Endocrine changes associated with cystic ovarian degeneration in sows

Glen W. Almond From the Department of Food Animal and Equine Medicine, College of Veterinary Medicine, North Carolina State University, 4700 Hillsborough St, Raleigh, NC 27606.

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 DVM, PhD
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R. Gregg Richards From the Department of Food Animal and Equine Medicine, College of Veterinary Medicine, North Carolina State University, 4700 Hillsborough St, Raleigh, NC 27606.

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Summary

Endocrine changes in sows with ovarian cysts were determined to be comparable with those in sows in diestrus. Blood samples were collected at frequent intervals from 5 sows affected with cystic ovaries. Concentrations of serum luteinizing hormone, progesterone, estradiol-17β, and cortisol were determined by use of established radioimmunoassays. The development of ovarian cysts has been proposed to be associated with a deficiency of luteinizing hormone rather than an intrinsic ovarian abnormality. In contrast, the results of this study demonstrated that tonic and pulsatile luteinizing hormone release were not affected adversely in sows with cystic ovaries.

Summary

Endocrine changes in sows with ovarian cysts were determined to be comparable with those in sows in diestrus. Blood samples were collected at frequent intervals from 5 sows affected with cystic ovaries. Concentrations of serum luteinizing hormone, progesterone, estradiol-17β, and cortisol were determined by use of established radioimmunoassays. The development of ovarian cysts has been proposed to be associated with a deficiency of luteinizing hormone rather than an intrinsic ovarian abnormality. In contrast, the results of this study demonstrated that tonic and pulsatile luteinizing hormone release were not affected adversely in sows with cystic ovaries.

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