Fertility of superovulated ewes following intrauterine or oviducal insemination with fresh or frozen-thawed semen

Jabbour, HN; Evans, G.

doi:10.1071/rd9910001

Cited by 23 publications

(8 citation statements)

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“…2003; Garcia‐Macias et al. 2005) or any problematic semen dose could be applied with high fertility guaranties when deep intrauterine or oviductal sperm deposition are used (Jabbour and Evans 1991). Also, the use of sexed semen could be included in this methodology because sorting and processing these samples affects sperm freezability (labile sperm populations).…”

Section: Artificial Insemination Proceduresmentioning

confidence: 99%

“…The incorporation of new technologies in assisted reproduction in ram species is a reduced field but more adequate for laparoscopy insemination. Thus, poor quality sperm samples (from high genetic value animals), epididymal sperm Garcia-Macias et al 2005) or any problematic semen dose could be applied with high fertility guaranties when deep intrauterine or oviductal sperm deposition are used (Jabbour and Evans 1991). Also, the use of sexed semen could be included in this methodology because sorting and processing these samples affects sperm freezability (labile sperm populations).…”

Section: Intrauterine Depositionmentioning

confidence: 99%

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Improvement Strategies in Ovine Artificial Insemination

Anel

Álvarez

Martínez‐Pastor

et al. 2006

Reprod Domestic Animals

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Artificial insemination in ram is scarcely widespread comparing with other domestic species. This has been due not only to fertility results being irregular and low but also because of the difficulty in the application of enhancements such as the use of frozen-thawed sperm. Although there is a lot of information on the use of different options to improve these AI results (such as transcervical application, the use of thawed sperm, etc.) commercial programmes can be classified on two general categories: those using refrigerated semen (15 degrees C) by superficial intracervical deposition (vaginal), and, more restricted, those using thawed sperm by intrauterine deposition (laparoscopy). In the present work, we have summarized our viewpoint on three general research lines for the improvement of AI results in sheep: semen preservation, AI procedures and semen assessment. Briefly, in ram it is necessary to develop a medium term methodology of sperm refrigeration (3-5 days), which would allow the distribution of sperm doses to a widespread area. Nevertheless, it is also necessary to develop an intrauterine transcervical AI technique, which allows thawed semen to be applied by vaginal insemination. Besides, the low predictive value of classic assessment techniques limits the ability to adjust the number of spermatozoa per dose according to its actual fertility.

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Section: Artificial Insemination Proceduresmentioning

confidence: 99%

Section: Intrauterine Depositionmentioning

confidence: 99%

Improvement Strategies in Ovine Artificial Insemination

Anel

Álvarez

Martínez‐Pastor

et al. 2006

Reprod Domestic Animals

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“…2003) have been described with these mistimed ovulations causing subsequent fertilization failures, due to the presence of aged oocytes (Takahashi et al. 2003) and/or aged spermatozoa (Jabbour and Evans 1991) at the time of fertilization.…”

Section: Introductionmentioning

confidence: 99%

Timing of Preovulatory LH Surge and Ovulation in Superovulated Sheep are Affected by Follicular Status at Start of the FSH Treatment

Veiga-López¹,

Encinas²,

McNeilly³

et al. 2007

Reprod Domestic Animals

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The aims of this study were to evaluate the chronology of periovulatory events (oestrus behaviour, LH surge and ovulation) in 16 superovulated Manchega sheep and to determine whether follicular status at start of the FSH supply might affect their occurrence. Mean timing for onset of oestrus behaviour was detected at 28.1 +/- 0.7 h after sponge withdrawal; the preovulatory LH surge and ovulation started at 37.2 +/- 0.7 h and 65.4 +/- 0.7 h after progestagen withdrawal, respectively. The intervals between oestrus, LH surge and ovulation were affected by a high individual variability, which might be the cause for reported decreased efficiency in embryo production. Current results also addressed the role of follicular status at start of the superovulatory treatment on the preovulatory LH surge and the ovulation. The interval LH surge-ovulation was increased in ewes with a growing dominant follicle at starting the FSH treatment (32.3 +/- 0.9 vs 28.6 +/- 0.5 h, p < 0.05). The developmental stage of the largest follicle at starting the superovulatory treatment also affected occurrence of LH surge and ovulation; follicles in growing phase advanced the occurrence of the LH surge and ovulation when compared to decreasing follicles (33.0 +/- 1.0 vs 43.5 +/- 1.1 h, p < 0.05, for LH peak and 60.7 +/- 1.1 vs 72.8 +/- 1.2 h, p < 0.05, for ovulation). Thus, only ewes with growing follicles ovulated prior to 55 h after sponge withdrawal; conversely, no sheep with decreasing follicles ovulated earlier than 67 h, when an 85.7% of the ewes bearing growing follicles has ovulated at 63 h.

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“…The lack of synchronization between the time of ovulation and the application of AI was suggested as the most common cause of AI failure (Jabbour and Evans, 1991). Time of ovulation depends on protocol applied for oestrus synchronization, breed, animal, age, flock and season of the year (Evans, 1988;Walker et al, 1989).…”

Section: Discussionmentioning

confidence: 99%

Fertility rate of short-term progestagen pretreated ewes in relation to breed: A field study

Papadopoulos

Deligiannis

Theodosiadou

et al. 2018

J Hellenic Vet Med Soc

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The effect of short-term instead of long-term progestagen treatment on fertility of Karagouniko and Chios ewes, after natural mating or artificial insemination, was investigated. Two experiments were performed during the transition period from anοestrous to the breeding season. In the 1st experiment (natural mating, NM), Karagouniko and Chios ewes were randomly allocated into 3 groups, that were KLM (long-term progestagen treatment; n=35), KSM (short-term progestagen treatment; n=34), KSP (short-term progestagen treatment; prostaglandin; n=35) and CLM (n=40), CSM (n=35), CSP (n=38), respectively. In the 2nd experiment (intracervical artificial insemination, AI) Karagouniko and Chios ewes were randomly allocated into 3 groups, that were KLA (long-term progestagen treatment; AI at 54h; n=50), KSA1 (short-term progestagen treatment; AI at 54h; n=20), KSA2 (short-term progestagen treatment; AI at 48h; n=28) and CLA (n=40), CSA1 (n=16), CSA2 (n=20), respectively. At sponges’ removal (d0) all ewes received 400 IU eCG. Ten rams served NM, while for AI fresh diluted semen was used. Pregnancy diagnosis was performed, 45-50 days later. Ιn the 1st experiment, blood samples were collected, daily for 5 days, starting on d0, for serum progesterone assessment. Conception rate in Karagouniko ewes after NM was higher (P<0.05) in KSM (35.29%) compared to KLM (17.14%) group, but did not differ with KSP (28.57%) group, while after AI it was higher (P<0.05) in KLA (42.00%) or KSA1 (40.00%) compared to KSA2 (14.29%) group. In Chios ewes no significant differences were observed between groups either after NM [CLM (45.00%), CSM (36.84%), CSP (34.29%)] or after AI [CSA1 (50.00%), CSA2 (50.00%), CLA (45.00%)]. No significant differences were observed after NM or after AI in the litter size in both breeds. These results indicate that short-term progestagen treatment for oestrus synchronization could be applied in indigenous Greek sheep breeds, resulting in equal (Chios) or improved fertility (Karagouniko) than the common long-term one. Also, the fertility rate in ewes subjected to short-term progestagen treatment depends on the time of AI in relation to breed.

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Fertility of superovulated ewes following intrauterine or oviducal insemination with fresh or frozen-thawed semen

Cited by 23 publications

References 0 publications

Improvement Strategies in Ovine Artificial Insemination

Improvement Strategies in Ovine Artificial Insemination

Timing of Preovulatory LH Surge and Ovulation in Superovulated Sheep are Affected by Follicular Status at Start of the FSH Treatment

Fertility rate of short-term progestagen pretreated ewes in relation to breed: A field study

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