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Titolo:
NEW TECHNOLOGIES TO IMPROVE THE REPRODUCTIVE EFFICIENCY OF DAIRY-CATTLE
Autore:
GUILBAULT LA; POTHIER F; TWAGIRAMUNGU H; SIRARD MA;
Indirizzi:
UNIV LAVAL,CTR RECH BIOL REPROD ST FOY PQ CANADA UNIV LAVAL,DEPT ANIM SCI ST FOY PQ CANADA AGR & AGROALIMENTAIRE CANADA,CTR RECH & DEV BOVIN LAITIER & PORC LENNOXVILLE PQ CANADA BOVITEQ INC ST HYACINTHE PQ CANADA
Titolo Testata:
Canadian journal of animal science
, volume: 78, anno: 1998, supplemento:, S
pagine: 113 - 129
SICI:
0008-3984(1998)78:<113:NTTITR>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
GONADOTROPIN-RELEASING-HORMONE; OVARIAN FOLLICULAR DYNAMICS; DETECTABLE LH SURGE; DOMINANT FOLLICLE; ESTROUS-CYCLE; DEVELOPMENTAL COMPETENCE; BOVINE OOCYTES; INVITRO FERTILIZATION; IN-VITRO; SUPEROVULATED HEIFERS;
Keywords:
ARTIFICIAL INSEMINATION; EMBRYO TRANSFER; TRANSGENESIS; SEXING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
67
Recensione:
Indirizzi per estratti:
Citazione:
L.A. Guilbault et al., "NEW TECHNOLOGIES TO IMPROVE THE REPRODUCTIVE EFFICIENCY OF DAIRY-CATTLE", Canadian journal of animal science, 78, 1998, pp. 113-129

Abstract

The genetic potential of Canadian dairy livestock has improved considerably during the past 25 years, due mainly to a massive increase in the use of artificial insemination and embryo transfer. As a result of recent developments in reproductive biotechnology, a marked improvement in the efficient use of artificial insemination and embryo transfer can soon be expected. For example, the synchronization of follicular waves has greatly improved the precision of oestrus synchronization programs, reduced and even eliminated the need for oestrus detection, andallowed fixed-time artificial insemination. The efficiency of embryo production, both in terms of the number of embryos produced and monitoring of production-related operations, has also been improved by controlling ovarian follicular dominance. Major advances have been made in the in vitro production of embryos as a result of transvaginal ultrasound-guided aspiration of oocytes, and the discovery of the effect of follicular status on oocyte quality and competence for embryonic development. Refinement of molecular biology tools related to increased availability of high quality cattle embryos has favoured the emergence of screening and transgenesis techniques. Thus, it is possible to know the sex of the embryo before its transfer by carrying out a molecular analysis of a biopsy using a specific Y chromosome-probe. The same type of approach is currently applied to detect animal carriers of the AA, BE and AB alleles for the kappa casein gene. Subjects who are carriersof BE alleles not only produce mote proteins but also a larger proportion of caseins. Finally, although slowed down by technical pitfalls, transgenesis applied to cattle leads us to consider applications aimedat an increased synthesis of caseins, a reduction of lactose and the production of human proteins in milk. Taken together, the application of the new reproductive biotechnologies will lead to a decrease in thegeneration interval, which in turn will greatly accelerate genetic advances.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 09:55:54