Conceptus loss in Santa Inês ewes carrying twin pregnancies by natural mating or embryo transfer

Commercial application of reproductive biotechnologies such as multiple ovulation and embryo transfer depends on its overall efficiency. Sheep embryo transfer is gradually gaining wider adoption, but pregnancy rates after embryo transfer remain lower than those derived from natural mating for most b...

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Bibliographic Details
Published in:Theriogenology 2018-07, Vol.115, p.94-98
Main Authors: Ferreira-Silva, José Carlos, Freitas Neto, Leopoldo Mayer, Moura, Marcelo Tigre, Filho, Fernando Tenório, Oliveira, Luis Rennan Sampaio, Bartolomeu, Claudio Coutinho, Oliveira, Marcos Antonio Lemos
Format: Article
Language:English
Subjects:
Abortion, Veterinary - epidemiology
Animals
Breeding
Embryo Loss - veterinary
Embryo Transfer - veterinary
Female
Fertilization
Gemelar pregnancy
Humans
Litter Size
Ovis aries
Pregnancy
Pregnancy Rate
Pregnancy, Multiple
Ram effect
Reproduction
Sheep
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Summary:Commercial application of reproductive biotechnologies such as multiple ovulation and embryo transfer depends on its overall efficiency. Sheep embryo transfer is gradually gaining wider adoption, but pregnancy rates after embryo transfer remain lower than those derived from natural mating for most breeds. The work was aimed to evaluate embryonic and fetal losses in Santa Inês ewes carrying twin pregnancies by natural mating or embryo transfer. Ewes were subjected to synchronized natural mating by ram effect or used as recipients for embryo transfer. Ewes diagnosed as carrying twin pregnancies at day 25 were used in the experiment (n = 42). Conceptus viability was monitored by ultrasonography on days 30, 35, 40, 45, 50, and 55 after conception. Conceptus loss was similar (P > 0.05) within natural mating 11/42 (26.19%) and embryo transfer 14/42 (33.34%). However, overall embryonic loss (80.0%) was greater (P 
ISSN:0093-691X
1879-3231
DOI:10.1016/j.theriogenology.2018.04.024