The histology of developing porcine adipose tissue

Journal of Animal Science
G J Hausman, R G Kauffman

Abstract

At each of the following days after conception (45, 60, 75, 90 and 105), pig fetuses were removed from sows representing lean and fat stains. From two additional litters, postnatal pigs were sacrificed at 1, 3, 6, 9, 12, 15, 18 and 21 d. Pelikan dye was injected into fetuses and pigs. The whole of the dorsal subcutaneous tissue, including some underlying muscle, was removed. Tissue was fixed into paraffin blocks or was frozen. Paraffin and frozen sections were stained and examined for stromal-vascular and cellular changes during growth. Organized stromal-vascular changes occurred during a period of adipocyte formation from 45 d gestation until 9 d postnatally. At 45 d gestation, the subcutaneous tissue contained many short unorganized connective tissue fibers. Gradually, these fibers became more organized in a ventral to dorsal and caudal to cranial gradient, so that by 1 d postnatally, they formed complete lobules around all existing fat cell clusters. The presumptive adipose space of the complete lobules contained delicate strands of connective tissue and reacted metachromatically for mucin. Connective tissue around lobules became progressively thinner throughout the remaining postnatal ages. Vascularity of the subcutaneous t...Continue Reading

Citations

Mar 17, 2018·Hormone Molecular Biology and Clinical Investigation·Gary J Hausman
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