Histomorphometric analysis of the rumen of sheep during development

A. Franco From the Departments of Anatomy and Embryology (Franco, Regodón, Robina) and Histology and Pathology (Redondo), Facultad de Veterinaria, Universidad de Extremadura, 10071 Cáceres, Spain.

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S. Regodón From the Departments of Anatomy and Embryology (Franco, Regodón, Robina) and Histology and Pathology (Redondo), Facultad de Veterinaria, Universidad de Extremadura, 10071 Cáceres, Spain.

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A. Robina From the Departments of Anatomy and Embryology (Franco, Regodón, Robina) and Histology and Pathology (Redondo), Facultad de Veterinaria, Universidad de Extremadura, 10071 Cáceres, Spain.

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E. Redondo From the Departments of Anatomy and Embryology (Franco, Regodón, Robina) and Histology and Pathology (Redondo), Facultad de Veterinaria, Universidad de Extremadura, 10071 Cáceres, Spain.

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Summary

Histomorphometric and scanning electron microscopic analyses were carried out on 74 embryos and fetuses and 20 sheep (early postnatal to adult age). Histodifferentiation of the rumen took place at 33 days of fetal life. Ruminal pillars were observed at 42 days, and at 61 days, ruminal papillae appeared as evaginations of the epithelial stratum basale. Neutral mucopolysaccharides first appeared in epithelial cells at 46 days of fetal life; thereafter, numbers decreased gradually and subsequently stabilized in postnatal life. Acid mucopolysaccharides, mucins, and mucoid compounds were not detected. Age and diet were recognized as factors that determine the structure of the ruminal mucosa. Growth curves and formulas were set out for each tissue layer.

Summary

Histomorphometric and scanning electron microscopic analyses were carried out on 74 embryos and fetuses and 20 sheep (early postnatal to adult age). Histodifferentiation of the rumen took place at 33 days of fetal life. Ruminal pillars were observed at 42 days, and at 61 days, ruminal papillae appeared as evaginations of the epithelial stratum basale. Neutral mucopolysaccharides first appeared in epithelial cells at 46 days of fetal life; thereafter, numbers decreased gradually and subsequently stabilized in postnatal life. Acid mucopolysaccharides, mucins, and mucoid compounds were not detected. Age and diet were recognized as factors that determine the structure of the ruminal mucosa. Growth curves and formulas were set out for each tissue layer.

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