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Titolo:
EFFECTS OF ADMINISTRATION OF HUMAN CHORIONIC GONADOTROPIN OR PROGESTERONE BEFORE MATERNAL RECOGNITION OF PREGNANCY ON BLASTOCYST DEVELOPMENT AND PREGNANCY IN SHEEP
Autore:
NEPHEW KP; CARDENAS H; MCCLURE KE; OTT TL; BAZER FW; POPE WF;
Indirizzi:
OHIO STATE UNIV,DEPT ANIM SCI COLUMBUS OH 43210 OHIO STATE UNIV,DEPT ANIM SCI COLUMBUS OH 43210 TEXAS A&M UNIV,DEPT ANIM SCI COLL STN TX 77843
Titolo Testata:
Journal of animal science
fascicolo: 2, volume: 72, anno: 1994,
pagine: 453 - 458
SICI:
0021-8812(1994)72:2<453:EOAOHC>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
OVINE TROPHOBLAST PROTEIN-1; ESTROUS-CYCLE; CORPUS-LUTEUM; EMBRYO SURVIVAL; EWES; CONCEPTUS; HORMONE; CATTLE; ESTRADIOL;
Keywords:
HUMAN CHORIONIC GONADOTROPIN; FERTILITY; PREGNANCY; EMBRYOS; SHEEP;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
48
Recensione:
Indirizzi per estratti:
Citazione:
K.P. Nephew et al., "EFFECTS OF ADMINISTRATION OF HUMAN CHORIONIC GONADOTROPIN OR PROGESTERONE BEFORE MATERNAL RECOGNITION OF PREGNANCY ON BLASTOCYST DEVELOPMENT AND PREGNANCY IN SHEEP", Journal of animal science, 72(2), 1994, pp. 453-458

Abstract

A series of four experiments with 258 ewes was conducted to determinewhether blastocyst size could be altered before normal luteolysis and, if so, how this affected fertility. In Exp. 1 and 2, nonmated and mated ewes, respectively, were treated with hCG (100 IU), progesterone (12 mg), or vehicle on d 11.5 (d 0 = onset of estrus). In Exp. 3 and 4,field trials were conducted to compare the effects of either hCG or progesterone treatment on d 11.5 on subsequent pregnancy rates. In Exp.1, hCG transiently increased (P <.01) concentrations of progesterone and estradiol in plasma, whereas progesterone treatment increased onlyplasma progesterone. Neither hCG nor progesterone affected the duration of the estrous cycle. In Exp. 2, d-13 blastocysts were longer (3.5 /- 1.6 vs.8 +/- .5 cm; Mean +/- SE; P <.05), and concentrations of protein and interferon tau (IFN tau) in uterine flushings were greater (10.7 vs 1.2 mu g; P < .05) in hCG- than in vehicle-treated ewes. Progesterone treatment did not affect blastocyst development. In Exp. 3, pregnancy rates tended to be greater (P < .10) in ewes given hCG than inthose given vehicle (44/47; 94% vs 40/48; 83%); however, administration of progesterone in Exp. 4 had no effect on pregnancy rates (P <.14;41/45; 91% vs 37/46; 80%; control ewes). These results indicate that treatment with hCG on d 11.5 stimulated uterine secretions and conceptus growth sufficiently to influence pregnancy rates.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 12:52:39