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Tissue Composition of Lactating Guinea Pia Mammary Glands¹

Department of Physical Biology, New York State University Veterinary College, Cornell University, Ithaca 14850

ABSTRACT

Fourteen mammary glands from eight English shorthair guinea pigs were used to determine the fractional contributions (f) to total tissue by secretory epithelial tissue (E) and supportive tissue (S). The blood plasma (B) component was determined with an additional eight animals with ¹²⁵I-human serum albumin as the label for plasma volume. Means and standard deviations were f_E = .557 ± .023, f_S = .398 ± .023 and f^B = .045 ± .010. Therefore, lactating guinea pig mammary glands (excluding milk) were 55.7% secretory epithelial tissue, 39.8% supportive tisue, and 4.5% blood plasma.

¹ This work was supported in part by the U.S. Atomic Energy Commission under Contract AT-(30–1)-4039. The advice offered by Dr. P. H. Craig and the technical assistance of Mr. H. O. Wilkin and Mr. M. D. Dougherty were appreciated.

² Present address: Lovelace Foundation for Medical Education and Research, Fission Product Inhalation Laboratories, Building 9200, Area Y, Kirtland AFB East Albuquerque, New Mexico 87115.