mpact of oocyte donor age and breed on in vitro embryo production in cattle, and relationship of dairy and beef embryo recipients on pregnancy and the subsequent performance of offspring: A revie

Autor(es)

Baruselli, Pietro S. ^[1] ; Rodrigues, Carlos A. ^[2] ; Ferreira, Roberta M. ^[1] ; Sales, Jose Nelio S. ^[3] ; Elliff, Flavia M. ^[1] ; Silva, Laisa G. ^[1] ; Viziack, Mariana P. ^[1] ; Factor, Luana ^[1] ; D'Occhio, Michael J. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Fac Vet Med & Anim Sci, Dept Anim Reprod, BR-05508270 Sao Paulo, SP - Brazil

^[2] Clin Vet SAMVET, Sao Carlos, SP - Brazil

^[3] Univ Fed Juiz de Fora, BR-36010041 Juiz De Fora, MG - Brazil

^[4] Univ Sydney, Fac Sci, Sch Life & Environm Sci, Sydney, NSW 2006 - Australia

• Tipo de documento: Artigo de Revisão
• Fonte: REPRODUCTION FERTILITY AND DEVELOPMENT; v. 34, n. 2, SI OCT 2021.
• Citações Web of Science: 0

Resumo

Genomic selection combined with in vitro embryo production (IVEP) with oocytes from heifer calves provides a powerful technology platform to reduce generation interval and significantly increase the rate of genetic gain in cattle. The ability to obtain oocytes with developmental competence from calves has been recognised for more than 60 years. There is renewed interest in the potential of this reproductive technology as the beef and dairy industries seek to identify and multiply animals that satisfy consumer demand for efficient utilisation of natural resources, with minimal environmental impact and high product quality. Heifer calves show a good follicular response to FSH stimulation and oocytes can be recovered by ovum pick-up (OPU). However, the efficiency of OPU/IVEP remains lower for calves compared with peripubertal heifers and cows, in both indicus (Zebu, Bos indicus) and taurus (Bos taurus) breeds. Indicus cattle generally have more follicles, yield a greater number of oocytes, and have a better IVEP outcome, compared with taurus cattle. The treatment of prepubertal heifers with bovine somatotrophin (bST) and propylene glycol before OPU/IVEP has yet to show a major improvement in embryo production. Holstein (taurus) dairy heifers derived from different reproductive technologies (AI, MOET, OPU/IVEP) showed a similar age at puberty and first-lactation milk production. OPU/IVEP Holstein embryos transferred to beef or dairy cows likewise yielded heifers with the same performance. The gains in productivity that can be achieved with strategic use of OPU/IVEP in heifer calves make this a relevant and highly important reproductive technology in cattle breeding. Ongoing optimisation of the technology is needed for the potential of OPU/IVEP in young donors to be fully realised. (AU)

• Processo FAPESP: 19/14679-1 - Estratégias para melhorar a produção in vitro de embriões (PIVE) de doadoras jovens das raças Holandês (Bos taurus), Gir (Bos indicus) e Nelore (Bos indicus)
• Beneficiário: Pietro Sampaio Baruselli
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 15/19563-0 - Estratégias para melhorar a competência oocitária e a produção in vitro de embriões em vacas Holandesas
• Beneficiário: Pietro Sampaio Baruselli
• Modalidade de apoio: Auxílio à Pesquisa - Regular