Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 438219
Title Cystic ovaries in intermittently-suckled sows: follicle growth and endocrine profiles
Author(s) Gerritsen, R.; Laurenssen, B.F.A.; Hazeleger, W.; Langendijk, P.; Kemp, B.; Soede, N.M.
Source Reproduction Fertility and Development 26 (2014). - ISSN 1031-3613 - p. 462 - 468.
DOI https://doi.org/10.1071/RD12382
Department(s) Adaptation Physiology
WIAS
Publication type Refereed Article in a scientific journal
Publication year 2014
Keyword(s) luteinizing-hormone - reproductive-performance - estrous behavior - dairy-cattle - lactation - estrus - pigs - estradiol - ovulation - cortisol
Abstract This paper presents follicle development and hormone profiles for sows with normal ovulation or cystic follicles during an intermittent-suckling (IS) regime that started at Day 14 of lactation. Sows were subjected to separation from their piglets during blocks of 6 h or 12 h. In total, 8 out of 52 sows developed cystic follicles; either full cystic ovaries (n = 6) or partial ovulation (n = 2). Increase in follicle size of these sows was similar to that of normal ovulating sows until pre-ovulatory size at Day 5 after the start of separation, but from then on became larger (P <0.05). LH surge was smaller or absent in sows that developed (partially) cystic ovaries (0.4 ± 0.1 vs 3.6 ± 0.3 ng mL–1; P <0.01). Peak levels of oestradiol (E2) were similar but high E2 levels persisted in sows that developed (partly) cystic ovaries and duration of oestrus tended to be longer. The risk of developing (partly) cystic ovaries was higher when IS occurred in blocks of 6 h versus 12 h (33 vs 10%). In conclusion, the appearance of cystic ovaries at approximately Day 20 of ongoing lactation was related to an insufficient LH surge, as is also the case in non-lactating sows.
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