine, Hokkaido (Japan)), Kobayashi, N, Kohno, H, Miyamoto, A, Fukui, Y
Format: Article
Language:English
Subjects:
Animals
Breeding - methods
BREEDING SEASONS
Contraceptive Agents, Female - pharmacology
Contraceptive Devices, Female
Estradiol - blood
Estrus - physiology
Female
Induction of estrus
Intravaginal device
Luteinizing Hormone - blood
Male
Medroxyprogesterone Acetate - pharmacology
Non-breeding season
OESTROUS CYCLE
OVULATION
Ovulation - physiology
Progesterone - blood
Random Allocation
SHEEP
Vaginal Creams, Foams, and Jellies
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Summary:The aim of the present study was to compare three methods of estrus synchronization in ewes during the non-breeding season. Forty-two ewes were randomly grouped for three treatments with different intravaginal devices for 12 days: Group A) CIDR, Group B) Self-made P sponge, Group C) MAP (medroxyprogesterone acetate) cream sponge. Furthermore, all groups were divided into two treatments with (R) or without ram presence to examine the "ram effect". Blood was collected from all treated ewes, and progesterone (P sub4), estradiol 17-v (E sub2) and luteinizing hormone (LH) concentrations were measured by enzyme-immnoassay. All ewes showed estrus behavior between Day O to 3 after device removal, and the mean onset times of their estrus were 23.0, 33.0 and 21.0 h for Groups AR, BR and CR, respectively. On Day 5 as examined by laparoscopy, the ovulation rates (and number of ovulated ewes) were 1.45 (11/11), 1.25 (12/14) and 1.21 (14/14) for Groups A, B and C, respectively. In Group C, the time to LH surge was significantly (P
ISSN:0916-8818
1348-4400
DOI:10.1262/jrd.50.63