Estimates of (co)variance components and genetic parameters for pre-weaning body weight traits and Kleiber ratio in Sangsari sheep breed

Ehsaninia, Jamshid

doi:10.1080/1828051x.2021.1908860

Cited by 10 publications

(3 citation statements)

References 60 publications

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“…The coefficient of variation of each trait was between 12 and 23%, indicating that each character had a certain degree The significant effects of birth year, birth month, and birth herd could be attributed to the differences in management, food availability, diseases, and the condition of the climate and raising systems, as described by Ehsaninia (24) for Sangsari sheep and Rashidi et al (14,15) for Kermani sheep. The significant effects of sex and birth type may be attributed to several reasons such as the difference in the endocrine systems of female and male kids.…”

Section: Discussion Fixed E Ectsmentioning

confidence: 90%

“…The results revealed that sex, birth type, birth year and month of kids, birth herd, and age of dam have significant effects on BWT, WWT, ADG, and KR ( p < 0.01) in the present study and were in agreement with the previous reports on Sirohi goats ( 23 ) and Raini Cashmere goats ( 19 ). The significant effects of birth year, birth month, and birth herd could be attributed to the differences in management, food availability, diseases, and the condition of the climate and raising systems, as described by Ehsaninia ( 24 ) for Sangsari sheep and Rashidi et al ( 14 , 15 ) for Kermani sheep. The significant effects of sex and birth type may be attributed to several reasons such as the difference in the endocrine systems of female and male kids.…”

Section: Discussionmentioning

confidence: 99%

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Study of genetic parameters for pre-weaning growth traits in inner Mongolia white Arbas cashmere goats

et al. 2023

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Inner Mongolia Arbas white cashmere goats is a dual-purpose breed for producing cashmere and meat. In recent years, its meat has become more and more popular among consumers because of rich nutrients and delicious flavor. Therefore, it is particularly important to study the genetic and non-genetic factors affecting the early growth traits and estimate variance components of pre-weaning growth traits of Inner Mongolia Albas white cashmere goats. A total of 37487 kidding records such as birth weight (BWT), weaning weight (WWT), average daily gain from birth to weaning (ADG) and Kleiber ratio (KR) from 343 sires and 7296 dams were used in this study. The most appropriate model was chosen on the basis of likelihood ratio test by fitting six models which excluding or including maternal genetic, maternal permanent environmental effects. The parameters were estimated under the most appropriate model using AIREML method by WOMBAT software. With the best model (Model 6), heritability estimates were 0.0435, 0.0911, 0.0932 and 0.2339 for BWT, WWT, ADG and KR traits, respectively. Maternal heritability estimates were 0.0143, 0.0246, 0.0220 and 0.0186 for BWT, WWT, ADG, and KR traits respectively. The correlation between different traits was estimated with the most suitable model by using bivariate analysis method. The direct additive genetic correlation among the traits ranged from −0.026 (BWT~KR) to 0.772 (ADG~KR). The maternal permanent environment correlation is between −0.289 (BWT-KR) ~0.900 (WWT-ADG). Results indicated that maternal effects and direct-maternal genetic covariance should be considered in any program aimed at improving pre-weaning growth traits to have an accurate genetic evaluation. In addition, positive and medium to high genetic correlations generally exist among WWT, ADG and KR due to the existence of genetic variation for early growth traits. The results showed that the genetic progress of these traits could be slowly through selection except for KR.

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Section: Discussion Fixed E Ectsmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Study of genetic parameters for pre-weaning growth traits in inner Mongolia white Arbas cashmere goats

et al. 2023

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“…4.1 The influence of fixed effects on early growth traits and reproductive traits BY, BT, AM, BS, and LS exhibited significant impacts on BWT, WWT, and ADG (30)(31)(32)(33)(34)(35)(36)(37). This could be attributed to variations in breeding management practices and climate changes across different years (38). Seasonal changes influence the nutritional quality of forage, thereby affecting lamb weights at various stages (39)(40)(41).…”

Section: Discussionmentioning

confidence: 99%

Comparison of different animal models for estimating genetic parameters for early growth traits and reproductive traits in Tianmu Sainuo sheep

Liu,

Lu,

Tang

et al. 2024

Front. Vet. Sci.

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As the economic level of individuals rises, so too does the demand for mutton. Enhancing the breeds of mutton sheep not only boosts production efficiency and economic benefits but also fosters the sustainable growth of the mutton sheep breeding industry. Thus, this study examines the early growth and reproductive traits of Tianmu Sainuo sheep, analyzing the genetic interactions among these traits to furnish a theoretical foundation for refining breeding strategies and expediting the genetic advancement of this breed. The investigation compiled 29,966 data entries, involving 111 sires for birth weight (BWT) and 113 for other metrics. The data encompassed 10,415 BWT records from 1,633 dams, 12,753 weaning weight (WWT) records from 1,570 dams, 12,793 average daily gain (ADG) records from 1,597 dams, and 13,594 litter size (LS) records from 1,499 dams. Utilizing the GLM procedure in SAS 9.2 software, the study analyzed the non-genetic influences on lamb BWT, WWT, ADG, and LS. Concurrently, DMU software estimated the variance components across various animal models for each trait. Employing the Akaike Information Criterion (AIC) and likelihood ratio test (LRT), six models were tested, incorporating or excluding maternal inheritance and environmental impacts, to identify the optimal model for deriving genetic parameters. The findings reveal that birth year (BY), birth quarter (BQ), birth type (BT), age of mother (AM), and birth sex (BS) exerted significant impacts on BWT, WWT, and ADG (p < 0.01). Additionally, BQ and AM significantly influenced LS (p < 0.01). The most accurate genetic evaluation model determined the heritability of BWT, WWT, ADG, and LS to be 0.0695, 0.0849, 0.0777, and 0.1252, respectively.

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Genetic evaluation of growth rate and efficiency-related traits in Dorper sheep

Besufkad

Goshme

Abebe

et al. 2023

Ecological Genetics and Genomics

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Estimates of (co)variance components and genetic parameters for pre-weaning body weight traits and Kleiber ratio in Sangsari sheep breed

Abstract: To cite this article: Jamshid Ehsaninia (2021) Estimates of (co)variance components and genetic parameters for pre-weaning body weight traits and Kleiber ratio in Sangsari sheep breed, Italian

Cited by 10 publications

References 60 publications

Study of genetic parameters for pre-weaning growth traits in inner Mongolia white Arbas cashmere goats

Study of genetic parameters for pre-weaning growth traits in inner Mongolia white Arbas cashmere goats

Comparison of different animal models for estimating genetic parameters for early growth traits and reproductive traits in Tianmu Sainuo sheep

Genetic evaluation of growth rate and efficiency-related traits in Dorper sheep

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