Journal article
Effects of progesterone intravaginal devices on synchronization of estrus in postpartum dairy cows
Journal of Dairy Science, Vol.70(10), pp.2162-2167
1987
Abstract
Effects of two intravaginal treatments of progesterone on the synchronization of behavioral estrus were compared in three groups of lactating dairy cows at 7 to 8 wk postpartum. Group 1 had progesterone-releasing intravaginal devices with attached estradiol benzoate capsules inserted for 12 d. Groups 2 and 3 had controlled internal drug release devices, containing progesterone alone, inserted for 9 or 12 d. Behavioral estrus was detected as early as 24, 32, and 36 h after removal of the devices in groups 1, 2, and 3, respectively. Estrus was better synchronized and the proportion of cows showing estrus after device removal was greater in group 1 than in groups 2 and 3. After removal of devices, mean milk progesterone of all cows that did not show estrus was higher than that of cows that showed estrus. In groups 1, 2, and 3, 1 of 7, 7 of 12, and 4 of 12 cows not showing estrus had high milk progesterone after removal of the devices, indicating the presence of functional corpora lutea. In cows not displaying estrus milk progesterone concentrations decreased, indicating these cows were cyclic, although behavioral estrus was absent.
Details
- Title
- Effects of progesterone intravaginal devices on synchronization of estrus in postpartum dairy cows
- Authors/Creators
- S. Tjondronegoro (Author/Creator) - Murdoch UniversityP. Williamson (Author/Creator) - Murdoch UniversityG.J. Sawyer (Author/Creator) - Department of Agriculture, Bunbury, Western Australia 6230S. Atkinson (Author/Creator) - Commonwealth Scientific and Industrial Research Organisation
- Publication Details
- Journal of Dairy Science, Vol.70(10), pp.2162-2167
- Publisher
- American Dairy Science Association
- Identifiers
- 991005543675607891
- Murdoch Affiliation
- School of Veterinary Studies
- Language
- English
- Resource Type
- Journal article
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Source: InCites
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InCites Highlights
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- Collaboration types
- Domestic collaboration
- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.51 Dairy & Animal Sciences
- 3.51.115 Livestock Reproduction
- Web Of Science research areas
- Agriculture, Dairy & Animal Science
- Food Science & Technology
- ESI research areas
- Agricultural Sciences