Concentrations of progesterone and oxytocin receptors in endometrium of postpartum cows expected to have a short or normal oestrous cycle

Zollers, W.G.; Garverick, H.A.; Smith, Michael F.; Moffatt, R. J.; Salfen, B E; Youngquist, R.S.

doi:10.1530/jrf.0.0970329

Cited by 86 publications

(53 citation statements)

References 5 publications

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“…Outro efeito benéfico da progesterona exógena na vaca em anestro pós-parto é o de prolongar a vida do corpo lúteo formado a partir do folículo selecionado neste período, provavelmente por inibir receptores de ocitocina no endométrio e diminuir a probabilidade da ocorrência de ciclos curtos (Zollers et al, 1993).…”

Section: Resultsunclassified

Taxa de prenhez de vacas Nelore lactantes tratadas com progesterona associada à remoção temporária de bezerros ou aplicação de gonadotrofina coriônica eqüina

Ereno

Barreiros²,

Seneda

et al. 2007

R. Bras. Zootec.

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Avaliaram-se os efeitos da remoção temporária de bezerros (RTB) ou da aplicação de gonadotrofina coriônica eqüina (eCG) na taxa de prenhez (TP) de vacas Nelore lactantes tratadas com um dispositivo intravaginal liberador de progesterona (DILP). No experimento 1, 83 vacas Nelore e 102 mestiças (Nelore × Red Angus) foram distribuídas em três grupos. Em dia aleatório do ciclo estral (D0), os animais do grupo 1 foram tratados com benzoato de estradiol (BE; 2,5 mg, IM, Estrogin®) e um DILP (1 g de progesterona, DIB®), removido no D9, quando também se administrou d-cloprostenol (150 µg, IM, Prolise®) e aproximadamente 12 horas após identificação do estro realizou-se a inseminação artificial. No grupo 2 (IATF), o tratamento foi semelhante ao aplicado no grupo 1, porém, administrou-se uma segunda dose de benzoato de estradiol (1 mg) no D10 e 30-36 horas mais tarde realizou-se a inseminação artificial em tempo fixo (IATF). No grupo 3 (IATF/RTB), os bezerros foram removidos a partir do D9 até a inseminação artificial com tempo fixo (IATF). As taxas de prenhez para as vacas Nelore e mestiças foram, respectivamente, de 7,69 e 41% (Controle); 23,52 e 59,57% (IATF); 69,44 e 55,81% (IATF/RTB). No experimento 2, 255 vacas Nelore lactantes foram distribuídas em três grupos. Os animais do grupo 4 (IATF) foram tratados com benzoato de estradiol (2 mg) e um DILP (1,9 g de progesterona, CIDR-B®) no D0 e no D8 sofreram remoção do DILP no D8 e administração de 25 mg de dinoprost (IM, Lutalyse®). No D9, foi aplicado benzoato de estradiol (1 mg) realizando-se a IATF 30-36 horas mais tarde. No grupo 5 (IATF/RTB), os bezerros foram removidos no D9 até a IATF. O grupo 6 (eCG) foi semelhante ao IATF, exceto pela aplicação de eCG no D9 (400 UI, IM, Novormon®). As taxas de prenhez foram de 50,57 (IATF), 53,57 (IATF/RTB) e 54,76% (eCG). A associação de RTB ao tratamento hormonal com DILP aumenta as taxas de prenhez, enquanto a adição de eCG ao tratamento não melhora as taxa de prenhez de vacas Nelore lactantes ciclando e em boa condição corporal.

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Section: Resultsunclassified

Taxa de prenhez de vacas Nelore lactantes tratadas com progesterona associada à remoção temporária de bezerros ou aplicação de gonadotrofina coriônica eqüina

Ereno

Barreiros²,

Seneda

et al. 2007

R. Bras. Zootec.

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“…no behavioural oestrus; Kyle et al, 1992) and is generally (>70%) followed by a short cycle, usually containing just one follicle wave. This first luteal phase is of short duration because of the premature release of prostaglandin F2α (PGF2α; , thought to be induced by increased oestradiol produced from the formation of the postovulatory dominant follicle on days 5 to 8 of the cycle, inducing premature oestradiol and oxytocin (Zollers et al, 1993) receptors. Thus, the CL, which also secretes lower quantities of progesterone, regresses prematurely around days 8 to 10 of the cycle, with the second ovulation (of this postovulatory dominant follicle) occurring around days 9 to 11 after the first ovulation.…”

Section: Introductionmentioning

confidence: 99%

Parturition to resumption of ovarian cyclicity: comparative aspects of beef and dairy cows

Crowe

Diskin

Williams

2014

Animal

107

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There is a variable anoestrous period following parturition in the cow. Follicular growth generally resumes within 7 to 10 days in the majority of cows associated with a transient FSH rise that occurs within 3 to 5 days of parturition. Dairy cows that are not nutritionally stressed generally ovulate their first postpartum dominant follicle (~15 days), whereas beef suckler cows in good body condition normally have a mean of 3.2 ± 0.2 dominant follicles (~30 days) to first ovulation; moreover, beef cows in poor body condition have a mean of 10.6 ± 1.2 dominant follicles (~70 to 100 days) to first ovulation. The lack of ovulation of dominant follicles during the postpartum period is associated with infrequent LH pulses, with both maternal-offspring bonding and low body condition score (BCS) at calving being implicated as the predominant causes of delayed resumption of cyclicity in nursed beef cows. In dairy cows, the normal pattern of early resumption of ovulation may be delayed in high-yielding Holstein type cows generally owing to the effects of severe negative energy balance, dystocia, retained placental membranes and uterine infections. First ovulation, in both dairy and beef cows, is generally silent (i.e., no behavioural oestrus) and followed by a short inter-ovulatory interval (>70%). The key to optimizing the resumption of ovulation in both beef and dairy cows is appropriate pre-calving nutrition and management so that cows calve down in optimal body condition (BCS; 2.75 to 3.0) with postpartum body condition loss restricted to < 0.5 BCS units.

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“…All samples were assayed. Estradiol-17β was measured in blood samples collected on Days 7,8,9,13,16,20, 23 and 24.…”

Section: Hormone Assaysmentioning

confidence: 99%

Inhibitory Effects of CIDR-based Ovulation-synchronization Protocols on Uterine PGF2.ALPHA. Secretion at the Following Luteal Phase in Early Postpartum Non-cycling Beef Cows

Sakase

Kawate

Nakagawa

et al. 2006

Journal of Reproduction and Development

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Abstract. We investigated whether CIDR-based ovulation-synchronization protocols inhibit secretion of prostaglandin (PG) F2α from the uterus in the following luteal phase in non-cycling beef cows. Ten early (a month) postpartum non-cycling Japanese Black beef cows were treated with (1) Ovsynch (GnRH analogue on Day 0, PGF2α analogue on Day 7, and GnRH analogue on Day 9; n=3), (2) Ovsynch+CIDR (Ovsynch protocol plus a CIDR for 7 days from Day 0; n=4), or (3) estradiol benzoate (EB) Ovsynch+CIDR (EB on Day 0 in lieu of the first GnRH treatment followed by the Ovsynch+CIDR protocol; n=3). An oxytocin challenge was administered on Day 24 to examine uterine PGF2α secretion. Plasma concentrations of 13,14-dihydro-15-keto-PGF2α were lower at 30-120 min after oxytocin administration in the Ovsynch+CIDR group and 75 min after administration in the EB Ovsynch+CIDR group than in the Ovsynch group (P<0.05). Plasma progesterone concentrations were higher from Days 1 to 7 in the Ovsynch+CIDR group and from Days 1 to 5 in the EB Ovsynch+CIDR group than in the Ovsynch group (P<0.05). The progesterone concentrations were higher on Days 27 and 29 in both CIDR-treated groups than in the Ovsynch group (P<0.05). In conclusion, in noncycling beef cows, CIDR-based ovulation-synchronization protocols inhibit uterine PGF22α secretion in the following luteal phase and prevent premature luteolysis as is seen with the Ovsynch protocol. Key words: Beef cow, CIDR-based ovulation-synchronization protocol, Non-cycling, Ovsynch, Uterine PGF2α secretion (J. Reprod. Dev. 52: [497][498][499][500][501][502] 2006) vulation synchronization, such as Ovsynch or its modified protocols, has been used for timed artificial insemination (timed-AI) in postpartum beef cows [1][2][3][4][5]. In previous studies, we reported that a protocol using an intravaginal controlled internal drug release (CIDR) device in addition to Ovsynch (Ovsynch+CIDR) and another protocol using estradiol benzoate (EB) in lieu of the first g o n a d o t r o p i n -r e l e a s i n g h o r m o n e ( G n R H ) t r e a t m e n t o f t h e O v s y nc h +C I DR p ro t o co l improved the rate of conception following timed-AI in suckled early postpartum beef cows [4,5]. An improved conception rate by the CIDR-based

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Concentrations of progesterone and oxytocin receptors in endometrium of postpartum cows expected to have a short or normal oestrous cycle

Cited by 86 publications

References 5 publications

Taxa de prenhez de vacas Nelore lactantes tratadas com progesterona associada à remoção temporária de bezerros ou aplicação de gonadotrofina coriônica eqüina

Taxa de prenhez de vacas Nelore lactantes tratadas com progesterona associada à remoção temporária de bezerros ou aplicação de gonadotrofina coriônica eqüina

Parturition to resumption of ovarian cyclicity: comparative aspects of beef and dairy cows

Inhibitory Effects of CIDR-based Ovulation-synchronization Protocols on Uterine PGF2.ALPHA. Secretion at the Following Luteal Phase in Early Postpartum Non-cycling Beef Cows

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