Variation between ejaculates in the fertility of frozen ram semen used for cervical insemination of merino ewes

Windsor, D.P.

doi:10.1016/s0378-4320(96)01635-1

Cited by 28 publications

(17 citation statements)

References 21 publications

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“…Such variations in the fertility of rams are well documented and have been reported after cervical inseminations with fresh semen (Salamon andRobinson 1962, Paulenz andothers 2002). Sire effects after the use of frozen semen have been described by Colas (1979) Windsor (1997) and Söderquist and others (1999) after cervical insemination, and by Maxwell (1986), others (1986, 1991) and Eppleston and Maxwell (1995) after laparoscopic insemination. The rams used as donors were selected after an estimation of their breeding value based on the results of natural matings in the previous season.…”

Section: Discussionmentioning

confidence: 90%

Effect of vaginal and cervical deposition of semen on the fertility of sheep inseminated with frozen‐thawed semen

Paulenz¹,

Söderquist

Ådnøy

et al. 2005

Veterinary Record

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The effect of vaginal and cervical deposition of frozen-thawed semen on the fertility of sheep was tested in a field trial in which 543 Norwegian crossbred ewes aged between six months and five-and-a-half years from 10 farms were inseminated after natural oestrus. Cervical insemination with 200 x 10(6) spermatozoa resulted in 25-day non-return and lambing rates of 75.4 and 72.7 per cent, respectively, and vaginal insemination gave rates of 71.3 and 67.4 per cent; the cervical inseminations produced significantly higher lambing rates (P=0.04). There were significant differences between the lambing rates for different rams (P=0.006) and different farmers (P=0.003), and there was a significant interaction between farmer and deposition site (P=0.03). After vaginal insemination fertility was encouragingly high, but the results varied with the farmer, and different flock and management conditions.

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Section: Discussionmentioning

confidence: 90%

Effect of vaginal and cervical deposition of semen on the fertility of sheep inseminated with frozen‐thawed semen

Paulenz¹,

Söderquist

Ådnøy

et al. 2005

Veterinary Record

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“…As baixas taxas de prenhez obtidas com a IAC neste estudo (13,3-15,8%) estão de acordo com os resultados de Windsor (1997), que trabalhando com ovelhas da raça Merino, inseminadas com sêmen congelado oriundo de diferentes doadores, obtiveram fertilidade entre 1,8% e 11,9%. A variação desses achados, superiores ou inferiores às taxas obtidas no presente estudo, pode ser devida, entre outros fatores, ao local de deposição ou à qualidade do sêmen utilizado.…”

Section: Resultsunclassified

Avaliação econômica de diferentes técnicas de inseminação artificial em ovinos da raça Santa Inês

Cardoso

Cruz

Ferraz

et al. 2009

Agraria

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Objetivou-se determinar o custo do cordeiro produzido por meio de diferentes técnicas de inseminação artificial (IA) em ovinos da raça Santa Inês. O experimento foi conduzido em um arranjo fatorial 3x2, em delineamento em blocos casualizados. Cento e duas fêmeas foram divididas em três grupos: IA via cervical com sêmen fresco (IAF); IA via cervical com sêmen congelado (IAC); e IA por laparoscopia com sêmen congelado (IAL). Na determinação do custo total do cordeiro produzido foram considerados os custos fixos e variáveis. Os custos de mão-de-obra apresentaram variação entre as técnicas, sendo 9,4% na IAC, 17,7% na IAF e 26,4% na IAL sobre o custo total. Os dispêndios com o tratamento hormonal foram superiores, quando comparados aos demais componentes, sendo 65,8; 54,0 e 28,7% para IAF, IAC e IAL, respectivamente. O custo total do cordeiro variou em função da técnica de inseminação artificial utilizada, sendo que na IAF o custo foi 4,4 vezes menor que a IAC e 2,2 vezes menor que a IAL. A IAF apresenta custo por cordeiro produzido mais baixo que as demais técnicas. A IAC, devido às baixas taxas de fertilidade proporcionadas, mostra-se economicamente inviável, enquanto que a IA por laparoscopia, apesar das taxas de fertilidade satisfatórias, contribui para elevação do custo do cordeiro produzido.Palavras-chave: análise econômica, custo do cordeiro, ovelha, reprodução Economic evaluation of different techniques of artificial insemination in Santa Inês sheep AB S TR ACTThis study aimed to determine the cost of lamb produced from different artificial insemination techniques in Santa Inês sheep. The experiment was conducted on a 3 x 2 factorial arrangement, on a randomized block design. One hundred and two females were divided in three groups: cervical artificial insemination with fresh semen -AI or frozen-thawed semen -AIFT or laparoscopic artificial insemination -LAI. On the determination of the total cost of the produced lamb, variable and fixed costs were considered. The costs from the labor suffered a great technical variation among the techniques as 9.4% in IAC, 17.7% in IAF e 26.4% in IAL. The expenses with hormonal treatment were higher when compared to other components corresponding to 65.8, 54.0 and 28.7% to IAF, AIFT and LAI, respectively. The total cost of the lamb changed according to the artificial insemination technique used, as the IAF cost was 4.4 times lower than IAC cost and 2.2 times lower than IAL cost. The IAF presents lower cost per produced lamb when compared to the other techniques. The IAC, due to low fertility rates achieved, was economically unfeasible, while the IA by laparoscopy, in spite of the satisfactory fertility rate, contributes to increase the cost of lamb produced.

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“…There is also the problem that changes to the freezing protocol that enhance post-thaw motility do not necessarily translate into improved lambing rates (Sanchez-Partida et al, 1999). Variation in fertility between rams and between ejaculates within rams (Windsor, 1997) adds to the complexity. Even an evaluation of semen quality based on in vitro fertilisation proved ineffective in predicting pregnancy rates following cervical insemination with frozen-thawed semen (Papadopoulos et al, 2005), although a reduction in sperm concentration from 2 3 10 6 to 0.0625 3 10 6 per ml resulted in a significant correlation (P 5 0.013) between fertility in vivo and fertility in vitro.…”

Section: Recent Studies In Semen Freezingmentioning

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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Variation between ejaculates in the fertility of frozen ram semen used for cervical insemination of merino ewes

Cited by 28 publications

References 21 publications

Effect of vaginal and cervical deposition of semen on the fertility of sheep inseminated with frozen‐thawed semen

Effect of vaginal and cervical deposition of semen on the fertility of sheep inseminated with frozen‐thawed semen

Avaliação econômica de diferentes técnicas de inseminação artificial em ovinos da raça Santa Inês

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

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