Dog Development: Difference between revisions

Revision as of 08:52, 21 April 2010

Introduction

Dog breeds

The domestic dog (Canis lupus familiaris) has been derived from an ancestoral wolf and now consists of a breed family of more than 300 worldwide, with extensive variations in morphology (size, shape and weight). The average canine gestation period from ovulation to birth (parturition) approximately 64 days. There have been identified about 400 congenital disorders relating to dog development.

--Mark Hill 08:28, 21 April 2010 (EST) Content under development (notice removed when complete)

Historic Embryology
1897 Pig \| 1900 Chicken \| 1901 Lungfish \| 1904 Sand Lizard \| 1905 Rabbit \| 1906 Deer \| 1907 Tarsiers \| 1908 Human \| 1909 Northern Lapwing \| 1909 South American and African Lungfish \| 1910 Salamander \| 1951 Frog \| Embryology History \| Historic Disclaimer

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Taxon

Dog genetics

NCBI Taxonomy Browser Canis lupus familiaris (Genbank common name: dog)

Synonyms: Canis familiaris, Canis domesticus, Canis canis

Chromosomes: 40 (38, X, Y)

Genetic code: Translation table 1 (Standard)

Mitochondrial genetic code: Translation table 2 (Vertebrate Mitochondrial)

Lineage( full ):cellular organisms; Eukaryota; Fungi/Metazoa group; Metazoa; Eumetazoa; Bilateria; Coelomata; Deuterostomia; Chordata; Craniata; Vertebrata; Gnathostomata; Teleostomi; Euteleostomi; Sarcopterygii; Tetrapoda; Amniota; Mammalia; Theria; Eutheria; Laurasiatheria; Carnivora; Caniformia; Canidae; Canis; Canis lupus

Development Overview

Days shown below relate to days after ovulation (day 0).

2 to 5 days - fertilization

14 to 16 days - embryo attaches to uterus

22 to 23 days - heartbeat visible

62 to 64 days - parturition (birth or whelping)

Sexual differentiation begins early in the embryonic period prenatally and continues into early postnatal life.

Caudal vena cava development- five theories to origin (right-sided supracardinal, caudal cardinal, sacrocardinal, lateral sympathetic or subcardinal veins).

Placenta

Classified as endotheliochorial placentation forming a zonary placenta, which is a complete girdle in dogs. Three zones: girdle zone (endotheliochorial labyrinth), hemochorial hemophagous zone (marginal hematoma) and polar zone (epitheliochorial free)

Trophoblast cell invasion continues after chorioallantois villous penetration and the materno–fetal interface is described as lamellar, with fetal projections interdigitating with maternal septa.

(Data from: Miglino MA, etal., 2006 and other sources)

Estrous Cycle

Estrus, also called "in heat" is the time of sexually receptivity and occurs every 17 to 21 days.

Ovulation occurs 5 to 6 days prior to the first day of diestrus and is indicated by plasma progesterone concentrations higher than 2 ng/mL. Parturition (birth or whelping) occurs between 62 to 64 days after ovulation.

Links: Estrous Cycle)

Abnormalities

Cardiac Defects
Hip dysplasia
Congenital renal disease

Other

Canine Eclampsia - (puerperal tetany, hypocalcemia) develops mainly in small-breed dogs with large litters.
Brucellosis - male and female can be carriers of this sexually transmitted disease.

References

Reviews

Articles

Search Pubmed

Search Pubmed Now: dog development | canine development | Estrous Cycle |

Historic Embryology
1897 Pig \| 1900 Chicken \| 1901 Lungfish \| 1904 Sand Lizard \| 1905 Rabbit \| 1906 Deer \| 1907 Tarsiers \| 1908 Human \| 1909 Northern Lapwing \| 1909 South American and African Lungfish \| 1910 Salamander \| 1951 Frog \| Embryology History \| Historic Disclaimer

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Cite this page: Hill, M.A. (2024, May 22) Embryology Dog Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Dog_Development

What Links Here?

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 ==Introduction==
 [[File:Dog breeds 01.jpg|thumb|Dog breeds]]
-The domestic dog (Canis lupus familiaris) has been derived from an ancestoral wolf and now consists of a breed family of more than 300 worldwide, with extensive variations in morphology (size, shape and weight). The average canine gestation period from ovulation to birth (parturition) approximately 64 days.
+The domestic dog (Canis lupus familiaris) has been derived from an ancestoral wolf and now consists of a breed family of more than 300 worldwide, with extensive variations in morphology (size, shape and weight). The average canine gestation period from ovulation to birth (parturition) approximately 64 days. There have been identified about 400 congenital disorders relating to dog development.
-There have been identified about 400 congenital disorders relating to dog development.
 --[[User:S8600021|Mark Hill]] 08:28, 21 April 2010 (EST) Content under development (notice removed when complete)