The Reproductive Traits of Sheep and Their Influencing Factors

Ajafar, Majeed Hameed; Kadhim, Alaa Hasan; Al‐Shuhaib, Mohammed Baqur S.

doi:10.7831/ras.10.0_82

Cited by 30 publications

(18 citation statements)

References 58 publications

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“… 34 High levels of FSH and luteinizing hormone (LH) affect ovarian follicle development and maturation, resulting in increased litter size. 35 , 36 In Dazu black goats, FST polymorphisms are associated with litter sizes. 7 Despite this, there has been little study of the relationship between FST variants and reproductive traits in livestock, and little is known about FST polymorphisms and their impact on sheep reproduction.…”

Section: Discussionmentioning

confidence: 99%

A Novel c.100C > G Mutation in the FST Gene and Its Relation With the Reproductive Traits of Awassi Ewes

Albazi

Al‐Shuhaib

Merzah

et al. 2023

Bioinform Biol Insights

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Reproductive traits are affected by many factors, including ovarian function, hormones, and genetics. Genetic polymorphisms of candidate genes are associated with reproductive traits. Several candidate genes are associated with economic traits, including the follistatin ( FST) gene. Thus, this study aimed to evaluate whether the genetic variations in the FST gene are associated with the reproductive traits in Awassi ewes. The genomic DNA was extracted from 109 twin ewes and 123 single-progeny ewes. Therefore, 4 sequence fragments from the FST gene were amplified using polymerase chain reaction (PCR) (exon 2/240, exon 3/268, exon 4/254, and exon 5/266 bp, respectively). For a 254 bp amplicon, 3 genotypes were identified: CC, CG, and GG. Sequencing revealed a novel mutation in CG genotypes c.100C > G. The statistical analysis of c.100C > G showed an association with reproductive characteristics. Ewes carrying the c.100C > G had significantly ( P ⩽ .01) lower litter sizes, twinning rates, lambing rates, and more days to lambing compared with CG and CC genotypes. Logistic regression analysis confirmed that the c.100C > G single-nucleotide polymorphism (SNP) is responsible for decreasing litter size. According to these results, the variant c.100C > G negatively affects the traits of interest and is associated with lower reproductive traits in Awassi sheep. As a result of this study, ewes carrying the c.100C > G SNP have lower litter size and are less prolific.

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Section: Discussionmentioning

confidence: 99%

A Novel c.100C > G Mutation in the FST Gene and Its Relation With the Reproductive Traits of Awassi Ewes

Albazi

Al‐Shuhaib

Merzah

et al. 2023

Bioinform Biol Insights

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“…Not to be forgotten there were also pregnant ewes with post weaning lambs, indicating that mating and lambing were occurred accordingly and was not influenced by season. Genetic and environment factors influencing the reproduction traits, where litter size is one trait that has high economic value [18]. The performance of litter size was largely affected by genetic factor on the number of eggs ovulated by the ewes and non-genetic factors such as the feeds consumed by the ewes.…”

Section: Discussionmentioning

confidence: 99%

Reproduction characteristic of local sheep in North Sumatra Province, Indonesia

Tiesnamurti,

Febretrisiana,

Anwar

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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In Indonesia, sheep farming is an important activity and contribute significantly to meat production and farmers welfare. This study aimed to evaluate the reproduction activities of sheep from several districts in North Sumatra Province. Data were analyzed using general linear model with body weight, body condition score and litter size as dependent variables, whereas the independent variables was location, breed, sex and age, respectively. The result showed that body weight was significantly influenced (P<0.05) by sex, age and location of the study with LS mean of 21.7 kg. The least square means of body condition score was 2.1 and there was significant contribution (P<0.05) of location, sex and age, respectively. The least square means of litter size from this study was 1.36, with the range from 1-3 and there was no significant influence (P>0.05) of location, breed and age, respectively. The higher proportion of ewes compared to ram, the availability young sheep as well as the pre-weaning lambs, indicating that mating, lambing and raising post weaning lambs occurred accordingly and not influenced by season. The plantation areas seem favorable for sheep development in the region.

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“…This makes them a more cost-effective option for meat production (Kasiriyan et al, 2011;Mirzaee Ilaly et al, 2019). Ajafar et al (2022) report that red meat consumption has increased by 5 to 6% per year in developing countries, and the amount of meat produced doesn't meet the growing population's needs, so breeding programs must be conducted in the sheep industry to increase meat production e ciency. Reproductive traits, along with growth traits play an essential role in the biological aspect of meat production, in addition to growth traits.…”

Section: Introductionmentioning

confidence: 99%

A study on the genetic and phenotypic factors affecting specific ewe productivity traits in Sangsari sheep

Ehsaninia

2024

Preprint

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The study's objectives were to assess the genetic parameters of reproductive characteristics in Sangsari sheep. A data set of reproductive information with pedigree details from 1995 to 2016 was used. Studied traits were litter size at birth (LSB), litter size at weaning (LSW), litter mean weight per lamb born (LMWLB), litter mean weight per lamb weaned (LMWLW), total litter weight at birth (TLWB) and total litter weight at weaning (TLWW). Test significance of the environmental factors to be included in the model was conducted using the general linear model procedure of the SAS program. All traits were significantly affected by the year of lambing and ewe age at lambing (P < 0.01). The AI-REML procedure of the Wombat program was used to evaluate genetic parameters. A series of bivariate animal models were employed to calculate genetic (rg) and phenotypic (rp) correlations between traits. The total least square means ± standard error of LSB, LSW, LMWLB, LMWLW, TLWB, and TLWW were 1.04 ± 0.05, 0.96 ± 0.03, 3.12 ± 0.08, 15.40 ± 0.13, 3.28 ± 0.04, and 19.31 ± 0.16, respectively. The estimates of h2 were relatively low and ranged from 0.063 ± 0.028 for LSW to 0.181 ± 0.063 for TLWW. Repeatability estimates varied from 0.101 for LSW to 0.241 for TLWW. The sire service effects for LMWLB, TLWB, and TLWW were 0.012 ± 0.004, 0.023 ± 0.006, and 0.039 ± 0.009, respectively. The traits studied showed a greater magnitude of genetic correlation than phenotypic correlation, with values ranging from − 0.59 (LSB-LMWLB) to 0.87 (LMWLB-TLWB). It appears that focusing on TLWW for selection could result in more significant improvements in the reproductive performance of Sangsari ewes.

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The Reproductive Traits of Sheep and Their Influencing Factors

Cited by 30 publications

References 58 publications

A Novel c.100C > G Mutation in the FST Gene and Its Relation With the Reproductive Traits of Awassi Ewes

A Novel c.100C > G Mutation in the FST Gene and Its Relation With the Reproductive Traits of Awassi Ewes

Reproduction characteristic of local sheep in North Sumatra Province, Indonesia

A study on the genetic and phenotypic factors affecting specific ewe productivity traits in Sangsari sheep

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