Fertilité, Prolificité Et Fécondité Pendant La Saison Sexuelle Des Brebis Inséminées Artificiellement Après Traitement a l'ACÉTATE De Fluorogestone

Colas, G.; Thimonier, J.; Courot, M.; Ortavant, R.; Cornu, C.; Guérin, Y.

doi:10.1051/animres:19730405

Cited by 26 publications

(7 citation statements)

References 1 publication

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“…The decrease in AI success with increasing female age is a very classical effect; our results agree with the 15% drop per year described a long time ago in the Lacaune breed by Colas et al (1973) and recently in a Spanish dairy breed by Anel et al (2005).…”

Section: Discussionsupporting

confidence: 92%

Environmental and genetic variation factors of artificial insemination success in French dairy sheep

David

Robert-Granié

Manfredi

et al. 2008

Animal

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Artificial inseminations (n 5 678 168) recorded during 5 years in five French artificial insemination (AI) centres (2 'Lacaune', 1 'Manech tê te rousse', 1 'Manech tê te noire' and 1 'Basco bé arnaise') were analysed to determine environmental and genetic factors affecting the insemination results. Analyses within centre-breed were performed using a linear model, which jointly estimates male and female fertility. This model combined four categories of data: the environmental effects related to the female, those related to the male, the non-sex-specific effects and finally the pedigree data of these males and females. After selection, the environmental female effects considered were age, synchronisation (0/1) on the previous year, total number of synchronisations during the female reproductive life, time interval between previous lambing and insemination, already dry or still lactating (0/1) when inseminated, and milk quantity produced during the previous year expressed as quartiles intra herd * year. The environmental male effects were motility and concentration of the semen. The non-sex-specific effects were the inseminator, the interaction herd * year nested within the inseminator, considered as random effects and the interaction year * season considered as a fixed effect. The main variation factors of AI success were relative to non-sex-specific effects and to female effects. Heritability estimates varied from 0.001 to 0.005 for male fertility and from 0.040 to 0.078 for female fertility. Repeatability estimates varied from 0.007 to 0.015 for male fertility and from 0.104 to 0.136 for female fertility. These parameters indicate that genetic improvement of AI results through a classical polygenic selection would be difficult. Moreover, in spite of the large quantity of variation factors fitted by the joint model, a very large residual variance remained unexplained.

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Section: Discussionsupporting

confidence: 92%

Environmental and genetic variation factors of artificial insemination success in French dairy sheep

David

Robert-Granié

Manfredi

et al. 2008

Animal

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“…La diminution de la fertilité observée chez la brebis, sous l'influence des progestagènes (54,5 % vs 72 %) (Colas et al, 1973) a été attribuée à des perturbations du transit du sperme (Quinlivan et Robinson, 1967Robinson, , 1969 Conley, 1971Conley, , 1972 Buisson, 1956), la période critique pour…”

Section: Discussionunclassified

“…Dans ces conditions, la fertilité est inférieure à celle observée après l'oestrus naturel (Colas et al, 1973 (Colas, 1975 Robinson, 1967Robinson, , 1969Hawk et Conley, 1971, 1972. L'un des facteurs contribuant au transit des spermatozoïdes est la motricité utérine (Mattner, 19631 Nous savons que l'activité rythmique spontanée de l'utérus chez la brebis au cours de l'oestrus est le résultat de l'action des cestrogènes (Rousseau et Prud'homme, 1974 (Smith et Robinson, 1970 Robinson, 1980) peut expliquer cette augmentation.…”

Section: Introductionunclassified

Activité électromyographique de l'utérus chez la brebis pendant la saison sexuelle : comparaison de l'œstrus naturel et de l'œstrus induit par les progestagènes seuls ou avec une supplémentation de PMSG

Prud'homme¹,

Pele²,

Lacroix³

et al. 1984

Reprod. Nutr. Dévelop.

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“…Only ejaculates with mass motility (MM) > 3, individual motility (IM) > 65% and concentration >3.0 × 10 9 /ml were approved and processed for use in AI. Semen was diluted using a milk‐based extender (Colas et al. 1973) to obtain 1.6 × 10 9 spz/ml and refrigerated to 15°C during 60 min in a refrigerated chamber.…”

Section: Methodsmentioning

confidence: 99%

Improvement of Fertility in Artificially Inseminated Ewes Following Vaginal Treatment with Misoprostol Plus Terbutaline Sulphate

Horta

Barbas

Marques

et al. 2010

Reprod Domestic Animals

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The effect of vaginal administration of misoprostol plus terbutaline sulphate 6 h prior to artificial insemination (AI) upon the site of AI (vaginal or cervical) and fertility was studied using a total of 87 estrous synchronized Serra da Estrela ewes (control n = 42 and treated n = 45). Artificial insemination was performed using refrigerated semen at 54-55 h after sponge removal. Lambing rate (fertility) and prolificacy were compared between control and treated ewes. The effect of the site of semen deposition on fertility was also evaluated. Prolificacy rate was not different between control (1.5) and treated (1.59) ewes. The proportion of cervical AI achieved in control (45.2%) and treated (37.8%) ewes was not significantly different. Overall, fertility was significantly lower in control than in treated ewes (42.9% vs 64.4%; p < 0.04). Fertility following vaginal AI was significantly lower for control for than treated ewes (30.4% vs 60.7%; p < 0.03) but the difference was smaller and not significant for cervical AI (control 57.9% vs 70.6%). It was concluded that vaginal administration of misoprostol plus terbutaline sulphate 6 h prior to artificial insemination did not affect the proportion of cervical inseminations but significantly improved the fertility of treated ewes. Although needing confirmation, it was hypothesized that drugs might have induced local secretory modifications leading to an increase of cervical ability to retain more viable spermatozoa for fertilization.

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Fertilité, Prolificité Et Fécondité Pendant La Saison Sexuelle Des Brebis Inséminées Artificiellement Après Traitement a l'ACÉTATE De Fluorogestone

Cited by 26 publications

References 1 publication

Environmental and genetic variation factors of artificial insemination success in French dairy sheep

Environmental and genetic variation factors of artificial insemination success in French dairy sheep

Activité électromyographique de l'utérus chez la brebis pendant la saison sexuelle : comparaison de l'œstrus naturel et de l'œstrus induit par les progestagènes seuls ou avec une supplémentation de PMSG

Improvement of Fertility in Artificially Inseminated Ewes Following Vaginal Treatment with Misoprostol Plus Terbutaline Sulphate

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