Twin pregnancy diagnosis and early embryonic loss after bilateral egg transfer in beef cattle.

Izaike, Yoshiaki; Сузукі, Осаму; Shimada, Kazuhiro; Fujita, Koichi; Kosugiyama, Motoaki

doi:10.1262/jrd1977.34.236

Cited by 11 publications

(1 citation statement)

References 7 publications

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“…They transferred embryos to the same breed of the recipient cattle or an unknown breed derived from IVF [ 69 , 70 ], but we transferred Japanese Black beef cattle embryos with smaller body size to bigger cross breed that had enough capacity to maintain and bear twins. In cattle, the survival rate of embryo is extremely low in the uterus contralateral to the CL [ 73 , 74 ]. We observed that when the fetus was lost in the ipsilateral side of the CL, its loss also occurred in the uterus present on the opposite side.…”

Section: Clarification Of Factors Affecting Embryo Bisectionmentioning

confidence: 99%

The contribution of efficient production of monozygotic twins to beef cattle breeding

Hashiyada

2017

Journal of Reproduction and Development

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Production of sires with high breeding potential is indispensable for prompt and reliable breeding using their semen in the cattle industry. Currently, in Japan, we aim to further the production of Japanese black sires via a new breeding system that uses genetically homologous monozygotic twins so that better growth performance and carcass traits can be translated to the increased production of beef with higher economic value. Several studies have reported that monozygotic twins are produced by embryo bisection. On the other hand, with the evolution and stabilization of in vitro fertilization technology, it has become possible to produce multiple monozygotic twin calves from blastomeres separated from a cleavage-stage embryo. This review attempts to clarify breeding practices through revalidation of the factors that affect the production efficiency of monozygotic twin calves by embryo bisection. Furthermore, the establishment of a system for monozygotic twin embryo production via the simplified technique of blastomere separation is reviewed while showing data from our previously performed studies.

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