Parameter estimates for greasy fleece weight of Rambouillet sheep at different ages.

Lee, J W; Waldron, D. F.; Vleck, L.D. Van

doi:10.2527/2000.7882108x

Cited by 12 publications

(8 citation statements)

References 9 publications

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“…The lower estimates for reproductive traits indicate the presence of lower additive genetic variance as they are largely influenced by environment factors. Lee et al (2000) and Khan et al (2015) reported similar estimates for GFW. Moderate to high heritability estimates for production traits suggested presence of sufficient additive genetic variance which could be utilized for improvement.…”

Section: Genetic Parametersmentioning

confidence: 54%

Genetic studies on growth, reproduction and wool production traits in Harnali sheep

Lalit

Malik

Dalal

et al. 2016

IJAR

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Data on growth, reproduction and wool traits of 1603 Harnali sheep maintained at Lala Lajpat Rai University of Veterinary and Animal Sciences, Hisar over a period of 22 years were utilized for genetic analysis. The overall least squares mean for birth weight (BW), weaning weight (WW), six month body weight (SMW), age at first lambing (AFL), weight at lambing (WL), average lambing interval (ALI), greasy fleece weight (GFW), staple length (SL) and Fibre diameter (FD) were estimated as 3.35±0.02 kg, 12.41±0.08 kg, 16.30±0.12 kg, 707.05±2.07 days, 26.91±0.10 kg and 402.85±2.40 days, 1.62±0.02 kg, 5.65±0.03 cm and 25.85±0.07 µ, respectively. The effect of year of birth, sex of lamb and dam's weight at lambing were significant for all growth traits. The effect of year of birth and dam's weight at lambing were significant for all reproduction traits and GFW. No definite trend was observed over the years for body weights and reproductive traits. The effect of sex was significant for early growth traits. The heritability estimates were moderate for all the growth traits with high genetic correlations of BW and WW with SMW. Reproduction traits had lower estimates of heritability which indicated presence of lower additive genetic variance for these traits. Heritability estimates for studied wool traits were moderate to high. Positive genetic and phenotypic correlation of BW and WW with six month body weight and grease fleece weight indicated that selection for six month body weight would increase body weight and grease fleece weight.

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Section: Genetic Parametersmentioning

confidence: 54%

Genetic studies on growth, reproduction and wool production traits in Harnali sheep

Lalit

Malik

Dalal

et al. 2016

IJAR

View full text Add to dashboard Cite

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“…However, lower estimates of heritability for greasy fleece weight at 12 months of age were reported by Fogarty (1995) in meat breeds (0.19) and Nagy et al. (1999) in a Hungarian dual‐purpose breed (0.12), and higher estimates have been reported for several dual‐purpose breeds (Notter & Hough 1997; Lee et al. 2000; Hanford et al.…”

Section: Resultsmentioning

confidence: 83%

Estimation of (co)variance components and genetic parameters of greasy fleece weights in Muzaffarnagari sheep

Mandal

Neser²,

Roy

et al. 2009

J Animal Breeding Genetics

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Variance components and genetic parameters for greasy fleece weights of Muzaffarnagari sheep maintained at the Central Institute for Research on Goats, Makhdoom, Mathura, India, over a period of 29 years (1976 to 2004) were estimated by restricted maximum likelihood (REML), fitting six animal models including various combinations of maternal effects. Data on body weights at 6 (W6) and 12 months (W12) of age were also included in the study. Records of 2807 lambs descended from 160 rams and 1202 ewes were used for the study. Direct heritability estimates for fleece weight at 6 (FW6) and 12 months of age (FW12), and total fleece weights up to 1 year of age (TFW) were 0.14, 0.16 and 0.25, respectively. Maternal genetic and permanent environmental effects did not significantly influence any of the traits under study. Genetic correlations among fleece weights and body weights were obtained from multivariate analyses. Direct genetic correlations of FW6 with W6 and W12 were relatively large, ranging from 0.61 to 0.67, but only moderate genetic correlations existed between FW12 and W6 (0.39) and between FW12 and W12 (0.49). The genetic correlation between FW6 and FW12 was very high (0.95), but the corresponding phenotypic correlation was much lower (0.28). Heritability estimates for all traits were at least 0.15, indicating that there is potential for their improvement by selection. The moderate to high positive genetic correlations between fleece weights and body weights at 6 and 12 months of age suggest that some of the genetic factors that influence animal growth also influence wool growth. Thus selection to improve the body weights or fleece weights at 6 months of age will also result in genetic improvement of fleece weights at subsequent stages of growth.

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“…The power to detect association for hip OA in our report was a limiting factor as only 99 dogs were available for this analysis and only the Labrador retrievers and the crosses to Greyhounds were included for this phenotype. Within dog breeds on average, LD is extensive (0.5–1.0 Mb), whereas across breeds, the extent of LD is less than 10 Kb [18], [19], [52]. Labrador retrievers are diversified even within breed as illustrated in Figure S5 .…”

Section: Discussionmentioning

confidence: 99%

Differential Genetic Regulation of Canine Hip Dysplasia and Osteoarthritis

et al. 2010

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BackgroundCanine hip dysplasia (HD) is a common polygenic trait characterized by hip malformation that results in osteoarthritis (OA). The condition in dogs is very similar to developmental dysplasia of the human hip which also leads to OA.Methodology/Principal FindingsA total of 721 dogs, including both an association and linkage population, were genotyped. The association population included 8 pure breeds (Labrador retriever, Greyhounds, German Shepherd, Newfoundland, Golden retriever, Rottweiler, Border Collie and Bernese Mountain Dog). The linkage population included Labrador retrievers, Greyhounds, and their crosses. Of these, 366 dogs were genotyped at ∼22,000 single nucleotide polymorphism (SNP) loci and a targeted screen across 8 chromosomes with ∼3,300 SNPs was performed on 551 dogs (196 dogs were common to both sets). A mixed linear model approach was used to perform an association study on this combined association and linkage population. The study identified 4 susceptibility SNPs associated with HD and 2 SNPs associated with hip OA.Conclusion/SignificanceThe identified SNPs included those near known genes (PTPRD, PARD3B, and COL15A1) reported to be associated with, or expressed in, OA in humans. This suggested that the canine model could provide a unique opportunity to identify genes underlying natural HD and hip OA, which are common and debilitating conditions in both dogs and humans.

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Parameter estimates for greasy fleece weight of Rambouillet sheep at different ages.

Cited by 12 publications

References 9 publications

Genetic studies on growth, reproduction and wool production traits in Harnali sheep

Genetic studies on growth, reproduction and wool production traits in Harnali sheep

Estimation of (co)variance components and genetic parameters of greasy fleece weights in Muzaffarnagari sheep

Differential Genetic Regulation of Canine Hip Dysplasia and Osteoarthritis

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