Effects of Comb Dubbing on the Performance of Laying Stocks

Fairfull, R. W.; Crober, D. C.; Gowe, R. S.

doi:10.3382/ps.0640434

Cited by 9 publications

(3 citation statements)

References 9 publications

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“…Minimizing and controlling variability is important in quality control [1], agricultural production systems [2] and experimental education [3,4]. Tests for the equality of variances are often of interest also as a preliminary to the analysis of variance, dose-response modelling or discriminant analysis, but a strong concern should be made in these cases.…”

Section: Introductionmentioning

confidence: 99%

Levene type tests for the ratio of two scales

Marozzi

2011

Journal of Statistical Computation and Simulation

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Tests for the equality of variances are of interest in many areas such as quality control, agricultural production systems, experimental education, pharmacology, biology as well as a preliminary to analysis of variance, dose-response modelling or discriminant analysis. The literature is vast. Traditional nonparametric tests are due to Mood, Miller and Ansari-Bradley. A test which usually stands out in terms of power and robustness against non normality is the W50 Brown-Forsythe (1974) modification of the Levene (1960) test. This paper deals with the two-sample scale problem and in particular with Levene type tests. We consider ten Levene type tests: the W50 test, the M50 and L50 tests (Pan, 1999), the R test (O’Brien, 1979), as well as the bootstrap and permutation versions of the W50, L50 and R tests. We consider also the F test, the modified Fligner-Killeen (1976) test, an adaptive test due to Hall and Padmanabhan (1997) and two tests due to Shoemaker (1995 and 1999). The aim is to identify effective methods for detecting scale differences. Our study is different with respect to the other ones since is focused on resampling versions of the Levene type tests, and many tests considered here have not ever been proposed and/or compared. The computationally simplest test found robust is W50. Higher power, while preserving robustness, is achieved by considering resampling Levene type tests like the permutation R test (recommended for normal- and light-tailed distributions) and the bootstrap L50 test (recommended for heavy-tailed and skewed distributions). Among non Levene type tests, the best one is the adaptive test due to Hall and Padmanabhan

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Section: Introductionmentioning

confidence: 99%

Levene type tests for the ratio of two scales

Marozzi

2011

Journal of Statistical Computation and Simulation

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“…The higher EN shown in the current population is a result of selection for early period partrecords [from the onset of lay to 40 weeks of age]. This approach is crucial approach for improving egg production in egg-type chicken flocks to make a substantial genetic improvement [26].…”

Section: Effect Of Environmental Factorsmentioning

confidence: 99%

Assessment Performance Across Generations of Iraqi Indigenous Brown Chickens Under Selection for High Egg Production

Hassan,

Razuki,

Al-Nedawi

2023

IOP Conf. Ser.: Earth Environ. Sci.

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A study was conducted to evaluate sexual and productive performance of Iraqi indigenous brown chickens. Data were descended from 2234 females across six-generation of selection for high egg production. Data of age at first egg [AFE], body weight at first egg [BWFE], first egg weight [FEWT], egg weight [EW], egg number [EN], and egg mass [EM] were recorded individually. The average of AFE, BWFE, FEWT, EW, EN and EM was 149.31d, 1489.59g, 35.7g, 44.44g, 110.39 egg\hen, and 4895.01g, respectively. Monthly gg number was 10.07, 20.35, 21.16, 20.12, 19.36, 18.13 egg\hen from moth 1 to 6 respectively. Monthly egg weights were 37.69, 41.51, 44.23, 45.78, 47.46, 48.72 g from moth 1 to 6 respectively. Monthly egg mass was 379.91, 849.78, 935.46, 921.31, 918.84, and 882.43 g from moth 1 to 6 respectively. The effect of generation, hatch and season showed highly significant effect on sexual and productive traits. The higher FEWT and BWFE shown in the second generation compared to other generations. The cumulative EN and EM from the onset of lay to 43 weeks of age varied between generations where the highest EN and EM was recorded in the six-generation compared to the first generation. EW achieved better values in the second generation [47.60g] while the lowest was recorded in the third to the sixth generations [ca 43.0g]. EW increased with age-progressive. The hatch effect had a significant effect on FEWT, BWFE, AFE, EN, EW, and EM. Hens hatched first achieved better performance compared to the second hatch. The effect of season was significant on FEWT, BWFE, AFE, EN, EW, and EM. Birds hatched in the spring season achieved higher FEWT, BWFE, EW, and greater days to reach maturity. The overall EN for the hens hatched in the spring season was significantly lower than their counterparts hatched in the other season times. Birds hatching in the winter season achieved higher EN than in other seasons. Results suggest that Iraqi brown local chickens shown in the current work have good potential for egg-productive traits and could be used as a gene pool for enhancing egg production through selection approaches.

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“…Problems concerning comparison of variability are of interest in many areas. Minimizing and controlling variability is important in quality control (Nair and Pregibon, 1988), in agricultural production systems (Fairfull et al, 1985), in experimental education (Games et al, 1972;Olejnik and Algina, 1988). Tests for the equality of variances are often of interest also as a preliminary to analysis of variance, doseresponse modeling or discriminant analysis, but a strong argument should be made in these cases.…”

Section: Comparing Variabilitymentioning

confidence: 99%

Nonparametric Hypothesis Testing

Bonnini¹,

Corain²,

Marozzi³

et al. 2014

Wiley Series in Probability and Statistics

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Effects of Comb Dubbing on the Performance of Laying Stocks

Cited by 9 publications

References 9 publications

Levene type tests for the ratio of two scales

Levene type tests for the ratio of two scales

Assessment Performance Across Generations of Iraqi Indigenous Brown Chickens Under Selection for High Egg Production

Nonparametric Hypothesis Testing

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