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Estrone Concentration in Sow Milk During and After Parturition^1,2,

The Pennsylvania State University⁵, University Park 16802

Abstract

Colostrum and milk samples were obtained from five Yorkshire gilts through manual expression of glands at the onset of parturition; at 1, 2, 4 and 8 h after birth of the first piglet and at 8-h intervals thereafter until 96 h. Oxytocin (30 units) was used to stimulate milk ejection for all samples except during parturition. Samples were frozen until subjected to a validated radioimmunoassay for estrone (E1). In a preliminary study no differences existed in concentrations of E1 among various glands. Therefore, mean of values obtained from three randomly selected glands was used for analysis in the main trial. Concentration of E1 at birth averaged 13.6 ± 1.78 ng/ml ( ± SE), and decreased to 6.05 ± .80, 3.12 ± .60, 1.42 ± .30, .69 ± .20 and .33 ± .92 ng/ml at 4, 8, 16, 32 and 96 h, respectively. The postpartum decrease in the concentration of E1 in the milk is most likely due to the loss of the placental source.

¹ Paper no. 7487 in the Journal Series of the Pennsylvania Agr. Exp. Sta. Portions of this material were presented at the Amer. Soc. Anim. Sci. 78th Annu. Meet., Manhattan, KS.

² The authors express appreciation to Dr. H. D. Guthrie, Beltsville Agr. Res. Center, Beltsville, MD for supplying the WII BARC No. 4. antiserum. The assistance of S. Gilbertson and S. Sladden for milk sampling, and of D. Fetterolf and R. Grabill for animal care, as well as statistical help from R. Vasilatos-Younken, is gratefully acknowledged.

³ Under educational leave from the Canadian Government, Dept. of Agr., Agr. Res. Sta., Lennox-ville, Quebec. Present address: Research Station, Agriculture Canada, Lennoxville, C. P. 90, Quebec J1M 1Z3.

⁴ To whom reprint requests should be addressed.

⁵ Dept. of Dairy and Anim. Sci. Received September 8, 1986.