scholarly journals Linear Estimates of Heritability and Genetic Correlation for Egg Production, Body Weight, Conformation and Egg Weight of Turkeys

1975 ◽  
Vol 54 (1) ◽  
pp. 11-23 ◽  
Author(s):  
J.A. Arthur ◽  
Hans Abplanalp
Keyword(s):  
Body Weight ◽  
Genetic Correlation ◽  
Egg Production ◽  
Egg Weight ◽  
Production Body

scholarly journals Breeding for the improvement of indigenous chickens in Bangladesh: performance of second generation

2017 ◽  
Vol 3 (1) ◽  
pp. 66-71
Author(s):  
Shakila Faruque ◽  
AKFH Bhuiyan ◽  
Md Yousuf Ali ◽  
MSK Sarker ◽  
Ziaul Faruque Joy
Keyword(s):  
Body Weight ◽  
Egg Production ◽  
Second Generation ◽  
Breeding Value ◽  
Genotype 3 ◽  
Indigenous Chicken ◽  
Egg Weight ◽  
Slaughter Age ◽  
Dressing Percentage ◽  
Egg Production Rate

The improvement of productivity of indigenous chicken is a long desire in the country. Present research is a part of the long-term selection program being undertaken to evaluate the carcass characteristics and expected response to selection of second generation (G2) of indigenous chicken under intensive management in Bangladesh. A total of 1643-day-old chicks comprising of 3 types of chicken namely Naked Neck (NN), Hilly (H) and Non-descript Desi (ND) were hatched in a two batches for this study. In second generation (G2), selection was practiced at 3 (three) stages of birds life, firstly and secondly at 8 and at 16 weeks of age, selection was performed on the basis of breeding value for 8 and 16 week body weight. Thirdly, at 40-week of age, on the basis of an index comprising the parameters of age at sexual maturity (ASM), body weight (BW), egg production (EP) and egg weight (EW). Improvement target of egg weight was to increase by 1g and improvement target of egg production rate was to increase by 2 % per generation. The main target was the mean body weight in H, ND and NN chicken has to be gone up from the initial eight-week body weight of 375, 342 and 331g to 500 g at eight weeks of age. At 8, 10 and 12 weeks of age, six birds from each genotype were slaughtered to analyze the meat yield traits. Slaughter data were analyzed in a 3(genotype)×3(slaughter age) factorial arrangement in CRD by General Linear Model (GLM) Univariate Procedure in SPSS Computer Program. Genotype and slaughter age had significant effect (p<0.001) on dressing percentage. Body weight at 8 weeks of age was expected to improve by 51.21 vs. 24.03; 37.74 vs. 15.47 and 26.26 vs. 9.65g; respectively for ND, H and NN males and females. In terms of body weight H genotype was superior and NN genotype was for dressing percentage. As a result of selection; EP, BW increased and ASM reduced in second generation than that of the foundation stock.Asian J. Med. Biol. Res. March 2017, 3(1): 66-71

Genetic parameters for egg weight v. age curve, and other egg production and egg weight traits, in synthetic lines of chickens

1983 ◽  
Vol 34 (1) ◽  
pp. 85 ◽  
Author(s):  
BH Yoo ◽  
BL Sheldon ◽  
RN Podger
Keyword(s):  
Standard Deviation ◽  
Genetic Correlation ◽  
Egg Production ◽  
Genetic Parameters ◽  
Genetic Correlations ◽  
Egg Mass ◽  
Control Line ◽  
Egg Weight ◽  
Egg Number ◽  
Selection For

An exponential curve, W = P-Qexp(- Rt), where W is egg weight at age t, was fitted to egg weights of individual pullets, and genetic parameters were estimated for P, Q and R, the residual standard deviation and other egg weight and egg production characters. The data consisted of records collected over six generations on more than 4000 pullets in two selection lines and a control line which originated from a synthetic gene pool of White Leghorn x Australorp crosses. The half-sib and offspring-on-parent regression estimates of heritability pooled over the lines were 0.23 and 0.33 for P, 0.14 and 0.20 for Q, and 0.14 and 0.25 for R. Genetic correlations were estimated to be -0.10 between P and Q, -0.46 between P and R, and 0.90 between Q and R. These estimates suggest that the egg weight v. age curve may be modified to increase the proportion of eggs in desirable weight grades and reduce the incidence of oversized eggs later in the production year. The genetic correlation between mean weight of first 10 eggs and egg weight at 62 weeks of age was estimated to be 0.68, further suggesting that early egg weight may be improved partly independently of late egg weight. The heritability estimates of egg mass output were not higher than those of egg number in spite of the highly heritable average egg weight being an important component of egg mass, probably because of the negative genetic correlation (r = -0.49) between egg number and average egg weight. The standard deviation of individual pullet's egg weights was moderately heritable and genetically correlated positively with egg weight characters and negatively with egg production; these estimates were consistent with the responses to selection for reduced egg weight variability observed elsewhere

SUBSTITUTION OF SORGHUM FOR WHEAT IN DIETS FOR LAYING HENS

1982 ◽  
Vol 62 (1) ◽  
pp. 305-306 ◽  
Author(s):  
E. E. GARDINER ◽  
D. J. MAJOR ◽  
S. DUBETZ
Keyword(s):  
Body Weight ◽  
Key Words ◽  
Egg Production ◽  
Laying Hens ◽  
Feed Consumption ◽  
White Leghorn ◽  
Egg Weight ◽  
Single Comb

The effects of substituting various levels of sorghum for wheat in diets for laying hens were studied. Egg production, egg weight, feed consumption, body weight and hatchability of eggs from Single Comb White Leghorn hens were not affected by the proportion of sorghum in the diet. Key words: Sorghum, wheat, nutrition, egg production

Comparative performance of Vanaraja, Srinidhi and Desi chicken under traditional system among tribal community of Assam

2018 ◽  
Author(s):  
M. Sarma ◽  
R. Islam ◽  
M. K. Borah ◽  
P. Sharma ◽  
J. D. Mahanta ◽  
...  
Keyword(s):  
Body Weight ◽  
Mortality Rate ◽  
Field Condition ◽  
Egg Production ◽  
Reproductive Traits ◽  
Tribal Community ◽  
Comparative Performance ◽  
Egg Weight ◽  
Traditional System

A study was conducted covering a total of one hundred chicken farmers in tribal dominated Boko Block of Kamrup district in Assam to assess different productive and reproductive traits of Desi, Vanaraja and Srinidhi birds under field condition. Information was obtained on mean body weight at various ages, age at first egg, annual egg production, fertility and hatchability and mortality rate. Body weight, egg production and egg weight were significantly (P£0.05) higher in Vanaraja and Srinidhi birds compared to Desi chicken. The age at first egg was significantly (P£0.05) higher in Desi chicken while compared with Vanaraja and Srinidhi under traditional system of management. However no significant (P£0.05) difference was found between Vanaraja and Srinidhi in their body weight and egg production at various ages. Higher mortality percent in Vanaraja (12.23±1.62) and Srinidhi (11.34±1.23) were recorded during 0 to 5 week. No significant (P£0.05) differences were found among all three groups of birds in fertility and hatchability.

Polymorphism of Prolactin gene in relation to egg productionperformance in Kadaknath hens

2016 ◽  
Author(s):  
Shiv Kumar Yadav ◽  
S. K. Maurya ◽  
Alok Kumar Yadav ◽  
Kamalesh Yadav ◽  
K. D. Singh
Keyword(s):  
Body Weight ◽  
Promoter Region ◽  
Egg Production ◽  
Gene Locus ◽  
Production Performance ◽  
Indel Polymorphism ◽  
Native Page ◽  
Wing Vein ◽  
Egg Weight ◽  
Prolactin Gene

Present study was carried out to study egg production performance and polymorphism of Prolactin gene at 24 bp indel locus at promoter region (PRL24). Egg production performances were recorded as age at first egg (AFE), Body Weight at First Egg (WFE), Mean Egg Weight (MEW) and Total No. of Eggs at 90 days of laying (TEN). DNA was isolated from blood of 20 Kadaknath birds collected from wing vein. PRL24 locus for indel polymorphism was amplified by PCR and the product was resolved on 6% native PAGE for genotyping. The AFE (d), WFE (Kg), MEW (g) and TEN of Kadaknath hens in the present study were found to be 188.00±0.71, 1.26±0.03, 42.83±0.21 and 37.75±0.59 respectively. The Prolactin gene locus PRL24 showed two alleles I and D and three genotypes: II, ID and DD. The frequencies of I and D alleles at this locus were 0.55 & 0.45 respectively. The birds of D allele had a significantly (P<0.05) better TEN than birds of I allele.

Effect of feeding different levels of lysine and protein on the performance of WLH layers

2017 ◽  
Author(s):  
Naga Raja Kumari K ◽  
Ravinder Reddy V ◽  
Chinni Preetham V ◽  
Srinivas Kumar ◽  
D.Sen A.R. ◽  
...  
Keyword(s):  
Body Weight ◽  
Feed Intake ◽  
Feed Efficiency ◽  
Egg Production ◽  
Egg Mass ◽  
Egg Weight ◽  
Protein Levels ◽  
Lysine Concentration ◽  
Different Levels ◽  
Effect Of Feeding

A trial was conducted to evaluate the requirement of digestible lysine at various protein levels in the diet of WLH layers (BV-300) from 25-44 weeks of age. Layers (528) were fed with diets containing two protein levels i.e. 13.36 and 15.78 % each with 5 % concentration variations of lysine (0.50, 0.55, 0.60, 0.65, and 0.70) and a control with 17 % CP and 0.70 % lysine. Each diet was fed to six replicates of eight birds. Egg production, feed intake, body weight were not influenced either by the concentration of lysine or by level of protein in diet. Increased (P d” 0.05) egg weight and egg mass were observed with increasing lysine in diets. Better feed efficiency was observed with increasing lysine concentration. It can be concluded that WLH layers require approximately 0.65% lysine with 13.36% CP or 0.63% lysine with 15.78% CP (i.e. 598.80 vs 570 mg/h/day) in diet.

Effect of methionine and lysine supplementation of diets for laying hens, on production and feed intake

1976 ◽  
Vol 27 (5) ◽  
pp. 739 ◽  
Author(s):  
MW McDonald ◽  
IJ Bruce
Keyword(s):  
Body Weight ◽  
Feed Intake ◽  
Egg Production ◽  
Function Analysis ◽  
Basal Diet ◽  
Metabolizable Energy ◽  
Feed Consumption ◽  
Multiple Regression Equation ◽  
Weight Changes ◽  
Egg Weight

Six diets containing five levels of methionine and two of lysme were each fed to 12 Leghorn and 12 Australorp pullets for a period of 16 weeks Body weight changes, egg production, egg weight and feed intake were measured Although responses to the diets did not differ significantly In univariate analyses, multrvarrate analysis lndicated a srgnificant interaction between breeds and diets. Increased methionine produced small, significant Increases In egg weight, although responses were inconsistent at different levels Body weight gains were not significantly different between diets. Egg production and feed consumption were significantly affected by diet?, but the pattern of response was also inconsistent. A discriminate function analysis showed a consistent response to increased methionine, which indicated that the basal diet was deficient and that the pullets required a total of 0 275% methionine in their diet Lysine supplementation produced a 'significant decrease In feed intake but had no significant effect on any other variable.A multiple regression equation relating metabolizable energy intake to the variables measured in the experiment was calculated and compared with others reported In the literature This was used to predict the requirements of the pullets for a number of essential amino acids.

scholarly journals Effect of Phytase Supplementation on the Performance of Babcock-380 Layer Hens

2021 ◽  
Vol 1 (1) ◽  
pp. 36-41
Author(s):  
MD. Ruhul Amin ◽  
Elliyana Nadia Hamidi
Keyword(s):  
Body Weight ◽  
Egg Production ◽  
Egg Size ◽  
Basal Diet ◽  
Experimental Period ◽  
Egg Mass ◽  
Egg Weight ◽  
Treatment Groups ◽  
Microbial Phytase ◽  
Production Group

 In order to examine the effect of phytase supplementation in the diet of laying hen this experiment was conducted with 30 commercial hybrid Babcock-380 layers of 73 weeks of age. The hens were grouped into 3 treatment groups and given microbial phytase (Rena Phytase 400) at levels 2.5, 1.5 and 0 (control) g/kg feed in addition to their basal diet (110 g commercial pellet/day). Records on egg production/group/day, egg mass weight/day, body weight of hens at the end of experimental period were taken and analysed. Results revealed that hen house egg production (HHEP) and egg weight (EW) varied (p<0.05) among the treatment groups but level of phytase did not affect (p<0.05) body weight of hens. Both HHEP and EW were in order of 2.5>1.5>0 g/kg feed phytase group and all the means were significantly (p<0.05) different from each other within treatment groups. Microbial phytase supplementation in layer ration proved to be beneficial in terms of egg production and egg size even after 72 weeks of age of hens. Layer farms in Malaysia can use this technology to earn more profit.

Four statistical tests for detecting major genes in an Iranian pedigree chicken flock

2007 ◽  
Vol 2007 ◽  
pp. 249-249
Author(s):  
Sadegh Alijani ◽  
Hassan Mehrabani Yeganeh ◽  
Ardashir Nejati Javaremi ◽  
Ghodratollah Rahimi ◽  
L.L.G. Janss
Keyword(s):  
Body Weight ◽  
Egg Production ◽  
Statistical Tests ◽  
Chicken Flock ◽  
Egg Weight ◽  
Major Genes ◽  
Production Period

The objective of this research was to look for the evidence of segregating major genes in an Iranian pedigree chicken flock (Mazandaran station), using four statistical tests: Normality, Bartlett, Fain and Mixture tests for four economically important traits. These traits are age at first egg (AFE), body weight at the end of week eight (BW8), average egg weight (EW) and number of eggs laid during egg production period (EN).

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