Effect of treatment with progesterone and oestradiol benzoate on ovarian follicular turnover in postpartum anoestrous cows and cows which have resumed oestrous cycles

Rhodes, F.M.; Burke, Christopher R.; Clark, Barbara A.; Day, M. L.; Macmillan, K.L.

doi:10.1016/s0378-4320(01)00141-5

Cited by 76 publications

(39 citation statements)

References 27 publications

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“…4), independente dos DPP. Protocolos à base de progesterona + estradiol visam à redução nas concentrações de FSH e LH (Burke et al, 2005) e conseqüente atresia folicular (Rhodes et al, 2002) com início de nova onda folicular três a cinco dias após o tratamento (Vasconcelos et al, 1994;Bó et al, 1995), dependendo da dose (Burke et al, 2003) e do éster de estradiol utilizado (Martinez et al, 2005), e independentemente da fase de desenvolvimento em que a onda folicular se encontra (Burke et al, 2001). O grau de balanço energético negativo (BEN) em que o animal se encontra é um fator que pode influenciar o intervalo entre o tratamento com progesterona + estradiol e o início da nova onda folicular.…”

Section: Discussionunclassified

“…Essa dose, entretanto, pode ter tido maior efeito nas vacas com menor CC devido à maior sensibilidade do hipotálamo ao estradiol, o que poderia atrasar o início da nova onda. Rhodes et al (2002) observaram que parte das vacas em anestro apresentou atraso na emergência da onda folicular após tratamento com progesterona + estradiol e relacionaram esse efeito com a sensibilidade ao estradiol e à intensidade do anestro. Assim, em animais em anestro com menor CC, o estradiol aplicado no início do protocolo pode ter tido maior capacidade de causar feed-back negativo sobre a atividade secretória dos hormônios no eixo hipotálamo-hipofise, atrasando o início da nova onda folicular.…”

Section: Discussionunclassified

“…Estudos mostram que a condição nutricional pré e pós-parto influencia a duração do período de anestro (Richards et al, 1986;Ruas et al, 2005).…”

Section: Introductionunclassified

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Mês de parição, condição corporal e resposta ao protocolo de inseminação artificial em tempo fixo em vacas de corte primíparas

Meneghetti

Vasconcelos

2008

Arq. Bras. Med. Vet. Zootec.

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RESUMONo experimento I, foi avaliada a alteração da condição corporal (CC) pré e pós-parto em 155 novilhas inseminadas para parir de setembro a dezembro. A CC foi avaliada mensalmente no pré e pós-parto, de junho a fevereiro. No experimento II, 538 vacas primíparas foram sincronizadas com o protocolo de inseminação artificial em tempo fixo (IATF) que usou estradiol junto ao dispositivo intravaginal de progesterona (CIDR ® ). As taxas de ciclicidade, sincronização e concepção foram avaliadas por ultra-som. No experimento I, os animais que pariram primeiro tiveram maior (P<0,001) redução na CC pós-parto. No experimento II, foi observado maior CC (P<0,0001) nos animais com menor número de dias pós-parto, maior (P<0,05) taxa de sincronização nas vacas de melhor CC e aumento (P<0,0001) na taxa de concepção proporcional ao aumento na CC (incremento médio na concepção de seis pontos percentuais para cada 0,25 ponto na CC). Não se deve antecipar a parição de novilhas de corte quando se pretende realizar IATF no início da estação de monta subseqüente.Palavras-chave: gado de corte, primípara, condição corporal, inseminação artificial em tempo fixo atrasar a concepção e/ou levar ao descarte por falha reprodutiva. Estudos mostram que a condição nutricional pré e pós-parto influencia a duração do período de anestro (Richards et al., 1986;Ruas et al., 2005). ABSTRACT In experiment I, it was evaluated the body condition score (BCS) change during pre and post-partum in 155 heifers, inseminated to calve from September to December. The BCS was monthly evaluated from June to February, during the pre and post-partum periods. In experiment II, 538 primiparous cows were synchronized with a timed artificial insemination (TAI) protocol which used estradiol associated with an intravaginal progesterone device (CIDR ®)

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Section: Discussionunclassified

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Mês de parição, condição corporal e resposta ao protocolo de inseminação artificial em tempo fixo em vacas de corte primíparas

Meneghetti

Vasconcelos

2008

Arq. Bras. Med. Vet. Zootec.

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“…Emsen et al [17] obtained a fertility percentage of 45%, when administered a dose of 0.125 mg of MGA/ewe/day during 12 days; Castonguay et al [18] used a dose of 0.4 mg of MGA/ewe/day during 10 days and reported a fertility percentage of 45%. In both studies, the low fertility rate may be because: when low doses are administered, MGA (≤ 0.12 mg) generates a high frequency of luteinize hormone (LH) pulses, triggering the development of persistent follicles [19,20]; while when high doses are administered (≥ 0.4 mg), LH suppression can be so intense, which inhibits follicular development [21,22].…”

Section: Resultsmentioning

confidence: 99%

The Use of Melengestrol Acetate as a Strategy to Improve Production Efficiency of Sheep in Rural Areas in Mexico

Rojo-Martínez¹,

Salas-Razo²

2015

JAST-A

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Abstract:The aim of this study was to evaluate the use of melengestrol acetate (MGA) as a strategy to improve the production efficiency in ewes of rural areas in México. Twenty ewes of breeds (Dorper and Dorper with Pelibuey) non-pregnant and with ovarica activity were used. The treatment consisted of the administration of 0.22 mg MGA/ewe/d for 17 d. The MGA efficiency was measured once the treatment finalized, and the producer was responsible for the registration of the estrus presentation and prolificacy rate. 95% of the sheep presented estrus in a period of 14 d after stopping treatment. The prolificacy percentage was of 1.2 lambs born by ewe during a period of six months (including treatment and period of gestation). In conclusion, the use of MGA represents an alternative to improve the efficiency of sheep production in rural areas in México, since it can increase the number of lambs by 30% in a period of 12 months.

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“…As to the effectiveness of CIDR with PGF 2α treatment in both pre-pubertal and pubertal heifers was reported [10]. Regarding estrous synchronization, CIDR has been used on its alone for a short time, however, longer period of insertion resulted in impaired conception rate, particularly in lactating Holstein cow due to the persistent follicle by low concentration of progesterone [5,15,21]. Therefore, recently CIDR has been inserted for 7 days with combination of PGF 2α treatment at CIDR removal.…”

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confidence: 99%

Efficacy of Intravaginal Progesterone Administration as an Additional Treatment on Two Types of Timed AI Protocols in a Commercial Herd of Holstein Heifers

Iwakuma

Narahashi

Kitahara

et al. 2008

The Journal of Veterinary Medical Science

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ABSTRACT. Reproductive performance of two types of timed artificial insemination (TAI) protocols with or without intravaginal progesterone insert (CIDR) was investigated in a commercial herd of Holstein heifers. A total of seventy-four heifers with 14.4 months of age were allocated to two groups; Ovsynch (n=44) and estradiol benzoate (EB) used Heatsynch (EB-Heatsynch, n=30), and each group was additionally divided into two subgroups with CIDR insertion from day 0 to 7 (n=36) and without CIDR group (n=38). Blood was collected for progesterone (P 4 ) analysis and ovarian finding was monitored with ultrasonography. Heifers in CIDR-treated group resulted in higher pregnancy rate as compared to No-CIDR-treated group (63.9% vs 21.1%, P<0.01). Heifers with functional corpus luteum (CL) on day 0 resulted in significantly higher pregnancy rate in CIDR-treated group than No-CIDR-treated group (day 0: 67.9% vs 13.0%, P<0.01). CIDR insertion suppressed the intermediate ovulation during the first 7 days and the period from the second GnRH or EB administration to TAI as compared to No-CIDR-treated group (first 7 days: 33.3% vs. 52.6%; P<0.05, before TAI: 11.1% vs. 37.0%; P<0.05). In conclusion, the selected TAI protocols with CIDR provided acceptable pregnancy rate and contributed to the economical improvement by shortening the average age of first calving approximately for 2.5 months as compared to the previous management without TAI protocols.

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Effect of treatment with progesterone and oestradiol benzoate on ovarian follicular turnover in postpartum anoestrous cows and cows which have resumed oestrous cycles

Cited by 76 publications

References 27 publications

Mês de parição, condição corporal e resposta ao protocolo de inseminação artificial em tempo fixo em vacas de corte primíparas

Mês de parição, condição corporal e resposta ao protocolo de inseminação artificial em tempo fixo em vacas de corte primíparas

The Use of Melengestrol Acetate as a Strategy to Improve Production Efficiency of Sheep in Rural Areas in Mexico

Efficacy of Intravaginal Progesterone Administration as an Additional Treatment on Two Types of Timed AI Protocols in a Commercial Herd of Holstein Heifers

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