This study examines whether the transfer of a fresh in vitro-produced (IVP) embryo can avoid the risk of twin pregnancy without reducing the fertility of a cow. The study population was comprised of 416 lactating dairy cows synchronized for oestrus: 294 were fixed-time inseminated (AI cows), and 122 were given GnRH treatment at the time of embryo transfer (ET) an IVP embryo (ET cows). Of the 416 cows, 167 (40.1%) became pregnant. Twin pregnancy was recorded in 20.8% of the AI pregnant cows (21/101), whereas no ET cows had twins (0/66). Significant interaction (p <.01) was observed between breeding technique and the period of the year for the likelihood of pregnancy. This meant that using AI cows during the warm period (May–September) as reference, the odds ratio for pregnancy in ET cows during the warm period was 3.4 (p =.001). In conclusion, transfer of a single fresh IVP embryo proved useful to prevent the risk of twin pregnancy without affecting fertility.

Transfer of a single fresh in vitro-produced embryo may prevent twin pregnancy without compromising the fertility of the cow / Lopez-Gatius, F.; Saleri, R.; De Rensis, F.; Llobera-Balcells, M.; Garcia-Ispierto, I.. - In: REPRODUCTION IN DOMESTIC ANIMALS. - ISSN 0936-6768. - (2022), pp. 1-6. [10.1111/rda.14079]

Transfer of a single fresh in vitro-produced embryo may prevent twin pregnancy without compromising the fertility of the cow

Saleri R.
Investigation
;
De Rensis F.
Investigation
;
2022

Abstract

This study examines whether the transfer of a fresh in vitro-produced (IVP) embryo can avoid the risk of twin pregnancy without reducing the fertility of a cow. The study population was comprised of 416 lactating dairy cows synchronized for oestrus: 294 were fixed-time inseminated (AI cows), and 122 were given GnRH treatment at the time of embryo transfer (ET) an IVP embryo (ET cows). Of the 416 cows, 167 (40.1%) became pregnant. Twin pregnancy was recorded in 20.8% of the AI pregnant cows (21/101), whereas no ET cows had twins (0/66). Significant interaction (p <.01) was observed between breeding technique and the period of the year for the likelihood of pregnancy. This meant that using AI cows during the warm period (May–September) as reference, the odds ratio for pregnancy in ET cows during the warm period was 3.4 (p =.001). In conclusion, transfer of a single fresh IVP embryo proved useful to prevent the risk of twin pregnancy without affecting fertility.
Transfer of a single fresh in vitro-produced embryo may prevent twin pregnancy without compromising the fertility of the cow / Lopez-Gatius, F.; Saleri, R.; De Rensis, F.; Llobera-Balcells, M.; Garcia-Ispierto, I.. - In: REPRODUCTION IN DOMESTIC ANIMALS. - ISSN 0936-6768. - (2022), pp. 1-6. [10.1111/rda.14079]
File in questo prodotto:
File Dimensione Formato  
Reprod Domestic Animals - 2022 - L pez‐Gatius - Transfer of a single fresh in vitro‐produced embryo may prevent twin.pdf

non disponibili

Tipologia: Versione (PDF) editoriale
Licenza: Creative commons
Dimensione 465 kB
Formato Adobe PDF
465 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2915490
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 0
  • ???jsp.display-item.citation.isi??? 1
social impact