Genetic and Phenotypic Parameters for Daily Gain and Body Weights in Suffolk Lambs

Shrestha, J. N. B.; Vesely, J. A.; Chesnais, J. P.; Cuthbertson, Daniel J.

doi:10.4141/cjas85-068

Cited by 11 publications

(7 citation statements)

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“…Only four references for 50-day weight could be found (Shrestha et al, 1985;Shrestha et al, 1986;Tosh & Kemp, 1994;Mousa et al, 1999). The heritability estimates (0.28-direct; 0.13-maternal) obtained in this study are agreement with previously published results which vary from 0.05-0.47 for direct and 0.06-0.14 for maternal effects (Shrestha et al, 1985;Shrestha et al, 1986;Tosh & Kemp, 1994;Mousa et al, 1999).…”

Section: Resultssupporting

confidence: 91%

Genetic studies on the South African Mutton Merino: growth traits

Neser¹,

Erasmus²,

Wyk³

2000

SA J. An. Sci.

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Genetic parameters were estimated for 36-, 42-, 50-, 100-and 150-day weight in the South African Mutton Merino breed. The direct heritability estimates obtained were 0.270, 0.366, 0.278, 0.185 and 0.115 respectively. The maternal heritability estimates for the respective weights were 0.494, 0.249, 0.129, 0.091 and 0.080. The correlation between the animal effects (direct and maternal) varied between -1.000 for 36-day weight to -0.376 for 150-day weight. Very little selection progress was made over the period (1980)(1981)(1982)(1983)(1984)(1985)(1986)(1987)(1988)(1989)(1990)(1991)(1992)(1993)(1994)(1995)(1996)(1997)(1998)(1999) in the breed.

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Section: Resultssupporting

confidence: 91%

Genetic studies on the South African Mutton Merino: growth traits

Neser¹,

Erasmus²,

Wyk³

2000

SA J. An. Sci.

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“…Although these lambs were lighter than those in the present study, the ranking of breeds was similar with the Suffolk breed having the highest live weight and the Texel breed having the lowest postweaning live weight. Throughout the rest of the world, many studies have recorded live weight in lambs at different time points; however, few of these studies have focused on the breeds investigated in the current study (Safari and Fogarty, 2003), although Shrestha et al (1985) reported similar findings for pre-weaning and weaning weights in Canadian Suffolks. Furthermore, a US study of Texel-and Suffolk-sired cross-bred lambs (Leymaster and Jenkins, 1993) showed similar live weight results to the present study with the Suffolk breed proving to be the heaviest at both weaning and postweaning weights in comparison to the Texel breed.…”

Section: Phenotypic Valuesmentioning

confidence: 69%

Genetic analyses of live weight and carcass composition traits in purebred Texel, Suffolk and Charollais lambs

Fitzmaurice

Conington

Fetherstone

et al. 2020

Animal

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Lamb live weight is one of the key drivers of profitability on sheep farms. Previous studies in Ireland have estimated genetic parameters for live weight and carcass composition traits using a multi-breed population rather than on an individual breed basis. The objective of the present study was to undertake genetic analyses of three lamb live weight and two carcass composition traits pertaining to purebred Texel, Suffolk and Charollais lambs born in the Republic of Ireland between 2010 and 2017, inclusive. Traits (with lamb age range in parenthesis) considered in the analyses were: pre-weaning weight (20 to 65 days), weaning weight (66 to 120 days), post-weaning weight (121 to 180 days), muscle depth (121 to 180 days) and fat depth (121 to 180 days). After data edits, 137 402 records from 50 372 lambs across 416 flocks were analysed. Variance components were derived using animal linear mixed models separately for each breed. Fixed effects included for all traits were contemporary group, age at first lambing of the dam, parity of the dam, a gender by age of the lamb interaction and a birth type by rearing type of the lamb interaction. Random effects investigated in the pre-weaning and weaning weight analyses included animal direct additive genetic, dam maternal genetic, litter common environment, dam permanent environment and residual variances. The model of analysis for post-weaning, muscle and fat depth included an animal direct additive genetic and litter common environment effect only. Significant direct additive genetic variation existed in all cases. Direct heritability for pre-weaning weight ranged from 0.14 to 0.30 across the three breeds. Weaning weight had a direct heritability ranging from 0.17 to 0.27 and postweaning weight had a direct heritability ranging from 0.15 to 0.27. Muscle and fat depth heritability estimates ranged from 0.21 to 0.31 and 0.15 to 0.20, respectively. Positive direct correlations were evident for all traits. Results revealed ample genetic variation among animals for the studied traits and significant differences between breeds to suggest that genetic evaluations could be conducted on a per-breed basis. ImplicationsThis study demonstrated the existence of genetic variation between different breeds of sheep for the three main live weight and two carcass composition traits in the Irish sheep production system suggesting that genetic evaluations should be conducted on a per-breed basis. This would allow for more informed and accurate selection decisions on farm, resulting in superior productivity and profitability within Irish sheep flocks. †

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“…Heritability of ADG from 50 to 100 d of age was estimated at 0.50 in Dorset lambs by Shrestha et al (1986). Additionally, Shrestha et al (1985) estimated the heritability of ADG from 50 to 100 d in Suffolk lambs at 0.43. Mousa et al (1999) analyzed ADG in this same composite breed of sheep using both ram and ewe lambs; heritability estimates were 0.16 and 0.23, respectively.…”

Section: Average Daily Gainmentioning

confidence: 99%

Estimates of genetic parameters for feed intake, feeding behavior, and daily gain in composite ram lambs1,2

Cammack

Leymaster

Jenkins

et al. 2005

Journal of Animal Science

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ABSTRACT:Our objective was to estimate genetic parameters for feed intake, feeding behavior, and ADG in composite ram lambs (¹⁄₂ Columbia, ¹⁄₄ Hampshire, ¹⁄₄ Suffolk). Data were collected from 1986 to 1997 on 1,239 ram lambs from approximately 11 to 17 wk of age at the U.S. Meat Animal Research Center near Clay Center, NE. Feeding equipment consisted of an elevated pen with an entrance chute that permitted access to the feeder by only one ram lamb at a time, with disappearance of feed measured by an electronic weighing system. Ram lambs were grouped 11 per pen from 1986 to 1989, and nine per pen from 1990 to 1997. Data were edited to exclude invalid feeding events, and approximately 80% of the data remained after edits were applied. Traits analyzed were daily feed intake (DFI), event feed intake (EFI), residual feed intake (RFI), daily feeding time (DFT), event feeding time (EFT), number of daily feeding events (DFE), and ADG.

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Genetic and Phenotypic Parameters for Daily Gain and Body Weights in Suffolk Lambs

Cited by 11 publications

References 1 publication

Genetic studies on the South African Mutton Merino: growth traits

Genetic studies on the South African Mutton Merino: growth traits

Genetic analyses of live weight and carcass composition traits in purebred Texel, Suffolk and Charollais lambs

Estimates of genetic parameters for feed intake, feeding behavior, and daily gain in composite ram lambs1,2

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