Reproductive response of mature and nulliparous yearling ewes to the ram effect during the non-breeding season

Ungerfeld, Rodolfo

doi:10.1016/j.smallrumres.2016.05.017

Cited by 10 publications

(4 citation statements)

References 23 publications

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“…Rams similarly interest both of them and similar pregnancy rate can be obtained (Ungerfeld and Rubianes, 1999;Ungerfeld, 2016). Our results have corroborated the previous studies revealing similar fertility after comparison of short-term and long-term synchronization protocol in ewes.…”

Section: Discussionsupporting

confidence: 90%

Comparison of Pregnancy Rates after Short - Term and Long -Term Synchronization Protocol in Ewes- Pilot Study

Güner

Saat

2021

Erciyes Üniversitesi Veteriner Fakültesi Dergisi

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The objective of the study was to compare the pregnancy rates after short-term and long-term synchronization protocol in Kivircik ewes. Ewes (n=54) were randomly divided into two synchronization groups as ST (short-term; n=27) or LT (long-term, n=27). Intravaginal sponge was inserted on the same day (D0) in both groups. It was removed at 7 days (D7) in the ST group and 13 days (D13) in the LT group. All ewes received 450 IU eCG and 75 µg dcloprostenol at the time of sponge removal. The characteristics of vaginal discharge were evaluated following sponge withdrawal. For both protocols, 5 fertile rams per 27 ewes were used for natural mating following sponge removal. The overall estrous response and pregnancy rate were 88.9% and 64.8%, respectively. Following the synchronization, the overall estrous response (94.7% vs. 85.7%, respectively) and pregnancy rate (63.1% vs. 65.7%, respectively) were similar in both multiparous and nulliparous ewes. Although the short-term protocol reduced the rate of severe vaginitis from 48.1% to 25.9%, pregnancy rates were not different in both synchronization protocols. Nulliparous ewes had a higher rate (48.6% vs. 15.8%) of severe vaginal discharge than multiparous ewes. However, the alteration of the vaginal discharge severity depending on parity did not affect the overall pregnancy rate after the short-term (66.7%) and long-term (63.0%) protocols. Therefore, the long-term and short-term protocol can be used in both nulliparous and multiparous ewes in small flocks.

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Section: Discussionsupporting

confidence: 90%

Comparison of Pregnancy Rates after Short - Term and Long -Term Synchronization Protocol in Ewes- Pilot Study

Güner

Saat

2021

Erciyes Üniversitesi Veteriner Fakültesi Dergisi

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“…The outcomes of our study revealed a notable disparity from previous findings, indicating a higher pregnancy rate in nulliparous than parous ewes. This contrast with previous reports in ewes (Ungerfeld, 2016) and goats (Carrillo et al, 2007;Véliz et al, 2002Véliz et al, , 2006, which suggested a higher pregnancy rate in parous than nulliparous ewes. A likely explanation of this discrepancy lies in the greater number of nulliparous ewes within the optimal BCS (2.5-3; 69%) compared to multiparous ewes (3.5 or more; 55%) in our study.…”

Section: Discussioncontrasting

confidence: 99%

Factors influencing pregnancy rate and loss after laparoscopic artificial insemination with frozen–thawed semen in Lohi sheep under sub‐tropical conditions

Khan,

Ahmad,

Husnain

et al. 2024

Reprod Domestic Animals

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This study evaluates factors influencing pregnancy rates per artificial insemination (P/AI) and pregnancy loss in Lohi ewes undergoing laparoscopic AI with frozen–thawed semen under sub‐tropical conditions. Data from three experiments comprising ewes (n = 358) of mixed parity (nulliparous; NP and parous; P), various body condition score (BCS) and assigned to long‐term (LTP, 11 days) and short‐term (STP, 5 days) oestrus synchronization regimen across high breeding season (HBS) and low breeding season (LBS) were analysed. Laparoscopic insemination was conducted 54 h post‐sponge removal. Pregnancy diagnosis and loss were evaluated on days 35 and 90 post‐insemination via ultrasonography. Results showed parity significantly influenced P/AI, with nulliparous ewes achieving higher pregnancy ratios than parous ewes (p = .001). BCS significantly influenced P/AI (p < .05), with a quadratic relationship observed between BCS and season (BCS*BCS*Season; p = .07). Progestin treatment did not significantly influence the ratio of pregnant ewes (p = .07). Pregnancy losses were significantly higher during LBS than HBS (p < .05), irrespective of progestin treatment. In conclusion, parity and BCS significantly influenced P/AI, with BCS demonstrating a quadratic association with season. Ewes bred during LBS experienced higher pregnancy losses than HBS, irrespective of progestin treatment.

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“…However, it has recently been suggested that the novelty of the introduced ram/buck is more important, and so there will be an effect even if the ewes/does have been in continuous contact with a male (Rosa and Bryant 2002, Delgadillo and others 2009). The impact of the ‘male effect’ is greater for multiparous than nulliparous ewes (Ungerfeld 2016).…”

Section: Use Of Teasers In Small Ruminant Productionmentioning

confidence: 99%

Such a tease! Production and uses of teaser rams, bucks, boars and bulls

Crilly¹,

Wood²,

Reilly³

2022

In Practice

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Background: Male livestock rendered sterile through vasectomy or epididymectomy, but still hormonally and behaviourally sexually active, have many uses. In small ruminants they can be used to advance the breeding season and puberty, synchronise and detect oestrus and improve conception rates to artificial insemination. In pigs, they can be used to hasten first oestrus in gilts and detect oestrus in sows. In cattle, they can be used to aid heat detection for artificial insemination.Aim of the article: This article outlines the surgical techniques used to produce such ‘teaser’ animals and discusses how they can be best used, as well as the alternatives to their use.

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Reproductive response of mature and nulliparous yearling ewes to the ram effect during the non-breeding season

Cited by 10 publications

References 23 publications

Comparison of Pregnancy Rates after Short - Term and Long -Term Synchronization Protocol in Ewes- Pilot Study

Comparison of Pregnancy Rates after Short - Term and Long -Term Synchronization Protocol in Ewes- Pilot Study

Factors influencing pregnancy rate and loss after laparoscopic artificial insemination with frozen–thawed semen in Lohi sheep under sub‐tropical conditions

Such a tease! Production and uses of teaser rams, bucks, boars and bulls

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