Naturally monozygotic quadruplets in a Braford cow confirmed by DNA analysis: A case report.

Reproduction in Domestic Animals = Zuchthygiene
Andrés Rogberg-MuñozGuillermo Giovambattista

Abstract

Cattle are a monotocous species, despite naturally conceived multiple births are sometimes observed. Although the number of twins has consistently increased, triplet and quadruplet pregnancies represent 0.015% and 0.004% of the total births, respectively. Multiple births are the result of multiple ovulation and/or the spontaneous cleavage of one fertilized oocyte, which is known as monozygotic (MZ) twinning. In cattle, approximately 5% to 14% of all twin births are MZ, and births with more than two MZ calves are extremely rare. Monozygotic animals are genetically identical, and those derived from two or more zygotes are genetically different. Furthermore, the presence of placental vascular anastomosis can result in foetal chimerism. Notwithstanding, animals born as single calves can be chimeras when one of the foetal twins dies undetected in utero. Here, we used DNA testing to study the zygotic condition of an unusual female quadruplet born from a Braford cow bred in a multi-sire natural mating system without hormone stimulation. Two tissues with different embryological origin were sampled to test zygosity and possible chimerism. The results showed an identical genotype, confirming they all originated in an MZ pregnancy and sug...Continue Reading

References

Aug 1, 1992·Journal of Animal Science·S E Echternkamp
Jun 13, 2006·Theriogenology·N Silva del RíoP M Fricke
Aug 10, 2007·Journal of Animal Science·S E EchternkampK E Gregory
Apr 14, 2009·American Journal of Medical Genetics. Part C, Seminars in Medical Genetics·Geoffrey Machin
Oct 17, 2017·The Journal of Reproduction and Development·Yutaka Hashiyada
Aug 2, 2018·Twin Research and Human Genetics : the Official Journal of the International Society for Twin Studies·Shiqi LiuDawei Hu

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