title: Macroscopic and histological characteristics of fluid-filled ovarian structures in dairy cows.
abstract: The primary objective of this study was to use macroscopic and histological features of corpora lutea with a cavity and anovulatory cystic ovarian structures, present in 90 pairs of abattoir-derived dairy cow ovaries, as the basis to clarify the nomenclature of ovarian structures. Excluding morphologically normal ovarian fol-licles (antrum < 2 cm, wall < 1 mm), there were 27 fluid-filled ovarian structures. Ovulatory structures > 16 mm in diameter were designated as Group A (cavity ≤ 10 mm and wall > 10 mm) or Group B (cavity > 10 mm and wall < 10 mm). The volume of luteal tissue was less (P < 0.05) in Group B than in Group A, whereas that of a solid corpus luteum (CL) was intermediate (least square means ± SEM: 72 ± 1.92, 11.22 ± 1.57 and 5.84 ± 1.92 cm3, respectively). There was a greater proportion (P < 0.05) of small luteal cells in Group B compared to a solid CL, whereas Group A was intermediate (58.6 ± 5.3, 37.4 ± 5.3 and 44.0 ± 4.4%, respectively). Connective tissue was thicker (P < 0.05) in Group B than in Group A (295.4 ± 46.9 vs. 153.9 ± 38.2 μm). Based on the above-mentioned characteristics and differences, Groups A and B were designated as a CL with a cavity and a cystic CL, respectively. Furthermore, there were three groups of anovulatory ovarian structures. Structures in Group C were termed persistent/anovulatory follicles (overall diameter and wall thickness ≤ 20 and 1-3 mm, respectively). Finally, Groups D and E were designated as a follicle-fibrous cyst and a follicle-luteinised cyst (based on histological structure) for anovulatory structures with an overall diameter and wall thickness of ≥ 20 and ≤ 3 mm, and ≥ 20 and ≥ 3 mm, respectively.
authors: Research Institute for Animal Breeding and Nutrition Gesztenyés u. 1 Herceghalom H-2053 Hungary.
authors: Orsolya Gabriella
authors: OG
authors: Balogh
authors: Szent István University Department of Anatomy and Histology Budapest Hungary.
authors: Ernő
authors: E
authors: Túry
authors: Szent István University Department of Biomathematics and Informatics, Faculty of Veterinary Science Budapest Hungary.
authors: Zsolt
authors: Z
authors: Abonyi-Tóth
authors: Szent István University Department of Biomathematics and Informatics, Faculty of Veterinary Science Budapest Hungary.
authors: John
authors: J
authors: Kastelic
authors: Research Institute for Animal Breeding and Nutrition Gesztenyés u. 1 Herceghalom H-2053 Hungary.
authors: György
authors: G
authors: Gábor
keywords: Corpus luteum; cystic ovaries; dairy cattle; ovarian cyst; ovary