Power of phenotypes in discriminating Awassi sheep to pure strains and from other breeds

Al-Atiyat, Raed M.; Tabbaa, M. J.; Barakeh, Faisal S; Awawdeh, F. T.; Baghdadi, Savinaz H

doi:10.1007/s11250-021-02578-6

Cited by 3 publications

(3 citation statements)

References 25 publications

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“…It has been suggested in the literature that breed selection can be based on shank circumference, and the larger the shank circumference is, the larger the body size of the livestock. More economic benefits can be produced ( 27 ). In the stepwise regression analysis of Ujumqin sheep, the impact of adding shank circumference on prediction weight was not significant, and the effect of gender sex on the sizes of shank circumference was not significant.…”

Section: Discussionmentioning

confidence: 99%

Identification of body size characteristic points based on the Mask R-CNN and correlation with body weight in Ujumqin sheep

Qin

Dai²,

Zhang³

et al. 2022

Front. Vet. Sci.

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The measurements of body size data not only reflect the physical fitness, carcass structure, excellent growth condition, and developmental relationship among tissues and organs of animals but are also critical indicators to measure the growth and development of sheep. Computer vision-based body size identification is a non-contact and stress-free method. In this study, we analyzed different body size traits (height at wither, body slanting length, chest depth, chest circumference, shank circumference, hip height, shoulder width, and rump width) and the body weight of 332 Ujumqin sheep and significant correlations (P < 0.05) were obtained among all traits in Ujumqin sheep. Except for shoulder width, rump width, and shank circumference, all were positively correlated, and the effect of sex on Ujumqin sheep was highly significant. The main body size indexes affecting the body weight of rams and ewes were obtained through stepwise regression analysis of body size on body weight, in order of chest circumference, body slanting length, rump width, hip height, height at wither, and shoulder width for rams and body slanting length, chest circumference, rump width, hip height, height at wither and shoulder width for ewes. The body slanting length, chest circumference, and hip height of ewes were used to construct prediction equations for the body weight of Ujumqin sheep of different sexes. The model's prediction accuracy was 83.9% for the rams and 79.4% for ewes. Combined with a Mask R-CNN and machine vision methods, recognition models of important body size parameters of Ujumqin sheep were constructed. The prediction errors of body slanting length, height at wither, hip height, and chest circumference were ~5%, chest depth error was 9.63%, and shoulder width, rump width, and shank circumference errors were 14.95, 12.05, and 19.71%, respectively. The results show that the proposed method is effective and has great potential in precision management.

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Section: Discussionmentioning

confidence: 99%

Identification of body size characteristic points based on the Mask R-CNN and correlation with body weight in Ujumqin sheep

Qin

Dai²,

Zhang³

et al. 2022

Front. Vet. Sci.

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“…The morphological characteristics are the most important traits describing the meat yield of farm animals beside body weight (BW) (at birth, weaning, and marketing), growth rate, reproductive e ciency, and carcass characteristics (Sen et al, 2021). As a result, morphological characteristics are an important tool for describing breed standards and their development abilities (Al-Atiyat et al, 2021;Cam et al, 2010). Therefore, describing the breed's morphological characteristics is an essential step before developing strategies for a breeding program aiming at improving the breed productivity (Yilmaz et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Phenotypic characteristics and factors associated with Assaf lamb body weight and morphology

Aljamaeen,

Tabbaa,

Al-Atiyat

et al. 2023

Preprint

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The phenotypic characteristics of animals are result of the complex interaction of a number of genetic and non-genetic factors, which usually act simultaneously and it is difficult to determine the degree of influence of each of them. The goal of this study was to describe Assaf lamb morphology and its relationship with body weight (BW) at various ages, which had not previously been described in Jordan, and only adult Assaf had been described globally. BWs and phonotypical characteristics measurements were taken on 405 lambs, 208 lambs at birth (within three days of birth), 96 lambs at weaning (around 60 days), and 101 lambs at marketing age (around 120 days). The measurements were; withers height (WH), body length (BL), chest girth (CG), chest depth (CD), head length (HL), head width (HW), rump length (RL), RW (RW), shoulder width (SW), shin circumference (SC), foreleg height (FLH), rump height (RH) and rear leg height (RLH). Month of birth (MO) significantly (P < 0.001) affected BW and all morphological characteristics except CD and RW at birth. At weaning BW weight, HL, CG, RL, CD, SW, and RW were significantly (P < 0.001) affected by MO. MO has an effect on BW, HW, CG, SC, BL, RL, CD, SW and RW. Factors such as the sex of the lamb, birth type, and dam age significantly affected different morphological characteristics. Furthermore, BW was positively correlated with different morphological characteristics at different ages. On the other hand, equations were developed to predict BW at birth, weaning, and marketing based on various morphological characteristics while taking high into account.

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“…As the domestication center, the animals reared in this region have valuable genetic variation [5]. The Awassi is the most widely bred fat-tail sheep in the Near and Middle East [6] and the most common sheep breed in the Palestinian Authority, Iraq, Syria, and the only native breed in Jordan [7]. Until now, genetic variation in PRNP has been investigated in Awassi sheep reared in Türkiye and the Palestinian Authority [8,9], but not in Saudi Arabia.…”

Section: Introductionmentioning

confidence: 99%

Novel Prion Protein Gene Polymorphisms in Awassi Sheep in Three Regions of the Fertile Crescent

Rashaydeh,

Yildiz,

Alharthi

et al. 2023

Veterinary Sciences

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Scrapie is a fatal, neurodegenerative disease that affects sheep and goats, and genetic susceptibility to scrapie in sheep is associated with polymorphisms in the prion protein (PRNP) gene. The aim of this study is to identify PRNP polymorphism in Awassi sheep from Türkiye, the Palestinian Authority, and Saudi Arabia. A total of 150 healthy sheep were genotyped for PRNP, using Sanger sequencing. There were seven alleles and eleven genotypes observed based on codons 136, 154, and 171 of PRNP. The ARQ allele was predominant in all populations. The most resistant allele to scrapie, ARR, was present in all three regions. The VRQ allele, associated with the highest susceptibility to scrapie, was detected only in Türkiye at a low frequency. In this study, twenty-seven amino acid substitutions were found. Eight of them (R40Q, G65E, H88L, S98T, A118P, S138T, V192F and L250I) have not been previously reported. These data indicate that sheep breeds close to the sheep domestication center have maintained high genetic diversity in the PRNP region. Our findings on PRNP will provide valuable insights for sheep breeding programs, aiding in the selection of genotypes resistant to scrapie in Türkiye, the Palestinian Authority, and Saudi Arabia.

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Power of phenotypes in discriminating Awassi sheep to pure strains and from other breeds

Cited by 3 publications

References 25 publications

Identification of body size characteristic points based on the Mask R-CNN and correlation with body weight in Ujumqin sheep

Identification of body size characteristic points based on the Mask R-CNN and correlation with body weight in Ujumqin sheep

Phenotypic characteristics and factors associated with Assaf lamb body weight and morphology

Novel Prion Protein Gene Polymorphisms in Awassi Sheep in Three Regions of the Fertile Crescent

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