Bovine Development

Embryology - 18 Apr 2024        Expand to Translate
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Introduction

Cow and calf

Bovine (taxon- Bos taurus) development is studied extensively due to the commercial applications of cattle both for milk and meat production.

Cattle Gestation Periods	(Bovine Development)
Breed	Average Days (±7–10 days)
Angus	281
Ayrshire	279
Brahman	292
Brown Swiss	290
Charolais	289
Guernsey	283
Hereford	285
Holstein	279
Jersey	279
Limousin	289
Shorthorn	282
Simmental	289

Bovine Links: Bovine Development | Category:Bovine

Historic Embryology   1922 Pharyngeal Arches | 1946 Oocyte to Blastocyst

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Some Recent Findings

Blastocyst to Early Gastrulation Stages

Bovine stem cell marker expression

Cattle Embryos from Hatched Blastocyst to Early Gastrulation Stages "A detailed morphological staging system for cattle embryos at stages following blastocyst hatching and preceding gastrulation is presented here together with spatiotemporal mapping of gene expression for BMP4, BRACHYURY, CERBERUS1 (CER1), CRIPTO, EOMESODERMIN, FURIN and NODAL. Five stages are defined based on distinct developmental events." Expression of pluripotency master regulators during two key developmental transitions: EGA and early lineage specification in the bovine embryo "Pluripotency genes are implicated in mouse embryonic genome activation (EGA) and pluripotent lineage specification. ...Our findings affirm: firstly, the core triad of pluripotency genes is probably not implicated in bovine EGA since their proteins were not detected during pre-EGA phase, despite the transcripts for OCT4 and SOX2 were present. Secondly, an earlier ICM specification of transcripts and proteins of SOX2 and NANOG makes them pertinent candidates of bovine pluripotent lineage specification than OCT4." Vascular changes in the corpus luteum during early pregnancy in the cow "The present study determined vascular changes in the bovine corpus luteum (CL) at Day 16 (early maternal recognition period) and Day 40 in early pregnancy and compared them to the CL from Day 12 and Day 16 of the estrous cycle. ...The results suggest that there is no difference in vascular structure between non-pregnant and pregnant luteal tissue during the early maternal recognition period (Day 16). " Genome-wide expression profiling reveals distinct clusters of transcriptional regulation during bovine preimplantation development in vivo "Bovine embryos can be generated by in vitro fertilization or somatic nuclear transfer; however, these differ from their in vivo counterparts in many aspects and exhibit a higher proportion of developmental abnormalities. Here, we determined for the first time the transcriptomes of bovine metaphase II oocytes and all stages of preimplantation embryos developing in vivo up to the blastocyst using the Affymetrix GeneChip Bovine Genome Array which examines approximately 23,000 transcripts."

More recent papers

This table allows an automated computer search of the external PubMed database using the listed "Search term" text link. This search now requires a manual link as the original PubMed extension has been disabled. The displayed list of references do not reflect any editorial selection of material based on content or relevance. References also appear on this list based upon the date of the actual page viewing. References listed on the rest of the content page and the associated discussion page (listed under the publication year sub-headings) do include some editorial selection based upon both relevance and availability. More? References | Discussion Page | Journal Searches | 2019 References | 2020 References Search term: Bovine Embryology <pubmed limit=5>Bovine Embryology</pubmed>

Taxon

Bos taurus

Genbank common name: cow, bovine, domestic cattle

Taxonomy Id: 9913 Rank: species

Genetic code: Translation table 1 (Standard)

Mitochondrial genetic code: Translation table 2 (Vertebrate Mitochondrial)

Lineage( abbreviated ): Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; Eutheria; Laurasiatheria; Cetartiodactyla; Ruminantia; Pecora; Bovidae; Bovinae; Bos; Bos taurus

Bovine Development

The table below shows the general timing of early development stages in the bovine embryo, as well as comparing this to other domestic species. Implantation in the uterus occurs between 30-35 days. Species 1 cell (hours) 8 cell (days) Blastocyst (days) Enter Uterus (days) Length of Gestation (days) Cattle 24 3 8 3.5 281 Horse 24 3 6 5 337 Sheep 24 2.5 7 3 148 Swine 14-16 2 6 2 114 (Data: Oklahoma State University Learning Reproduction in Farm Animals)

Cattle Gestation Periods (Bovine Development)   Breed Average Days (±7–10 days) Angus 281 Ayrshire 279 Brahman 292 Brown Swiss 290 Charolais 289 Guernsey 283 Hereford 285 Holstein 279 Jersey 279 Limousin 289 Shorthorn 282 Simmental 289

General Overview

A historic general descriptive overview.

• First month (28 days) - The embryonic period, the embryo is 9 to 10 mm long and the first signs of extremities appear.
• Second month (30 to 60 days) - The extremities develop. The pharyngeal cleft closes in the beginning of this month. The sternum still has a longitudinal fissure in the middle, closing toward the end of the eighth week. At the end of the second month at the end of each extremity are a little conical elevation, which is colorless and transparent. This is the first indication of the hoof. The length of the fetus is 48 mm In the ninth week its length is 8 cm.
• Third month (60 to 90 days) - Toward the end of this month the four stomachs may be recognized. The fetus measures 14 cm. in length. The scrotum is present.
• Fourth month (90 to 120 days) - In the beginning of the fourth month the hoofs become quite, distinct ; they are firm, non-transparent, and have a yellow color. The fetus is about 24 cm. long and weighs up to 2 kg. (Frauck).
• Fifth month (120 to 150 days) - In the beginning of the month the first tentaculse (tactile hairs) appear on the lips, chin, upper eyelid, and orbital arch. The teats are plainly visible. The testicles descend into the scrotum. The fetus, is about 35 cm. long and weighs 2.5 to 3 kg.
• Sixth month (150 to 180 days) - The eyelashes are more developed. The foetus is about 46 cm. long. The whole body is still naked excepting the lips and eyelids.
• Seventh month (180 to 210 days) - At the end of this month a few long hairs appear at the end of the tail; also hairs about the coronet and on the spots where the horns appear. The foetus is about 60 cm. long.
• Eighth month (210 to 240 days) - The back begins to be covered with hair, also along the edges of the ears. The length of the fetus toward the 32d week is 65 cm, and toward the end of this month 75 cm. (Franck).
• Ninth month - In the beginning the whole body is covered with hair and increases greatly in size. The fetus measures from 80 to 100 cm.
• Tenth month - beginning this month the fetus becomes mature.

Bovine Estrous Cycle

Specific hormone concentrations are not shown in the above graph, only the relative hormone levels at different times during the cycle.

Links: Estrous Cycle

Oocyte Development

Bovine ovarian follicle BMP15 and GDF9 expression

Morula and Blastocyst

Bovine morula and blastocyst.

Bovine Morula (day 4)

Bovine Blastocyst (day 7)

Bovine stem cell marker expression

Links: Image - Morula and Blastocyst | Morula A | Blastocyst F | Blastocyst G | Bovine Development | Morula | Blastocyst

Placenta

Fetal Circulation of a Calf Placentation is epitheliochorial, where the maternal epithelium of the uterus comes in contact with the chorion, considered as primitive. The arrows indicate the direction in which the blood flows. A, Heart; B, umbilical opening; C, portion of the chorion. 1, Anterior aorta; 2, posterior aorta; 3 anterior vena cava; 4, posterior vena cava; 5, duct of Botalli; part of Botalli's duct posterior to the heart (sketched somewhat too long, but was necessary in order to demonstrate it) ; 6, umbilical arteries; 7, umbilical vein; 7', some of its branches; 8, portal vein; 9, ductus venosus; 10, portal veins: 11, pulmonary artery; 11', some of its branches; 12, pulmonary veins; 13, tuberculum Loweri; 14, chorion papillae. Figure: DeBruin Bovine Obstetrics (1910) Links: Placenta Development

Genital Development

Testis

The male bovine (bull) first development of the testis at the genital ridge is triggered by SRY expression following the timeline shown below.

• Day 32 - (CRL 12) Genital ridges first appeared
• Day 37 - (CRL 18) SRY expression begins
• Day 39 - (CRL 20) SRY expression peaks
• Day 42 - (CRL 27) Testis cords distinguishable

Links: Testis Development

Ovary

Links: Ovary Development

Ovarian Development Model A - The development of the ovary commences at the mesonephric surface epithelium (yellow cells) in the location of the future gonadal ridge. B - Some mesonephric surface epithelial cells change phenotype into GREL (Gonadal Ridge Epithelial-Like) cells (yellow-blue cells). C - The GREL cells proliferate and the basal lamina underlying the mesonephric surface epithelium breaks down allowing stromal cells (green) to penetrate into the gonadal ridge. D - GREL cells continue to proliferate and PGCs (grey) migrate into the ridge between the GREL cells. Mesonephric stroma including vasculature (red) continues to penetrate and expand in the ovary. E - Oogonia proliferate and stroma penetrates further towards the ovarian surface enclosing oogonia and GREL cells into ovigerous cords. The cords are surrounded by a basal lamina at their interface with stroma, but are open to the ovarian surface. Stromal areas including those between the ovigerous cords contain capillaries. F - A compartmentalization into cortex and medulla becomes obvious. The cortex is characterised by alternating areas of ovigerous cords and stroma, whereas the medulla is formed by stromal cells, vasculature and tubules originating from the mesonephros (rete ovarii). Once stroma penetrates below the cells on the surface it spreads laterally. The GREL cells at the surface are then aligned by a basal lamina at their interface with the stroma and begin to differentiate into typical ovarian surface epithelium (yellow cells). Some germ cells at the surface are also compartmentalized to the surface as stroma expands below it. G - Ovigerous cords are partitioned into smaller cords and eventually into follicles. These contain GREL cells that form granulosa cells (blue cells) and oogonia that form oocytes. The first primordial follicles appear in the inner cortex-medulla region, surrounded by a basal lamina. A now fully intact basal lamina underlies multiple layers of surface epithelial cells. H - At the final stage the surface epithelium becomes mostly single-layered and a tunica albuginea, densely packed with fibres, develops from the stroma below the surface epithelial basal lamina. Some primordial follicles become activated and commence development into primary and preantral follicles.

References

Search Pubmed

Search Pubmed: bovine development

External Links

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• Oklahoma State University Learning Reproduction in Farm Animals

Glossary Links

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Cite this page: Hill, M.A. (2024, April 18) Embryology Bovine Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Bovine_Development

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G