I.N.R.A. research on the Romanov sheep breed in France: A review

Ricordeau, G.; Thimonier, J.; Poivey, Jean Paul J. P.; Driancourt, Marc Antoine; Hochereau‐De‐Reviers, M.T.; Tchamitchian, L.

doi:10.1016/0301-6226(90)90009-u

Cited by 48 publications

(25 citation statements)

References 37 publications

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Section: Re Sultscontrasting

confidence: 60%

“…Indeed, the high LS, the high repeatability of ovulation rate and LS observed in D'man ewes (and F1 crosses) were possible indicators of the segregation of a prolificacy major gene. However, these and other estimates were not clearly different from Romanov and its crosses in which the inheritance pattern of LS is polygenic (Boujenane et al, ; Bradford et al, ; Ricordeau et al, ). The difficulties experienced in the previous studies to conclude or not for the presence of a prolificacy major gene in the D'man breed may be due to the relatively high frequency of the FecL L prolific allele with 80%–90% of carrier animals.…”

Section: Discussionmentioning

confidence: 60%

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The high prolificacy of D’man sheep is associated with the segregation of the FecL^L mutation in the B4GALNT2 gene

Jemaa

Ruesche

Sarry

et al. 2019

Reprod Domestic Animals

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Contents Mutations in the FecL locus are associated with large variation in ovulation rate and litter size in the French Lacaune sheep breed. It has been shown that the B4GALNT2 gene within the FecL locus is most likely responsible for the high fecundity in the French breed. In this study, we have highlighted the segregation of the FecLL mutation within the B4GALNT2 gene in North African sheep breeds and notably in the highly prolific D'man breed. Genotyping of a sample of 183 Tunisian D'man individuals revealed a high frequency (0.65) of the prolific allele FecLLwhich was attributed to the adoption of a decades‐old breeding strategy based on the selection of ewe lambs born from large litter size. Homozygous LL ewes showed a significantly increased litter size compared to heterozygous and non‐carrier ewes (FecLL/FecLL = 2.47 ± 0.09 vs. FecLL/FecL+ = 2.23 ± 0.09, p < 0.05 and FecL+/FecL+ = 1.93 ± 0.18, p < 0.01). The presence of the FecLLpolymorphism in both D'man and Lacaune breeds argues for an ancestral origin of this mutation and brings an answer to the old question of the genetic determinism of the extreme prolificacy of the D'man ewes. The results of this study can help to establish planned genotype‐based mating allowing both higher profit for the breeders and an optimal management of the FecLL mutation in D'man sheep populations.

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Section: Re Sultscontrasting

confidence: 60%

Section: Discussionmentioning

confidence: 60%

The high prolificacy of D’man sheep is associated with the segregation of the FecL^L mutation in the B4GALNT2 gene

Jemaa

Ruesche

Sarry

et al. 2019

Reprod Domestic Animals

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“…However, results of this study showed that prolific ewes (Romanov × Pelibuey) presented longer interval to estrus after device removal and a more disperse estrus distribution. There was expected a shorter interval to estrus and the estrus distribution more compacted 24 h post sponge removal for Romanov × Pelibuey ewes, because Romanov breed has naturally higher follicular development, secretion of estrogen, ovulation rate, and prolificacy, and three times more granulosa cells in their pre-ovulatory follicles than other prolific breeds (Ricordeau et al, 1990). Additionally, a very weak estradiol signal to induce full estrus behaviour is sufficient for this breed if compared with other breeds (Ben Säid et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

“…Possibly, results of the effect of ewe genotype on estrus behaviour could be related with differences in the adaptation level to heat stress conditions. Pelibuey sheep has the ability to rapidly adapt to extreme climates without affecting its reproductive performance (Tabarez-Rojas et al, 2009); contrarily, Romanov sheep shows low estrus activity under hot environmental conditions (Ricordeau et al, 1990). Genetic adaptation to heat stress is possible both with respect to regulation of the body temperature and cellular resistance to elevated temperatures (Hansen, 2009).…”

Section: Discussionmentioning

confidence: 99%

Reproductive efficiency of Pelibuey and Romanov × Pelibuey ewes synchronized with synthetic progesterone and low doses of PMSG under a hot environment

Macías‐Cruz¹,

Ponce-Covarrubias²,

Álvarez-Valenzuela³

et al. 2013

CZECH J ANIM SCI

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Thirty-nine multiparous ewes (19 Pelibuey and 20 Romanov × Pelibuey) treated with fluorogestone acetate impregnated intravaginal sponges were used to evaluate the effects of low pregnant mare serum gonadotropin (PMSG) doses and genotype on their reproductive efficiency under heat stress conditions. The sponge treatment lasted for 12 days, and 24 h before sponge removal, ewes of each genotype were injected with 140 or 280 IU of PMSG. Ewes showing estrus were naturally mated twice. Reproductive performance was not affected (P > 0.05) by the dose × genotype interaction. All treated ewes presented estrus signs within a 48-h period after sponge removal. Shorter (P < 0.05) estrus interval and higher (P < 0.05) fecundity were observed in ewes treated with 280 IU of PMSG compared to those treated with 140 IU. Pelibuey ewes exhibited shorter (P < 0.01) estrus interval and greater (P < 0.01) fertility as compared with Romanov × Pelibuey ewes. The response to estrus, gestation length, prolificacy, and percentage of single and multiple lambing were not affected (P > 0.05) by dose or genotype. In conclusion, under heat stress conditions, low PMSG doses as 140 or 280 IU can be used to successfully induce and/or synchronize the estrus in Pelibuey ewes and their crosses with Romanov, regardless of reduced fertility observed in crossed Pelibuey ewes. If a more predictable and compact estrus is required, administration of 280 IU of PMSG is recommended.

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“…Crossbreeding with Romanov sheep has been practiced in several countries of the Mediterranean basin (Ricordeau et al, 1990) to take advantage of high lamb vigor and rapid growth rates. In Eastern Turkey, crossbreeding of fat tailed ewes with Romanov started in 2004 to increase prolificacy .…”

Section: Introductionmentioning

confidence: 99%

Growth and reproductive traits of purebred and crossbred Romanov lambs in Eastern Anatolia

Korkmaz¹,

Emsen²

2016

Anim Reprod

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The performance of purebred Romanov (R) lambs and crossbred lambs of Romanov and Morkaraman (M) breeding were compared under a semi-intensive production system. The M breed is a fattailed breed native to Eastern Anatolia, Turkey. Analyses were conducted on data from 168 lambs produced from R and M ewes through laparoscopic artificial insemination (LAI) with the semen of pure R and F1 RxM rams. Pure R, F1 (RxM, ½ R), and ¼ R (RxM x M backcross) lambs were produced. The F1 and ¼ R lambs had heavier (P < 0.05) birth weights than R lambs while F1 and R lambs had heavier (P < 0.05) weaning weights than ¼ R lambs. The three groups of lambs differed (P < 0.05) from each other for age of puberty in males and females where with R lambs were the youngest, F1 lambs were intermediate, and ¼ R lambs were the oldest. The percentage of ewe lambs that exhibited estrus within one year of age was higher (P < 0.01) for R (100%) and F1 (67%) lambs than for ¼ R lambs (43%). In conclusion, improvement in growth and early reproductive traits can be obtained from crossbreeding the fat-tailed Morkaraman breed with the Romanov breed.

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I.N.R.A. research on the Romanov sheep breed in France: A review

Cited by 48 publications

References 37 publications

The high prolificacy of D’man sheep is associated with the segregation of the FecL^L mutation in the B4GALNT2 gene

The high prolificacy of D’man sheep is associated with the segregation of the FecL^L mutation in the B4GALNT2 gene

Reproductive efficiency of Pelibuey and Romanov × Pelibuey ewes synchronized with synthetic progesterone and low doses of PMSG under a hot environment

Growth and reproductive traits of purebred and crossbred Romanov lambs in Eastern Anatolia

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I.N.R.A. research on the Romanov sheep breed in France: A review

Cited by 48 publications

References 37 publications

The high prolificacy of D’man sheep is associated with the segregation of the FecLL mutation in the B4GALNT2 gene

The high prolificacy of D’man sheep is associated with the segregation of the FecLL mutation in the B4GALNT2 gene

Reproductive efficiency of Pelibuey and Romanov × Pelibuey ewes synchronized with synthetic progesterone and low doses of PMSG under a hot environment

Growth and reproductive traits of purebred and crossbred Romanov lambs in Eastern Anatolia

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The high prolificacy of D’man sheep is associated with the segregation of the FecL^L mutation in the B4GALNT2 gene

The high prolificacy of D’man sheep is associated with the segregation of the FecL^L mutation in the B4GALNT2 gene