Effects of human chorionic gonadotropin pretreatment on endocrine, cytological and prostaglandin F2α receptor patterns of the bovine corpus luteum

Bennett, William A.; Gonzalez, L.V.; Stuart, M J; Fuquay, John W.

doi:10.1016/0378-4320(89)90091-2

Cited by 7 publications

(2 citation statements)

References 11 publications

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“…The higher incidence of induced ovulations among cows treated on day 7 can be attributed to several factors. Dominant follicles present on day 7 are less likely to be atretic (Rajakoski, 1960;Merz et al, 1981 ;Bennett et al, 1989; Taylor & Rajamahendran, 1991 b) and have been reported to possess more luteinizing hormone receptors (Bennett et al, 1989). Savio et al (1990) found that the dominant follicle was ovulatory in about 93% of heifers after regression of the corpora lutea using a single injection of prostaglandin F2a on day 7 after oestrus.…”

Section: Discussionmentioning

confidence: 99%

Effect of human chorionic gonadotrophin on dominant follicles in cows: formation of accessory corpora lutea, progesterone production and pregnancy rates

Rajamahendran¹,

Sianangama²

1992

Reproduction

114

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Thirty-four lactating Holstein cows were randomly assigned to four groups for treatment with human chorionic gonadotrophin (hCG, 1000 iu) at insemination day 0 (n = 8) or 7 (n = 9) or 14 days (n = 9) after insemination or with no hCG treatment (control, n = 8). Ultrasound imaging of the ovaries and plasma progesterone measurements were carried out to determine follicular dynamics and corpus luteum growth and function. Rates of formation of accessory corpora lutea were higher among cows treated on days 0 (three cows), 7 (seven cows) or 14 (four cows) than in the controls (one cow). Total corpus luteum diameter was greater (P less than 0.01) among hCG-treated cows than in controls 7-42 days after insemination. Concentrations of progesterone in plasma were significantly (P less than 0.05) higher in cows treated with hCG on days 7 or 14 than in those treated on day 0 or in controls, at days 18, 35 or 42 after insemination. Seven of the cows treated on day 7 became pregnant, whereas four, four and three cows treated on days 0 or 14 and control cows became pregnant, respectively. The results suggest that hCG treatment at 7 days after insemination could be used to produce accessory corpora lutea, raise plasma progesterone concentration and hence reduce the incidence of early embryonic mortality in cattle.

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Section: Discussionmentioning

confidence: 99%

Effect of human chorionic gonadotrophin on dominant follicles in cows: formation of accessory corpora lutea, progesterone production and pregnancy rates

Rajamahendran¹,

Sianangama²

1992

Reproduction

114

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“…Para Binelli et al (2001) DIAZ et al, 1998;FRICKE et al, 1993) bem como atua diretamente sobre o corpo lúteo original. Neste caso, o efeito luteotrófico se dá por meio do aumento no tamanho das pequenas e grandes células luteínicas (SCHMITT et al, 1996b), longa meia-vida da hCG e lenta degradação do complexo hCG-rceptor para LH nas células da granulosa (FRICKE et al, 1993;SCHMITT et al, 1996a), aumento na proporção das pequenas células luteínicas do corpo lúteo original (BENNETT et al, 1989) e aumento no peso do corpo lúteo (BREUEL et al, 1989). A resultante desses efeitos é o aumento nas dimensões do corpo lúteo e na produção de progesterona.…”

Section: ) Variáveis Contínuasunclassified

A remoção do folículo dominante como estratégia anti-luteolítica em bovinos

Machado¹

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Ao professor Dr. MÁRIO BINELLI, pelo apoio e entusiasmo irrestritos em nos orientar, e pelos seus valiosos ensinamentos e profunda amizade demonstrados ao longo desta jornada. Ao Prof. Dr. RENATO CAMPANARUT BARNABE, ex-Coordenador do Curso de Pós-Graduação em Reprodução Animal e meu orientador nos primeiros semestres do meu treinamento, pela confiança depositada e pelo apoio e dedicação prestados para o cumprimento de nossa missão como acadêmico da FMVZ da USP. Sua amizade, carinho e compreensão jamais serão esquecidos. `A EMBRAPA pela oportunidade de treinamento e à EMBRAPA PECUÁRIA SUDESTE pelo apoio técnico, logístico e financeiro ao projeto experimental. Menção especial merecem os senhores chefes: Drs. AIRTON E NÉLSON pelo apoio, compreensão e apreço demonstrados ao longo de nosso treinamento.

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Characteristics of corpus luteum formed from the first wave dominant follicle following hCG in cattle

Sianangama

Rajamahendran

1996

Theriogenology

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Effects of human chorionic gonadotropin pretreatment on endocrine, cytological and prostaglandin F2α receptor patterns of the bovine corpus luteum

Cited by 7 publications

References 11 publications

Effect of human chorionic gonadotrophin on dominant follicles in cows: formation of accessory corpora lutea, progesterone production and pregnancy rates

Effect of human chorionic gonadotrophin on dominant follicles in cows: formation of accessory corpora lutea, progesterone production and pregnancy rates

A remoção do folículo dominante como estratégia anti-luteolítica em bovinos

Characteristics of corpus luteum formed from the first wave dominant follicle following hCG in cattle

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