Cystic ovaries in intermittently-suckled sows: follicle growth and endocrine profiles
R. Gerritsen A B , B. F. A. Laurenssen A , W. Hazeleger A , P. Langendijk A C , B. Kemp A and N. M. Soede A D
+ Author Affiliations
- Author Affiliations
A Adaptation Physiology Group, Department of Animal Sciences, Wageningen University, PO Box 338, 6700 AH Wageningen, The Netherlands.
B Present address: Agrifirm Innovation Center, PO Box 20018, 7302 HA Apeldoorn, The Netherlands.
C Present address: South Australian Research and Development Institute, JS Davies Building, Roseworthy Campus, Roseworthy, SA 5371, Australia.
D Corresponding author. Email: nicoline.soede@wur.nl
Reproduction, Fertility and Development 26(3) 462-468 https://doi.org/10.1071/RD12382
Submitted: 28 November 2012 Accepted: 3 March 2013 Published: 2 April 2013
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.
Additional keywords: cortisol, luteinizing hormone, oestradiol, oestrus, progesterone.
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