Heritability Estimates of Adult Body Weight and Egg Production Traits in Indigenous Uttara Chickens

A total of 320 twenty week-old slow and rapid feathering Saudi Arabian Baladi pullers were used to assess the effect of sex-linked feathering genes on body weight, age at sexual maturity, feed intake and subsequent laying performance. Similar numbers of rapid feathering Leghorns pullets were included in the study for the purpose of comparison. The experimental birds of each genotypic group were randomly divided into four replicates and subjected to standard management practices. Slow feathering Baladi pullers had higher (P<0.05) adult body weight, rate of mortality, and feed intake and a similar age at sexual maturity but showed lower (P< 0.05) hen-day, and hen-housed egg production and feed conversion compared with rapid feathering Baladi pullets. Rapid feathering Leghorns had higher (P<0.05) adult body weight. age at sexual maturity, hen-day egg production, rate of mortality and feed intake and lower feed intake/kg eggs than rapid and slow feathering Baladi. However, rapid feathering Baladi and Leghorns had similar hen-housed egg production and feed intake per dozen eggs and had better (l’<0.05') performance than slow feathering Baladi.

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Synthesis of stocks and phenotypic effects of dwarf and bantam sex-linked major genes in egg-type chickens

Brazilian Journal of Genetics ◽

10.1590/s0100-84551997000300003 ◽

1997 ◽

Vol 20 (3) ◽

pp. 371-376

Author(s):

Randolfo William Silvestre Custódio

Keyword(s):

Body Weight ◽

Sexual Maturity ◽

Egg Production ◽

Egg Laying ◽

White Leghorn ◽

Major Genes ◽

Adult Body ◽

Adult Body Weight ◽

The Difference

The present study describes the production of stocks segregating dwarf (dw), bantam (dwB) and normal (dw+) alleles, as well as the characters, shank length, adult body weight, age at sexual maturity and egg production. Heterozygous K dw+/k dwB sires were mated to normal (dw+) dams to produce stock D6.a, and mated to dwB females to produce stock D6.b. Stock D4.a came from mating F1 heterozygous dwB dw sires to dwarf Leghorns. In a third series of matings, 7/8 Sebright and 1/8 dw-Leghorn dwB dw sires were crossed to three groups of dams of different genotypes. The progeny of the normal (dw+), dwarf (dw), and bantam (dwB) dams were designated as stocks D4.b, D4.c and D4.d, respectively. The dw+ dams were White Leghorn strain cross females. The difference between the rate of laying of normal (69.7%) and their bantam sisters (68.6%) was not statistically significant when the average 32-week body weight of the dw+ sisters was 1,897 g. However, when the 32-week body weight of the normal daughters from the same sires and smaller dams was around 1,646 g, the difference between the rate of laying of the normal (78.1%) and their bantam sisters (75.9%) was significant (P < 0.05). The dwB gene may have a similar but smaller effect on the rate of egg laying than its dwarf allele. The difference between sexual maturity of normal and bantam daughters of either the largest or the smallest dams was not statistically significant, even though the smallest dwB pullets were in average 2.9 days older at first egg. The use of shank length combined with adult body weight allowed a precise discrimination between bantams and dwarfs

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Sire-Hatch Interaction Effect on Egg Production, Sexual Maturity and Adult Body Weight in Meat-type Chickens

Japanese poultry science ◽

10.2141/jpsa.15.225 ◽

1978 ◽

Vol 15 (5) ◽

pp. 225-229

Author(s):

Hiroshi SHIMIZU

Keyword(s):

Body Weight ◽

Interaction Effect ◽

Sexual Maturity ◽

Egg Production ◽

Adult Body ◽

Adult Body Weight ◽

Meat Type

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Faculty Opinions recommendation of Adult body weight is programmed by a redox-regulated and energy-dependent process during the pronuclear stage in mouse.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.13489060.14866185 ◽

2012 ◽

Author(s):

Keith Jones

Keyword(s):

Body Weight ◽

Dependent Process ◽

Adult Body ◽

Adult Body Weight ◽

Energy Dependent

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Oral Character and Attitudes and Behavior Related to Food and Eating

Psychological Reports ◽

10.2466/pr0.1988.63.1.15 ◽

1988 ◽

Vol 63 (1) ◽

pp. 15-18 ◽

Cited By ~ 2

Author(s):

Jon K. Mills ◽

Jean Cunningham

Keyword(s):

Body Weight ◽

Developmental Stages ◽

Female College Students ◽

Adult Personality ◽

Adult Body ◽

Adult Body Weight ◽

Projective Measure ◽

And Behavior ◽

Attitudes And Behavior ◽

Early Developmental

Freudian theory predicts that adult personality characteristics and behavior will reflect unresolved conflicts from early developmental stages. In this study, a card from the Blum's Blacky test was used as a projective measure of oral conflict with 35 male and 61 female college students. The presence of such conflict was significantly associated with deviations from norms for body weight, greater variability in adult body weight, rating food as important, and eating more frequently. However, ratings of preoccupation with food were not significantly related to scores for oral conflict. These findings support predictions from psychoanalytic theory and also point to the continued usefulness of the Blacky test in psychoanalytic research.

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DOMINANCE AND EPISTASIS IN HETEROSIS OF WHITE LEGHORN STRAIN CROSSES

Canadian Journal of Animal Science ◽

10.4141/cjas87-070 ◽

1987 ◽

Vol 67 (3) ◽

pp. 663-680 ◽

Cited By ~ 20

Author(s):

R. W. FAIRFULL ◽

R. S. GOWE ◽

J. NAGAI

Keyword(s):

Body Weight ◽

Sexual Maturity ◽

Egg Production ◽

Significant Contribution ◽

Production Traits ◽

White Leghorn ◽

Cross Combination ◽

Commercial Strain ◽

Better Than

Four unrelated pure strains of White Leghorns including a grandparent strain from industry and 12 two-strain, 24 three-strain, 24 four-strain and 12 F2 strain crosses produced contemporaneously were used to examine the role of dominance and epistasis in heterosis. A control strain and a commercial strain were also included. For egg weight, the heterosis observed closely approximated that expected due to dominance alone. For sexual maturity and body weight, dominance was the major component of heterosis, but epistasis made a significant contribution — additive by additive (A × A) genetic effects for sexual maturity and 140-d body weight, and parental epistasis for mature body weight. Both dominance and epistasis played a significant role in heterosis for egg production traits. A × A, dominance by dominance (D × D) and additive by dominance (A × D) epistasis were all important for hen-housed egg production and hen-housed egg yield. For hen-day rate of egg production, A × A epistasis was significant only early in the laying year (to 273 d), A × D and D × D were significant to 385 d and in the full year (to 497 d); however, none (A × A, A × D and D × D) was significant near the end of lay (386–497 d). Overall heterosis estimates for full year egg production measured as hen-housed egg production to 497 d or hen-day rate from housing to 497 d clearly showed that on average two-strain crosses were superior to three-strain crosses which were superior to four-strain crosses which in turn exceeded the F2 crosses. Nevertheless, several three-strain crosses had performance for egg production that was equal to or better than the two-strain cross with the highest egg production. Thus, in commerce, where the level of egg production is of great economic importance, the testing and use of a specific three-way cross combination will usually result in a better commercial product. Key words: Heterosis, egg production genetics, epistasis, stocking rate, strain cross, White Leghorn

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Performance Evaluation of Kuroiler and Sasso Chicken Breeds Reared under On-farm and On-station Management Conditions in Tanzania

European Journal of Agriculture and Food Sciences ◽

10.24018/ejfood.2021.3.2.254 ◽

2021 ◽

Vol 3 (2) ◽

pp. 53-59

Author(s):

Fadhili S. Guni ◽

Said H. Mbaga ◽

Andalwisye M. Katule

Keyword(s):

Body Weight ◽

Egg Production ◽

Linear Models ◽

Farm Management ◽

General Effect ◽

Production Traits ◽

Gxe Interaction ◽

Live Body Weight ◽

Egg Production Rate ◽

On Farm

A study was conducted to evaluate the effect of management, breed, and their interaction on growth performance, egg production, and survivability under on-station and on-farm management conditions in Tanzania. A total of 1200 chicks, 600 for each breed, Kuroiler, and Sasso of mixed sexes were used. Birds under on-station management were confined and fed commercial ration throughout the experiment while those under on-farm management were allowed to semi-scavenge and supplemented with available feeds in the household. Brooding was carried out on-station for six weeks. Thereafter, birds were sub-divided for on-station and on-farm evaluation where data on body weight, egg production traits, and survival rate were taken at different ages from week 6 up to 52. The General Linear Models procedure fitting management, breed, and interaction between management and breed was used to analyze the data. Results show that management conditions had a significant influence on the performance of the breeds. Birds reared on-station performed better in all traits measured than those reared on-farm. The general effect of the breed was significant only for hen-day egg production (HDEP %) and hen-housed egg production (HHEP) in favour of Sasso chickens. Similarly, Sasso was more efficient at converting feed to live body weight. Interactions between management and breed were observed for all traits except peak egg production rate and mortality rate. While Sasso performance was better than that of Kuroiler on body weight, age at first egg, HDEP, age at peak egg production, and HHEP under the on-station management system, their performance in these traits were similar under the on-farm management except for body weight and age at first egg where Kuroiler was superior to Sasso. The survivability was also higher for Kuroiler than for Sasso under both management systems. It is concluded that genotype by environment (GxE) interaction had significant effects on the performance of the two breeds thus, a need to consider such effect when promoting them for either on-station or on-farm rearing.

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