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Biochemical changes in the corpus luteum of intrauterine device fitted goats.


 Parous goats were sham operated (6 goats), bilaterally fitted with IUDs (7 goats), or unilaterally fitted with an IUD isilateral (6 goats) or contralateral (5 goats) to the corpus luteum (CL). Autopsy was on Day 3 or Day 5 of the second or third estrus. The cycle length of IUD-fitted goats was shorter than in controls (6.2 days vs. 16.7 days, p less than .05). Mean CL weight in the contralateral group, 164.8 mg, exceeded mean weight of the ipsilateral group, 92.4 mg (P less than .01). The concentration of total cholesterol was higher in the ipsilateral group than in the contralateral group (3.16 vs. 2.12 mg/gm CL, p less than .01). The protein concentration in CL from the control, unilateral and bilateral groups was 14.4, 12.2, and 23.9 mg, respectively, p less than .05. The content and concentration of progesterone, and total and free cholesterol was higher in sham operated controls than in IUD-fitted goats (not significant). Protein, RNA, and DNA increased considerably in IUD-fitted goats (not significant), indicating a derangement of a luteotrophic rather than luteomorphic mechanism in CL from IUD-fitted goats.
