Genotype × Environment interactions in pig breeding programmes. II. Environmental effects and genetic parameters in central test

Merks, J.W.M.

doi:10.1016/0301-6226(87)90040-6

Cited by 20 publications

(9 citation statements)

References 27 publications

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“…Genetic correlations among carcass traits were negative between CDG and CFT, and positive between CDG and LEAN, indicating that all these three traits could be easily improved by selection simultaneously. This is in good agreement with the results reported in Dutch and Swedish pigs also tested on restricted feeding [14,22].…”

Section: Genetic Correlationssupporting

confidence: 93%

“…differences in milk production capacity leading to differences between litters in early growth, a component of LDG but not TDG. In other populations fed either on a restricted or semi-restricted scale, the common litter effects were found to range from −3 to 28% for ADG, 32 to 42% for ages to 100 kg, −6 to 26% for UBF and 13 to 19% for TFC [3,4,13,17,22]. Variances due to common litter effects were not significantly greater than zero for any carcass composition traits, in agreement with the estimates reported by Lundeheim et al [17], Merks [22] and Johansson et al [13].…”

Section: Heritabilities and Common Litter Effectsmentioning

confidence: 98%

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Genetic parameters and responses of performance and body composition traits in pigs selected for high and low growth rate on a fixed ration over a set time

Nguyen

McPhee

2005

Genet. Sel. Evol.

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-Two lines of Large White pigs of common genetic origin were divergently selected over four years for high and low growth rate during a 6 week post-weaning test period in which all pigs were fed the same total amount of food (80% of estimated ad libitum intake). Genetic parameters and direct and correlated responses in performance and carcass traits were estimated on 2884 pigs with pedigrees comprising a total of 5324 animals, with restricted maximum likelihood and best linear unbiased prediction methods applied to a multi-trait animal model. Estimates of heritability (±SE) were 0.19 ± 0.04 for lifetime daily gain (LDG), 0.16 ± 0.03 for test daily gain (TDG), 0.25 ± 0.04 for ultrasound P2 backfat (UBF) and 0.16 ± 0.03 for food conversion ratio during test (TFC), and 0.15 ± 0.04 for daily carcass weight gain (CDG), 0.43 ± 0.06 for carcass backfat (CFT) and 0.40 ± 0.06 for carcass lean percentage (LEAN). Common litter effects for TDG, UBF and TFC were less than 5% and for LDG, 17% of total phenotypic variance. Genetic correlations between performance and carcass traits were moderately to highly favourable. After four years of divergent selection for growth rate, the selection responses in estimated breeding value (EBV) for TDG were 40.14 and -41.11 g (SED 2.95) for the high and low growth lines, respectively. The regressions of EBV on year of birth, indicate that the annual genetic trend for TDG, was 8.73 g/yr in the high and -8.48 g/yr in the low lines (P < 0.001). Correlated genetic responses in the high and low lines respectively were 5.28 g and -12.40 g (SED 2.09) in LDG, -0.35 mm and 0.56 mm (SED 0.009) in UBF, -0.145 units and 0.185 units (SED 0.012) in TFC, 3.17 g and -10.97 g (SED 1.53) in CDG, -1.13 mm and 1.01 mm (SED 0.155) in CFT and 1.24% and -1.27% (SED 0.150) in LEAN. It was concluded that selection for increased post-weaning daily gain on a ration of fixed amount reduces the age at slaughter and the level of backfat and increases the efficiency of food utilisation, weight and leanness of pig carcasses. divergent selection / pig / growth / restricted feeding / genetic responses

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Section: Genetic Correlationssupporting

confidence: 93%

Section: Heritabilities and Common Litter Effectsmentioning

confidence: 98%

Genetic parameters and responses of performance and body composition traits in pigs selected for high and low growth rate on a fixed ration over a set time

Nguyen

McPhee

2005

Genet. Sel. Evol.

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“…Because genetic variation for energy partitioning may decline as populations become leaner, the effectiveness of selection may suffer in pigs, especially when feeding is restricted (Hill and Webb, 1982). This concern is heightened by recent results from Holland (Merks, 1987), where the estimated heritabilities for daily gain of Yorkshire and Landrace pigs on restricted feeding were low (0-14 and 0-22, respectively).…”

mentioning

confidence: 86%

Estimates of genetic and phenotypic parameters of growth and carcass traits from closed lines of pigs on restricted feeding

Haley²,

Thompson

1989

Anim. Sci.

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Data from two selected lines of pigs in closed herds of a breeding company were collected over a 5-year period. The lines were selected for growth rate and leanness and were housed together in the same environment. Animals were performance tested from 35 kg for about 58 days, and were fed individually according to a scale determined by time on test; the boars were more liberally fed than the gilts. At the end of test, average daily gain (ADG) values were calculated and ultrasonic measures were taken of fat depths at the shoulder (SF), loin (LF) and last rib, 4-5 cm (CF) and 8 cm (KF) off the mid line.Estimates of heritabilities, phenotypic and genetic correlations were obtained from paternal half-sib analyses. All heritability estimates were significantly different from zero and ranged from 0-18 to 0-42 for ADG and from 0-21 to 0-59 for fat depths. The genetic correlations between ADG and fat measurements in boars of the two lines were not significantly different from zero, averaging 0-08; in the gilts they were negative, averaging -0-39.After long-term selection, appreciable genetic variation remained in the closed lines studied here for growth rate and fat depths. Although sex and feeding level were confounded, it is likely that the genetic correlation between growth rate and fat depth was influenced by the level of feeding and associated with partitioning of energy between lean and fat deposition.

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“…All these studies used classical estimation methods such as parent-offspring regression or Henderson's methods (Henderson, 1953 (1980,1981) (Wyllie et al, 1979;Cameron et al, 1988). As suggested by Cameron (1990) Nilsson, 1979;Lundeheim et al, 1980;Ollivier, 1983;Andersen and Vestergaard, 1984;Busse and Groeneveld, 1986;Merks, 1987; Schworer et at, i987; Cole et al, 1988). Differences between estimates may be related to variations in the frequency of the halothane gene in the populations studied (Sellier, 1988).…”

Section: Genetic Parametersmentioning

confidence: 99%

Multivariate restricted maximum likelihood estimation of genetic parameters for growth, carcass and meat quality traits in French Large White and French Landrace pigs

Ducos¹,

Bidanel²,

Ducrocq³

et al. 1993

Genet Sel Evol

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Summary -Genetic parameters of 7 traits measured in central test stations -average daily gain (ADG1), feed conversion ratio (FCR) and backfat thickness (ABT) measured on candidates for selection, and average daily gain (ADG2), dressing percentage (DP), estimated carcass lean content (ECLC) and meat quality index (MQI) 0,30; 0,6/,; 0,22; 0,52; 0,39; 0,60; 0,33 en race LW et 0,3l,; 0,56; 0,25; 0,l!6; 0,31; 0,68; 0,23

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Genotype × Environment interactions in pig breeding programmes. II. Environmental effects and genetic parameters in central test

Cited by 20 publications

References 27 publications

Genetic parameters and responses of performance and body composition traits in pigs selected for high and low growth rate on a fixed ration over a set time

Genetic parameters and responses of performance and body composition traits in pigs selected for high and low growth rate on a fixed ration over a set time

Estimates of genetic and phenotypic parameters of growth and carcass traits from closed lines of pigs on restricted feeding

Multivariate restricted maximum likelihood estimation of genetic parameters for growth, carcass and meat quality traits in French Large White and French Landrace pigs

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