Genetic and environmental effects on body measurements in broiler chickens

Merritt, E. S.

doi:10.31274/rtd-180813-979

Cited by 2 publications

(3 citation statements)

References 22 publications

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“…Results of the apparent significant increase of BW 1 for selected line compared to control in G 4 and G 5 were supported by Dunnington and Sigel (1985) who found that the greater effect of selection had been observed for breast angle in later studied generations. Moreover, Abou EL-Ghar and Ragaa (2016) found the same results of body weight increase at 12-wk of age for selected line compared to control,whereas, Merritt (1958) found that selection for breast width after four generation had no significant influence on body weight. Referring to the increase of BC for the selected line compared to the control among studied generations, Ragaa and Ashour (2014) came to the same outcome.…”

Section: Methodsmentioning

confidence: 85%

Genetic Response of Some Body Males Measurements and Reproduction for Gimmizah Chickens Selected for Body Circumference

Boutrous¹

2021

EPSJ

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this experiment was conducted on Gimmizah (GM) chickens aiming to investigate the effect of selection for breast circumference at twelve weeks of age through six generations on some physical characters of males and hatchability besides estimating some genetical sire parameters among the selected generations. Two hundred and twenty hens besides twenty two males were randomly chosen from (GM) flock and considered as base population (G 0 ) composing pen's families (10hens and one male / pen). Day-old chicks produced from G 0 were wing-banded and selected for breast circumference (BC) at 12-wk of age within families. Chickens were selected as parents of the next generation and continued throughout five generations. A total number of 6750 hatching eggs representing the six experimental consecutive generations were used for hatching trials. Data were collected for some physical parameters of GM males at 1 day, 8, 12, 25 and 45 weeks of age for six generations. Hatched male body weights (BW 1 ) were significantly higher for selected line among G 0 , G 4 and G 5 generations compared to those for control one. Selection for chicken BC significantly improved fertility percentage with advanced generations. Moreover, fertility percentage was significantly increased for selected chickens compared to those for control line at fifth generation. Heritability estimates seem to be high for all body weights at studied ages through the sixgeneration ranked between 0.50 among the most ages and generations with 0.97 for BW 8 and BW 12 at G 4 .Also, BC represented high estimates of among the ages and generations ranged between 0.32 for BC 12 at G 5 and 0.69 for BC 12 at G 0 .Genetic correlations between fertility and body weights among the studied generations were low differed between 0.10 up to 0.34, with value of 0.28 for BW 1 at G 5 . It is concluded from this study that fertility trait should be taken into consideration during selection of breast circumference, besides other breast measurements such as breast length and width should be included in the coming genetic selection program.

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Section: Methodsmentioning

confidence: 85%

Genetic Response of Some Body Males Measurements and Reproduction for Gimmizah Chickens Selected for Body Circumference

Boutrous¹

2021

EPSJ

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“…Variance component estimates of farm or location effects on broiler weight of approximately 10 percent were found by Merritt and Gowe (1956) and Merritt (1957). Lonsdale et al (l957) found that debeaking at day-old by removing one-third of the maxilla and mandible, in four trials consistently retarded growth to 10 weeks although not significantly so.…”

Section: Growthmentioning

confidence: 82%

“…Ghostley (1955) noted a downward trend in 8 week weight as the hatching season progressed. Goodman and God frey ( 1954) attributed 11 percent of the total variation in 9 week weight to hatch effect, but Merritt (1957) obtained estimates close to zero in chickens of both sexes at 12 weeks of age.…”

Section: Growthmentioning

confidence: 99%

Factors influencing the efficiency of strain comparisons in random sample testing of meat-type chickens

Collins

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Genetic and environmental effects on body measurements in broiler chickens

Cited by 2 publications

References 22 publications

Genetic Response of Some Body Males Measurements and Reproduction for Gimmizah Chickens Selected for Body Circumference

Genetic Response of Some Body Males Measurements and Reproduction for Gimmizah Chickens Selected for Body Circumference

Factors influencing the efficiency of strain comparisons in random sample testing of meat-type chickens

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