Genetic Analysis of Preweaning and Postweaning Lamb Growth Traits

Thrift, F. A.; Whiteman, J. V.; Kratzer, D. D.

doi:10.2527/jas1973.364640x

Cited by 20 publications

(16 citation statements)

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“…Estimates for the heritability of preweaning average daily gain were smaller than those reported by Ercanbrack and Price (1977) for Rambouillet and Targhee lambs (.27 and .36, respectively) but similar to their estimate for Columbia lambs (.08). Other studies have also reported small heritability estimates for preweaning gain (Harrington et al, 1962;Vogt et al, 1967;Thrift et al, 1973). Similarly, estimates for the heritability of average daily gain to weaning were similar to those for weaning weight reported by Tosh and Kemp (1994) and Al-Shorepy and Notter (1996).…”

Section: Within Trait Groupssupporting

confidence: 76%

Genetic parameters among weight, prolificacy, and wool traits of Columbia, Polypay, Rambouillet, and Targhee sheep.

Bromley

Snowder

Vleck

2000

Journal of Animal Science

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Genetic parameters for Columbia, Polypay, Rambouillet, and Targhee sheep were estimated using REML with animal models for prolificacy, weight, and wool traits. All bivariate analyses included a covariance between additive genetic effects for the two traits plus appropriate additional covariances. Number of observations by breed ranged from 5,140 to 7,095 for prolificacy traits, from 7,750 to 9,530 for weight traits, and from 4,603 to 34,746 for wool traits. Heritability estimates ranged from .03 to .11 for prolificacy traits (litter size at birth and litter size at weaning), from .09 to .26 for weight traits (birth weight and average daily gain), and from .25 to .53 for wool traits (fleece weight, fleece grade and staple length). Estimates of direct genetic correlations among prolificacy and among weight

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Section: Within Trait Groupssupporting

confidence: 76%

Genetic parameters among weight, prolificacy, and wool traits of Columbia, Polypay, Rambouillet, and Targhee sheep.

Bromley

Snowder

Vleck

2000

Journal of Animal Science

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“…These findings are directly comparable to those reported in earlier studies conducted on Awassi lambs. Heritability estimates for BWT were higher than those found by (21)(22)(23)(24), and lower than those found by (25,26).…”

Section: Resultscontrasting

confidence: 62%

Birth and weaning weights of Awassi lambs raised in the GAP International Agricultural Research and Training Center

VURAL

2015

Ankara Üniversitesi Veteriner Fakültesi Dergisi

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Summary:In this study, the data were collected from 1271 heads of Awassi lambs raised in the GAP International Agricultural Research and Training Center in Diyarbakır, Turkey. Birth and weaning weight (at 90 days) of lambs were measured and average daily weight gain from birth to weaning was calculated. The effect of the years and season of lambing, age of dam, sex and birth type on birth weight (BWT), weaning weight (WWT) and average daily weight gain (ADWG) from birth to weaning were investigated. Overall means were 4.81±0.022 kg for BWT, 22.99±0.196

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“…Their values were considered low to moderate. Heritability estimates of 0.10, 0.19, 0.18, and 0.16 for BW of Awassi lambs were reported by Kazzal (1973), Thrift et al (1973), Aziz (1977), and Gursoy et al (1995). The higher estimates of 0.29 and 0.41 for the same breed were obtained by Al-Hilali (1982), and Alkass et al (1991).…”

Section: Resultsmentioning

confidence: 77%

BLUP Values of Birth to Weaning Growth Traits of Awassi Lambs in Iraq

Al-Samarai¹

2015

Russian Journal of Biological Research

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This study was carried out on the research station of sheep and goat (Abo Gharib, west of Baghdad, Iraq) to investigate the effects of some environmental factors on some growth traits in Awassi lambs as well as estimating heritability of these traits. Records of Awassi lambs included 1318 birth weights (BW), 821 weaning weights (WW) and 821 pre-weaning daily gains (DG) as recorded over three years (2007)(2008)(2009). Records belonged to 120 sires. Restricted Maximum Likelihood (REML) method in a mixed model (paternal half sib) was utilized to estimate the heritability (h²) for above mentioned traits. The general statistical model included fixed effects due to parity, sex, year and month of birth, type of birth and age at weaning as covariate. The Best Linear Unbiased Prediction (BLUP) values of sires for all studied traits were estimated. Results showed that the means of BW, WW and DG were 3.85, 26.64 and 0.181 kg respectively. Studied traits were significantly (P < 0.01) affected by all fixed effects except the effect of sire on WW and DG, which was significant (P< 0.05). Heritability estimates (h²) of BW, WW and DG were 0.23, 0.12 and 0.19 respectively. The lowest and highest BLUP values for the mentioned traits were -0.325, 0.255 kg, -1.142, 1.284 kg, and -0.103, 0.053 kg respectively.

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Genetic Analysis of Preweaning and Postweaning Lamb Growth Traits

Cited by 20 publications

References 0 publications

Genetic parameters among weight, prolificacy, and wool traits of Columbia, Polypay, Rambouillet, and Targhee sheep.

Genetic parameters among weight, prolificacy, and wool traits of Columbia, Polypay, Rambouillet, and Targhee sheep.

Birth and weaning weights of Awassi lambs raised in the GAP International Agricultural Research and Training Center

BLUP Values of Birth to Weaning Growth Traits of Awassi Lambs in Iraq

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