Growth of Skeleton of the Fœtal Sheep

Benzie, D.

doi:10.1016/s0007-1935(17)52773-6

Cited by 10 publications

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“…Diagnosis of pregnancy in sheep by examination of cervical mucus has been successfully carried out by Hashimoto (1961) at 40-50 days of gestation. Diagnosis of foetal number has been made by Benzie (1950Benzie ( , 1951 at 55 days and by Kralj (1952 a, b) at 59 days of gestation by means of X-ray examination. Since this paper was originally written, Ford, Clark & Gallup (1963) have described their technique and results of the radiological examination of Clun Forest ewes.…”

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confidence: 99%

X-ray diagnosis of pregnancy in sheep with special reference to the determination of the number of foetuses

Ardran

Brown

1964

J. Agric. Sci.

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1. Sixty-four Dorset Horn ewes and sixty Half- Bred ewes were X-rayed in the pelvic region at stages of pregnancy between 51 and 110 days.2. Diagnosis of pregnancy and estimates of the number of foetuses carried were made from the X-ray film.3. Over the range of gestation stages examined, interpretation of the number of foetuses present was found to be most accurate at stages between 91 and 110 days.4. An accurate estimation of whether the ewe is pregnant or barren can be made from 50 days onwards.

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confidence: 99%

X-ray diagnosis of pregnancy in sheep with special reference to the determination of the number of foetuses

Ardran

Brown

1964

J. Agric. Sci.

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“…Our findings show that the pattern of development of these bones in pigs agrees with Lindsey's observations of cattle. The relative position of the sheep when examined in these terms appears to be similar to that of cattle (Benzie, 1950;Wenham (unpublished observations)).…”

Section: Discussionmentioning

confidence: 59%

A radiographic study of skeletal growth and development in the pig. Temporal pattern of growth

Wenham¹,

Fowler²,

McDonald³

1973

J. Agric. Sci.

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The skeletons of 34 pigs killed at a number of weights from birth to 120 kg were examined radiographically. Data were also used from radiographs of 83 foetuses of different ages.Estimates were made of the age of appearance of various ossification centres and measurements taken of the diaphyseal length and breadth. A chart is given showing the age of appearance of ossification centres. Exponential equations in which the independent variate was time were fitted to both pre-and post-natal linear measurements. These equations were used to calculate the age at which each of the measurements attained a given proportion of the post-natal asymptote. The development of the pig's skeleton is discussed in relation to that of other species. Attention is drawn to the possibility that the uncritical use of accepted terminology such as early and late maturing may tend to obscure an understanding of the manner in which certain components of the skeleton develop.

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“…Although the development of the sheep foetal skeleton was described by Harris (1937), Benzie (1950), Smith (1956, Lascelles (1958), Rajtova (1972Rajtova ( , 1973, more recently by Neiss (1982) and Cerny (1987) with a large number of detailed information,there is still enough room for a detailed description of ossification in individual developmental periods iIJ. view of the step-like character of this process, and histotopographical.…”

Section: Sheep Prenatal Ontogeny Ossification Of Phalangesmentioning

confidence: 99%

Topographical Picture of Digit Ossification in the Sheep in the Late Embryonic and Early Foetal Period of Development

Černý¹

1990

Acta Vet. Brno

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Cerny H.: Topographical Picture of Digit Ossification in the Sheep in the Late Embryonic and Early Foetal Period of DefJelopment. Acta vet. Bmo, 59,1990: 91-99.Using a model of acropodium skeleton of three embryos (CRL 18-35 mm) and 26 foetuses (eRL 41-210 mm) of Merino sheep we studied the development of the skeleton of digits during the late embryoniC and early foetal period of ontogeny using light microscopy.The material was processed by standard methods for the study of histological . . sections. These were stained with hematoxylin-eosin, van Gieson and alcian blue, together with a mixture of Ponceau 2 R -acid fuchsine.From the histotopographical point of view we described the structural picture . of the developing acropodium skeleton in relation with the foetal age aild morphological determination of individual·phases of ossification. We confirmed the sequence of ossification of digits III and IV. The distal phalanx is the first to ossify, followed by the proximal and then middle phalanges.Ossification takes place at the age of 47 to 70 days of prenatal development. It begins on the 47th day with desmogenous ossification of the tip of the distal phalanx, progressing proximally and joining the endochondral ossification of the cartilaginous skeleton of the cartilaginous skeleton of the corpus.. The onset of ossification of the cartilaginous skeleton of diaphyses of the proxinial and middle phalanges takes place on axial facets and progresses abaxially ..From the 80th day we can notice marked proliferation of blood vessels to the skeleton of epiphyses and distal capitula of the proximal and middle phalanges. The spreading blood capillaries cause disintegration of cartilage, form numerous canals holding osteogenous mesenchyma besides the vessels. Capitula of both phalanges ossify from the diaphysis. Sheep, prenatal ontogeny, ossification of phalangesThe cartilaginous embryonic skeleton, which subsequently ossifies to form a definitive skeleton, comes into being in the transformation of the prechondralinto chondral blastema. The complexity of the process of osteogeny is conditioned by the differentiation and growth of the structure in the course of ontogenetic development.Available literary references show that sheep skeleton was a frequent subject of investigation in the past. A number of authors contributed to general knowledge of the cartilaginous skeleton, its development and growth fJ:om the point of.view of its morphology or function in relation to its prenatal as well as postnatal ontogeny.. Although the development of the sheep foetal skeleton was described by Harris (1937), Benzie (1950), Smith (1956, Lascelles (1958), Rajtova (1972Rajtova ( , 1973, more recently by Neiss (1982) and Cerny (1987) with a large number of detailed information,there is still enough room for a detailed description of ossification in individual developmental periods iIJ. view of the step-like character of this process, and histotopographical. identification.., . We 'therefore decided to use the model of sheep acropodi...

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Growth of Skeleton of the Fœtal Sheep

Cited by 10 publications

References 0 publications

X-ray diagnosis of pregnancy in sheep with special reference to the determination of the number of foetuses

X-ray diagnosis of pregnancy in sheep with special reference to the determination of the number of foetuses

A radiographic study of skeletal growth and development in the pig. Temporal pattern of growth

Topographical Picture of Digit Ossification in the Sheep in the Late Embryonic and Early Foetal Period of Development

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