Bovine Development

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.

Links: Category:Bovine

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Some Recent Findings

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."

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)

Morula and Blastocyst

Bovine morula and blastocyst.

Bovine Morula (day 4)

Bovine Blastocyst (day 7)

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

Genital Development

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

References

Search Pubmed

Search Pubmed: bovine development

External Links

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• Oklahoma State University Learning Reproduction in Farm Animals

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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