Effect of time of artificial insemination on fertility of progestagen and PMSG treated indigenous Greek ewes, during non-breeding season

Karagiannidis, A.; Varsakeli, S.; Karatzas, Gabriel; Brozos, Christos

doi:10.1016/s0921-4488(00)00170-x

Cited by 20 publications

(17 citation statements)

References 32 publications

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“…The breed of ewe has a significant effect on the pregnancy rate, which is consistent with the results of Hill et al (1998), Perkins et al (1996), Donovan et al (2001 and, Karagiannidis et al (2001) and Anel et al (2005). However, the results could be positively modified by the interest of the sheep owner.…”

supporting

confidence: 86%

“…According to Hill et al (1998), the wool type (strong wool -67.6%; fine wool -71.7%; fine medium and medium 73%) of Australian Merino affected the average pregnancy rate. In a Greek study (Karagiannidis et al, 2001), the conception rate rank of ewes was Chios, Vlachiki and (Vlachiki x Chios), with a significant difference between them. The pregnancy rate of Suffolk ewes was much lower (12%) than that of Finnish landrace (65%) in Irish studies (Donovan et al, 2001 and, while the breed of the ram also had a significant effect on prolificacy after AI (Perkins et al, 1996;Donovan et al, 2001 andAnel et al, 2005).…”

Section: The Breedmentioning

confidence: 96%

“…The best time of insemination could be 46 (Fernandez-Abella et al, 2003), 48 to 72 (Karagiannidis et al, 2001), and 58 to 63 (Donovan et al, 2001(Donovan et al, , 2004 hours after the pessary removal. Hill et al (1998) reported that the type and dosage of PMSG (Pregnant Mare Serum Globulin -200 IU -62.4%; 250 IU -72.9%; 300 IU -79.1%; 375 IU and above -69.4%) had a significant effect on the conception rate in artificial insemination.…”

Section: Time Of Insemination After Oestrus Synchronisationmentioning

confidence: 99%

See 2 more Smart Citations

Artificial Insemination of Sheep - Possibilities, Realities and Techniques at the Farm Level

Kukovics¹,

Gyoker²,

Németh³

et al. 2011

Artificial Insemination in Farm Animals

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supporting

confidence: 86%

Section: The Breedmentioning

confidence: 96%

Section: Time Of Insemination After Oestrus Synchronisationmentioning

confidence: 99%

See 1 more Smart Citation

Artificial Insemination of Sheep - Possibilities, Realities and Techniques at the Farm Level

Kukovics¹,

Gyoker²,

Németh³

et al. 2011

Artificial Insemination in Farm Animals

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“…More recently, an experiment in fat-tailed ewes inseminated during late breeding season either once (at 54-56 h) or twice (repeated at 6-8 h) (Emsen et al, 2008) reported that double insemination did favor lambing rate and prolificacy, questioning if either the higher dose of spermatozoa or the repeated insemination accounted for such differences. Karagiannidis et al (2001) concluded that the best time for double FTAI depended on the breed, being at 48 and 72 h for Chios and Chios x Vlachiki breeds, but at 48 and 60 h for Vlachiki.…”

Section: Resultsmentioning

confidence: 99%

Fixed-Time Artificial Insemination in dairy ewes raised in field conditions in Argentina

Simonetti

Maria

Mercedes

2014

AVB

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-Modern systems of sheep production are directed towards intensification, being in this line the adoption of artificial insemination. The objective was to compare two protocols of fixed-time artificial insemination (FTAI) in dairy ewes managed under field conditions in Buenos Aires province, Argentina. Twenty four two-tooth Milchschaf x Texel ewes, aging 18 months, were synchronized with intravaginal sponges plus 300 IU eCG and cervically inseminated with fresh semen either once at 54 h (Group A) or twice at 48 and 60 h (Group B) after sponge removal. Additionally, a second experiment was performed to detect the estrus onset; thus, 23 Milchschaf x Texel ewes were synchronized as previously described and estrus was detected at 6-h intervals by teaser rams. The pregnancy rate was higher in B than in A (B: 50.0% vs. A: 9.1%; P < 0.05). In the group exposed to teasers, 91.3% of the ewes came into estrus from 24 to 36 h after sponge removal, with an interval to estrus averaging 30.6  1.0 h. Based on both type of mucus mostly observed and data of estrus outcome, it could be suggested that the difference in effectiveness between protocols would be related to an earlier rather than to a double insemination. In conclusion, this study provides information on the application of FTAI in dairy ewes reared rangeland in Argentina.Keywords: Sheep, reproduction, AI, FTAI, synchronization.RESUMO -Sistemas modernos de produção de ovinos são direcionados para a intensificação, sendo nesta linha a adoção da inseminação artificial. O objetivo foi comparar dois protocolos de inseminação artificial em tempo fixo (IATF) em ovelhas leiteiras criadas em condições de campo na provincia de Buenos Aires, Argentina. Vinte e quatro ovelhas Milchschaf x Texel com "pinças permanentes", de 18 meses de idade, foram sincronizadas com esponjas intravaginais e 300 UI de eCG e inseminadas por via cervical com sêmen fresco. As IATF foram realizadas uma vez às 54 h (Grupo A) ou duas vezes às 48 e 60 h (Grupo B) após a retirada da esponja. Foi realizado um segundo experimento com 23 ovelhas Milchschaf x Texel, as quais foram sincronizadas como descrito anteriormente e seus estros foram detectados em intervalos de 6 h por rufiões. A taxa de prenhez foi maior em B do que em A (B: 50,0% vs A: 9,1%; P < 0,05). No grupo exposto a rufiões, 91,3% das ovelhas entraram em estro 24-36 h após a retirada da esponja, com um intervalo médio ao estro de 30,61,0 h. Com base no tipo de muco mais freqüentemente observado e nos resultados da apresentação de estro, pode ser sugerido que a diferença na eficácia entre protocolos estaria mais relacionada com a precocidade do estro em relação aos tempos pré-estabelecidos para as inseminações do que propriamente o número de inseminações. Em conclusão, este estudo oferece informação sobre a aplicação da IATF em ovelhas leiteiras criadas nas pastagens da Argentina.Palavras-Chave: Ovinos, reprodução, IA, IATF, sincronização.

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“…O tempo de receptividade foi significativamente maior (p>0,05) nas fêmeas do T1 e T3, apresentando médias (± desvio padrão) de 40,5±6,49 h e 53,68±10,27 h respectivamente, compa-rado às fêmeas do T2, 34,56±7,2 h. Acreditase que tal fato, possa estar correlacionado a maior concentração dos momentos de ovulação das fêmeas do grupo T2, corroborando para sua melhor taxa de prenhez. As médias da duração do estro não diferiram entre os tratamentos (p>0,05), demonstrando no T1, 47,64 h, semelhante às observações de Karagiannidis et al (2001 …”

Section: Resultsunclassified

Eficiência do protocolo ovsynch em ovelhas da raça Santa Inês

et al. 2009

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Effect of time of artificial insemination on fertility of progestagen and PMSG treated indigenous Greek ewes, during non-breeding season

Cited by 20 publications

References 32 publications

Artificial Insemination of Sheep - Possibilities, Realities and Techniques at the Farm Level

Artificial Insemination of Sheep - Possibilities, Realities and Techniques at the Farm Level

Fixed-Time Artificial Insemination in dairy ewes raised in field conditions in Argentina

Eficiência do protocolo ovsynch em ovelhas da raça Santa Inês

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