Influence of breed and age on morphometry and depth of inseminating catheter penetration in the ewe cervix: A postmortem study

Kaabi, M.; Álvarez, M.; Anel, E.; Chamorro, C.A.; Boixo, J.C.; Paz, P. de; Anel, L.

doi:10.1016/j.theriogenology.2006.04.039

Cited by 66 publications

(64 citation statements)

References 22 publications

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“…Fertility rate is higher when semen is placed deeper in the cervix during cervical insemination [3] [65]. Spanish sheep breeds with low fertility rate (Assaf and Churra) present a more complex cervical canal, which impairs deep penetration [65].…”

Section: Semen Deposition Placementioning

confidence: 99%

“…Spanish sheep breeds with low fertility rate (Assaf and Churra) present a more complex cervical canal, which impairs deep penetration [65]. Cervix distress or trauma may condition fertility rate by affecting semen transport and viability in the female genital tract, originated by an influx of immune cells to the cervical canal [7] [13] [66].…”

Section: Semen Deposition Placementioning

confidence: 99%

See 1 more Smart Citation

Estrus Synchronization and Artificial Insemination with Fresh and Chilled Semen in Assaf Ewes

Fornazari¹,

Mateus²,

Correia³

et al. 2018

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This paper aims to study the efficiency of two short-term progestagen (FGA vs. MAP) + eCG treatments in estrus synchronization and artificial insemination (AI) with fresh or chilled semen in Assaf ewes fertility rate. All ewes received a subcutaneous implant of exogenous melatonin 45 days before been treated with short-term progestagens + eCG. By June 1 st , ewes were divided in two groups: half was treated with an intravaginal sponge impregnated with 20 mg of FGA and the other half with an intravaginal sponge impregnated with 60 mg of MAP. Progestagen treatments lasted for 6 days. At sponge withdraw, all ewes were injected with 750 IU of eCG. Ovarian activity was assessed by plasmatic progesterone levels before and after progestagens + eCG treatment. Semen was collected by electro ejaculation and extended with Andromed ® or OviXcell ® . AI was performed 55 hours after eCG administration with fresh or chilled semen. During AI several factors were assessed: vagina mucosa color and lubrication, external cervical Os type, cervical mucous viscosity, semen deposition place and seminal cervix outflow. Semen was deposited as deep as possible without distress or trauma cervix mucosa. All Assaf ewes presented cyclic activity before progestagen + eCG treatments (2 nd fortnight of May).Short-term progestagen + eCG treatments were equally efficient (100.0%). About 76.5% of Assaf ewes were pregnant 41 days after AI. Fertility rate was influenced by external Os type, semen deposition place and seminal cervix outflow. However, this rate was not conditioned by vaginal color or lubrication, cervical mucus viscosity, semen preservation technic and semen extender.

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Section: Semen Deposition Placementioning

confidence: 99%

Section: Semen Deposition Placementioning

confidence: 99%

Estrus Synchronization and Artificial Insemination with Fresh and Chilled Semen in Assaf Ewes

Fornazari¹,

Mateus²,

Correia³

et al. 2018

View full text Add to dashboard Cite

show abstract

“…In a post-mortem study involving 365 cervices from four breeds (Churra, Assaf, Merino and Castellana), Kaabi et al (2006) reported both age and breed effects on the morphology of the cervix, which were linked to the degree of cervical penetration. The Churra, a milk breed, had shorter narrower cervices with more folds or rings than the other breeds making its cervix most difficult to penetrate.…”

Section: Transcervical Inseminationmentioning

confidence: 99%

Traversing the ovine cervix – a challenge for cryopreserved semen and creative science

Robinson

McKelvey²,

King

et al. 2011

Animal

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This review brings together research findings on cervical relaxation in the ewe and its pharmacological stimulation for enhancement of the penetration needed for transcervical insemination and embryo transfer. On the basis that the success of artificial insemination is the percentage of ewes lambing, a review is made of recent research aimed at understanding and minimising the sub-lethal effects of freezing and thawing on the viability of spermatozoa, their membrane integrity and their ability to migrate through cervical mucus, as these characteristics have a major influence on fertility, particularly when semen is deposited, artificially, in the os cervix. Milestones of achievement are given for transcervical intrauterine insemination, embryo recovery and transfer and the birth of lambs of pre-determined sex, firstly following intracytoplasmic sperm injection, then laparoscopic intrauterine insemination using highly diluted flow-cytometrically sorted fresh semen and subsequently by os cervix insemination using sexed semen that had been frozen and thawed. Diversity of research endeavour (applied, cellular, molecular), research discipline (anatomy, histology, immunology, endocrinology) and research focus (cell, tissue, organ, whole animal) is embraced within the review as each has significant contributions to make in advancing recent scientific findings from the laboratory into robust on-farm transcervical insemination and embryo transfer techniques.Keywords: ovine cervix, semen cryopreservation, artificial insemination, embryo recovery and transfer ImplicationsIn bringing together the results of recent research on the cryopreservation of ram semen and the relaxation of the ewe cervix, this review provides a basis for identifying opportunities for improving the efficiency of cervical insemination and transcervical embryo recovery and transfer in sheep genetic improvement programmes.

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“…Alternatively, variation may be due to differences in the morphometric characteristics of the cervix (Eppleston, et al, 1994). In this sense, Kaabi et al (2006), carried out a morphometric study in four ovine breeds (Assaf, Churra, Castellana and Merino) showing important differences in length, width, number of folds and distance between folds, which originates breed variations in the depth of catheter penetration into the cervix during AI. In this study, the breeds yielding lower fertility after AI resulted in higher cervical complexity, and achieved a lesser degree of cervical penetration of the catheter during cervical AI.…”

Section: Breedmentioning

confidence: 99%

Management Factors Affecting Fertility in Sheep

Santolaria¹,

Palacín²,

Yániz³

2011

Artificial Insemination in Farm Animals

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Influence of breed and age on morphometry and depth of inseminating catheter penetration in the ewe cervix: A postmortem study

Cited by 66 publications

References 22 publications

Estrus Synchronization and Artificial Insemination with Fresh and Chilled Semen in Assaf Ewes

Estrus Synchronization and Artificial Insemination with Fresh and Chilled Semen in Assaf Ewes

Traversing the ovine cervix – a challenge for cryopreserved semen and creative science

Management Factors Affecting Fertility in Sheep

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