Development of the omasum in sheep

Lubis, D.; O'Shea, James

doi:10.1159/000144924

Cited by 9 publications

(9 citation statements)

References 8 publications

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“…The appearance of the primary smaller laminae in the omasum of red deer (67 days, 25% of gestation) was later than that described for the omasum of sheep, where it was placed at around 30–35 days, or 20–22% of gestation (Del Rio Ortega, 1973; Lubis & O'Shea, 1978).…”

Section: Discussionmentioning

confidence: 83%

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Morphometric and immunohistochemical study of the omasum of red deer during prenatal development

Redondo¹,

Franco

Masot³

2005

Journal of Anatomy

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The red deer is an important study species because of its value in the national economy and because it provides a wealth of genetic material. To date, there has been little research into the prenatal development of the stomach of ruminants, and none of the red deer. We therefore performed a histological evaluation of the ontogenesis of the omasum in the red deer. Histomorphometric and immunohistochemical analyses were carried out on 50 embryos and fetuses of deer from the initial stages of prenatal life until birth. For test purposes, the animals were divided into five experimental groups: Group I (1.4 -3.6 cm crown-rump length, CRL; 30 -60 days, 1-25% of gestation); Group II (4.5 -7.2 cm CRL; 67-90 days, 25 -35% of gestation); Group III (8-19 cm CRL; 97-135 days, 35-50% of gestation);Group IV (21 -33 cm CRL; 142 -191 days, 50 -70% of gestation); and Group V (36 -40 cm CRL; 205-235 days, 75 -100% of gestation). At 67 embryonic days, the omasum wall was differentiated, and comprised three layers: the epithelial layer, pluripotential blastemic tissue and serosa. The stratification of the epithelial layer was accompanied by changes in its structure, with the appearance of four laminae of different sizes; in order of appearance these were: primary at 67 days, secondary at 90 days, tertiary at 97 days and quaternary at 135 days. At around mid-gestation, lateral evaginations were formed from the stratum basale of the primary and secondary smaller laminae. These were the primitive corneum papillae. From 205 days, the corneum papillae were present in all four sizes of laminae.The histodifferentiation of the lamina propia-submucosa, tunica muscularis and serosa showed patterns of development similar to those reported for the rumen and reticulum of red deer. The omasum of red deer during prenatal life, especially from 67 days of gestation, was shown to be an active structure with full secretory capacity. Its histological development, its secretory capacity (detected by the presence of neutral mucopolysaccharides) and its neuroendocrine nature (detected by the presence of positive non-neuronal enolase cells and the neuropeptides vasoactive intestinal peptide and neuropeptide Y) were parallel to the development of the rumen and the reticulum. However, its prenatal development was later than that of the omasum in sheep, goat and cow.

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Section: Discussionmentioning

confidence: 83%

“…However, Ramkrishna & Tiwari (1979) specified that its thickness in goat remained unchanging throughout prenatal development in the omasum. Even Lubis & O'Shea (1978), in a study of sheep, reported a reduction in perinatal stages.…”

Section: Discussionmentioning

confidence: 94%

Morphometric and immunohistochemical study of the omasum of red deer during prenatal development

Redondo¹,

Franco

Masot³

2005

Journal of Anatomy

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“…The omasum is lined by keratinized stratified squamous epithelium and possesses the same four cell layers as the rumen: stratum basalae, stratum spinosum, stratum granulosum, and stratum corneum (Wardrop, 1961a;Lubis and O'Shea, 1978). There is a thick layer of muscularis mucosae beneath the laminae propria followed by a thin layer of connective tissue and serosa.…”

Section: Chapter II Literature Reviewmentioning

confidence: 99%

Ontogenesis of peptide transport and morphological changes in the ovine gastrointestinal tract

Poole

Wong

McElroy

et al. 2003

Small Ruminant Research

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Nutrient absorption is important in all stages of life. As the diet of an animal changes from birth on, morphological and biochemical adaptation can be anticipated in order to accommodate changing demands. The main focus of the present study was to examine the relationship between age and diet on the potential for peptide transport via PepT1 in the gastrointestinal tract of lambs and to relate changes of peptide transport capability to morphological changes. A 2x4 factorial arrangement of treatments was used with 32 crossbred lambs. Four blocks were created based upon gender, birth type (single or twin), birth weight, and birth date. Lambs were randomly allotted at birth to receive or not to receive a creep diet. All lambs were allowed to nurse. Sampling times of 2, 4, 6, or 8 wk were randomly allotted to lambs. Samples for RNA extraction and histological evaluation were taken from the dorsal rumen, ventral rumen, omasum, duodenum, jejunum, and ileum. Villi were about 7% shorter (P < 0.09) in lambs receiving creep feed. Papillary height and width increased linearly (P < 0.001 and P < 0.0001, respectively) with age. Total and keratinized epithelial cells in the stomach decreased (P < 0.03 and P < 0.004, respectively) with age and were fewer (P < 0.0002 and P < 0.0001, respectively) in lambs receiving creep feed. Creep feeding appears to have slightly altered the mucosal structure of the small intestine and it was advantageous in that it iii stimulated papillary growth and thus predisposed the rumen for the introduction of feed into the diet. A 2.8 kb oPepT1 mRNA was present in all tissues studied by 2 wk, and age did not significantly influence the abundance of oPepT1 mRNA in the small intestine or stomach. In the small intestine, abundance of oPepT1 mRNA was greatest (P < 0.0007) in the jejunum. In the stomach, abundance of oPepT1 mRNA was greatest (P < 0.01) in the dorsal rumen. In the stomach, particularly in the rumen, a greater abundance of oPepT1 mRNA was observed in lambs not receiving the creep diet. It seems likely that a stimulus for development is coming from the non-luminal direction, possibly bloodborne, and may be involved in the ontogenesis of oPepT1. Peptide transport appears to be a physiologically important process in the young lamb and the rumen appears to be involved in the transport of peptides, particularly in nursing lambs.

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“…The histology of omasum resembles that of the ruminoreticulum (Wardrop 1961;Lubis and O'Shea 1978). The distinguishing feature is the presence of lamina muscularis mucosa in the omasal leaves.…”

Section: Introductionmentioning

confidence: 97%

Studies on the development of omasum in west african dwarf goats (Capra hircus)

Nwaogu

Ezeasor

2008

Vet Res Commun

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This work studied the sequential morphological changes of omasum in foetuses, neonates and adult West African Dwarf (WAD) goats by gross and light microscopic methods. The mean omasal volume was 1.37 +/- 0.36, 4.2 +/- 0.4, 8.7 +/- 6.9 and 60.1 +/- 8.6 ml for gestation day 87 and 146 foetuses, neonates and adults respectively. Grossly the mucosa exhibited longitudinally oriented primary, secondary, tertiary and quartnery laminae with smooth surface in foetuses and numerous papillae in the adults. Microscopically it was lined by stratified squamous epithelium which was divided into larger lighter luminal and smaller darker basal zones in gestation day 60 foetuses. The core of the laminae contained extension of the inner muscular tunic. The basal zone developed lateral evaginations (corial papillae) into the lighter zone of the laminae in gestation day 106 foetuses. By term these corial papillae approached the luminal surface. The papillae emerged above the luminal surface in 4 week old neonates. The papillae were fully developed in adult goats. The mean papillary height and width were -205.1 +/- 34.0, 67.0 +/- 9.6; 235.0 +/- 86.5, 185.0 +/- 42.3 and 570.3 +/- 60.0, 290.1 +/- 66.3 microm for foetuses, neonates and adult goats. The inner circular layer was thicker than the outer longitudinal layer of the muscular tunic. The central muscular layer of the laminae originated from the inner circular layer with attachment to the outer muscular layer in adults. This attachment could be adaptation for better anchorage and muscular contraction of the laminae in WAD goats.

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Development of the omasum in sheep

Cited by 9 publications

References 8 publications

Morphometric and immunohistochemical study of the omasum of red deer during prenatal development

Morphometric and immunohistochemical study of the omasum of red deer during prenatal development

Ontogenesis of peptide transport and morphological changes in the ovine gastrointestinal tract

Studies on the development of omasum in west african dwarf goats (Capra hircus)

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