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Titolo:
CHARACTERIZATION OF ENDOCRINE EVENTS DURING THE PERIESTROUS PERIOD INSHEEP AFTER ESTROUS SYNCHRONIZATION WITH CONTROLLED INTERNAL-DRUG RELEASE (CIDR) DEVICE
Autore:
VANCLEEFF J; KARSCH FJ; PADMANABHAN V;
Indirizzi:
UNIV MICHIGAN,REPROD SCI PROGRAM,300 N INGALLS BLDG,ROOM 1110 ANN ARBOR MI 48109 UNIV MICHIGAN,REPROD SCI PROGRAM ANN ARBOR MI 48109 UNIV MICHIGAN,DEPT PHYSIOL ANN ARBOR MI 48109 UNIV MICHIGAN,DEPT PEDIAT ANN ARBOR MI 48109
Titolo Testata:
Domestic animal endocrinology
fascicolo: 1, volume: 15, anno: 1998,
pagine: 23 - 34
SICI:
0739-7240(1998)15:1<23:COEEDT>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
DEER CERVUS-ELAPHUS; LUTEINIZING-HORMONE; LH-SECRETION; PROGESTERONE; ESTRADIOL; ESTRUS; CYCLE; OVULATION; SURGE; EWE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
26
Recensione:
Indirizzi per estratti:
Citazione:
J. Vancleeff et al., "CHARACTERIZATION OF ENDOCRINE EVENTS DURING THE PERIESTROUS PERIOD INSHEEP AFTER ESTROUS SYNCHRONIZATION WITH CONTROLLED INTERNAL-DRUG RELEASE (CIDR) DEVICE", Domestic animal endocrinology, 15(1), 1998, pp. 23-34

Abstract

The Controlled Internal Drug Releasing (CIDR) device is an intravaginal pessary containing progesterone (P-4) designed for synchronizing estrus in ruminants. To date, there has been little information available on the timing, duration, and quality of the follicular phase after CIDR removal and how those characteristics compare with natural periovulatory endocrine events. The present communication relates the resultsof methods we used to characterize the endocrine events that followedCIDR synchronization. Breeding-season ewes were given an injection (10 mg) of Lutalyse (PGF(2 alpha),), and then studied during three consecutive estrous cycles, beginning in the luteal phase after the estrus induced by PGF(2 alpha),. Cycle 1 estrus was synchronized with 1 CIDR (Type G) inserted for 8 d beginning 10 d after PGF(2 alpha). Cycles 2 and 3 were synchronized with two CIDRs for 8 d beginning 10 d after previous CIDR removal. Cycle 1 estrous behavior and serum gonadotropins showed a follicular phase (the interval from CIDR withdrawal to gonadotropin surge [surge] peak) of 38.2 +/- 1.5 hr. Two CIDRs lengthened the interval to 46.2 +/- 1.5 hr (P < 0.0001). At CIDR removal, circulating P-4 concentrations were higher in ewes treated with two CIDRs (5.1 /- 0.3 and 6.4 +/- 0.4 ng/mL in Cycles 2 and 3 vs. 2.7 +/- 0.3 ng/mL in Cycle 1), whereas estradiol concentrations were higher in the 1 CIDR cycle (3.3 +/- 0.5 pg/mL in Cycle 1 vs. 0.5 +/- 0.1, and 0.7 +/- 0.2pg/mL in Cycles 2 and 3), suggesting that the lower levels of P-4 achieved with one CIDR was not sufficient to arrest follicular development. There were no differences in any other endocrine variable. Both oneand two CIDR synchronization concentrated surges within a 24-hr period in 92% of the ewes in Cycles 1 and 2. Cycle 3 ewes were euthanized at estimated luteal, early follicular, late follicular, LH surge, and secondary FSH rise timepoints. Endocrine data and ovaries showed that 88% of the ewes synchronized with two CIDRs were in the predicted stageof the estrous cycle. These data demonstrate that the CIDR device applied during the luteal phase effectively synchronizes estrus and results in a CIDR removal-to-surge interval of similar length to a natural follicular phase. (C) Elsevier Science Inc. 1998.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 21:08:57