Genetics of Growth and Reproduction in the Turkey

Nestor, Karl E.; McCartney, M. G.; Harvey, W. R.

doi:10.3382/ps.0461374

Cited by 32 publications

(14 citation statements)

References 18 publications

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“…Johnson and Asmundson (1957), McCartney (1961), Nestor et al (1967) and McCartney et al (1968) obtained large and positive estimates for the genetic correlation between body weight at 8 and 16 and 16 and 24 weeks of age. Although the I line exhibited significant increases in 8-week body weight relative to the randombred control in the first generation of selection, there was no trend in eight week body weight in later generations in either sex.…”

Section: Resultsmentioning

confidence: 91%

Genetics of Growth and Reproduction in the Turkey

Nestor

1977

Poultry Science

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Selection for increased 16-week body weight alone resulted in a large increase in body weight and a major reduction in egg production over nine generations of selection. The realized heritability estimates for 16-week body weight were .31 ± .04 and .30 ± .03, respectively, for males and females. The realized genetic correlation between female 16-week body weight and egg production was -.42 ± .12. Large negative realized genetic correlations (-.50 to -.63) were observed between female 16-week body weight and intensity of lay traits (average clutch length, maximum clutch length and rate of lay), while generally only small non-significant positive correlations were found between body weight and broodiness traits (number of broody periods, length of broody period, and total days lost from broodiness). No significant correlations with egg weight, percent fertility or hatchability of fertile eggs were observed.Gains in 16-week body weight of from approximately 1/4 to 1/2 of those observed when selecting for body weight alone were achieved in another line without any reduction in egg production by the use of a selection index which gave three times the emphasis on 16-week body weight as on 180-day egg production. The realized heritability of 16-week body weight and the realized genetic correlations with egg production, intensity of lay traits and broodiness traits were similar in this line to those estimated in the line selected only for increased 16-week body weight.

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Section: Resultsmentioning

confidence: 91%

Genetics of Growth and Reproduction in the Turkey

Nestor

1977

Poultry Science

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“…These estimates were of similar magnitude as corresponding estimates made by analysis of variance in the randombred control population (McCartney, 1961;and Nestor et al, 1967). Abplanalp et al (1963) obtained an average realized genetic correlation of .88 between body weights at 8 and 24 weeks of age.…”

Section: Resultsmentioning

confidence: 93%

“…In general, the estimates were high (greater than .30) (see review by Nestor et al, 1967). The heritability of egg production has also been estimated by several workers (Wilson and Johnson, 1946;Shaklee et al, 1952;Blow and Glazener, 1954;Kondra and Shoffner, 1955;McCartney, 1955;Blow et al, 1958;Clayton, 1962;Cook et al, 1962;and McCartney, 1962).…”

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confidence: 89%

Genetics of Growth and Reproduction in the Turkey

1968

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“…The published estimates for the heritability of BW in turkeys did not cover the period after 24 weeks of age. For example, Nestor et al (1967) summarised heritability estimates of BW as ranging from 0.36 to 0.42 in the different age groups from 0 to 24 weeks of age. Case et al (2010) reported values of 0.35 6 0.02 for the heritability of BW at 15 weeks with the bivariate method.…”

Section: Heritabilitymentioning

confidence: 99%

Estimates of the genetic parameters of turkey body weight using random regression analysis

Rafat

Namavar

Shodja

et al. 2011

Animal

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Random regression (RR) analysis has been recommended to estimate the genetic parameters of longitudinal data. The objective of this study was to evaluate the growth of turkeys using RR models. Data were collected from 957 turkeys and included 15 478 individual body weight recorded during the first week of life and between weeks 2 and 32 by 2-week intervals. To take into account the repeated measurements of weight for each animal, a specific overall growth curve was modelled using a cubic smoothing spline. Animal deviation to this curve was also modelled using an RR function. All data were analysed with the ASReml package. The results showed an increase in heritability estimates over the trajectory and peaked at 0.60 around 20 to 32 weeks of age. Genetic correlations showed that turkeys could be selected at earlier time points, at 12 weeks of age, in order to increase the growth rate. In general, genetic correlation estimates were higher among adjacent ages, decreasing markedly with the increase of distance between ages. Negative genetic correlations were observed between ages.

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Genetics of Growth and Reproduction in the Turkey

Cited by 32 publications

References 18 publications

Genetics of Growth and Reproduction in the Turkey

Genetics of Growth and Reproduction in the Turkey

Genetics of Growth and Reproduction in the Turkey

Estimates of the genetic parameters of turkey body weight using random regression analysis

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