Genetic analysis of growth, production and reproduction traits afterlong-term selection in Rhode Island Red chicken

2016 ◽  
Author(s):  
Sanjeev Kumar
Keyword(s):  
Rhode Island ◽  
Egg Production ◽  
Selection Criterion ◽  
Least Square ◽  
Economic Traits ◽  
Term Selection ◽  
Body Weights ◽  
Reproduction Traits ◽  
Genetic And Phenotypic Correlations ◽  
Growth Production

In present investigation, 325 single-hatched RIR chicks that has undergone 30 generation of selection based on 40-week part-period egg production were evaluated for growth and layer economic traits using least-squares analysis of variance. Overall least-square means of body weight at 16, 20, 40 and 64 weeks of age were 1362.6±21.4g, 1791.6±24.5g, 2184.6±26.2g and 2433.8±34.2g, respectively. Males were significantly heavier than females (P£0.001) at all ages. Least-square means of age at sexual maturity, egg weight at 28, 40 and 64 weeks of age, egg number up to 40 and 64 weeks of age were 134.5±0.9days, 44.8±0.3g, 47.73±0.4g, 51.5±0.7g, 118.3±1.2eggs and 214.5±4.8eggs, respectively. Heritability estimates were high for growth and low to medium for layer economic traits. Genetic and phenotypic correlations among body weights were high and positive. The egg production up to 40 weeks revealed high and positive genetic (0.89±0.15) as well as phenotypic (0.63) correlations with egg production up to 64 weeks suggesting the its usefulness as selection criterion for genetic improvement of annual egg production.

scholarly journals GENETIC AND PHENOTYPIC ASSOCIATIONS OF JUVENILE BODY WEIGHTS AND EGG PRODUCTION TRAITS IN TWO STRAINS OF RHODE ISLAND CHICKENS

2021 ◽  
Vol 18 ◽  
pp. 66-70
Author(s):  
O. O. ONI ◽  
B. Y. ABUBAKAR ◽  
S. O. OGUNDIPE
Keyword(s):  
Body Weight ◽  
Rhode Island ◽  
Sexual Maturity ◽  
Egg Production ◽  
Genetic Parameters ◽  
Laying Hens ◽  
Genetic Correlations ◽  
Selection Criterion ◽  
Production Traits ◽  
Body Weights

Data on body weight at 16 (WT16); 20 (WT20) weeks of age and at sexual maturity (WTSM) weight of first egg (WT1st), age at sexual maturity (ASM) and 120-d egg production (EN)  were used to estimate genetic parameters in 636 hens of two strains of Rhode Island chikens. There were significant (P.01) differences between  the two strains for all traits except for WTSM.The heritability estimates obtained ranged from 0.05 to 0.41 and 0.04 to 0.30 for strains 1 and 2 respectively. The genetic correlations obtained for the various traits were medium to high for the two strains. The phenotypic correlations were generally low but followed the same trend. The results indicate that selected stocks of the two strains would show improvements in egg production and age   at sexual maturity if juvenile body weight (WT20) is employed as a selection criterion at housing for laying hens.

scholarly journals Nest acceptance, clutch, and oviposition traits are promising selection criteria to improve egg production in cage-free system

PLoS ONE ◽  
2021 ◽  
Vol 16 (5) ◽  
pp. e0251037
Author(s):  
Lorry Becot ◽  
Nicolas Bedere ◽  
Thierry Burlot ◽  
Jenna Coton ◽  
Pascale Le Roy
Keyword(s):  
Rhode Island ◽  
Selection Criteria ◽  
Egg Production ◽  
Genetic Correlations ◽  
Breeding Systems ◽  
Likelihood Method ◽  
Free System ◽  
Genetic And Phenotypic Correlations ◽  
High Heritability ◽  
The Mean

In cage-free systems, laying hens must lay their eggs in the nests. Selecting layers based on nesting behavior would be a good strategy for improving egg production in these breeding systems. However, little is known about the genetic determinism of nest-related traits. Laying rate in the nests (LRN), clutch number (CN), oviposition traits (OT), and nest acceptance for laying (NAL) of 1,430 Rhode Island Red (RIR) hens and 1,008 White Leghorn (WL) hens were recorded in floor pens provided with individual electronic nests. Heritability and genetic and phenotypic correlations of all traits were estimated over two recording periods–the peak (24–43 weeks of age) and the middle (44–64 weeks of age) of production–by applying the restricted maximum likelihood method to an animal model. The mean oviposition time (MOT) ranged from 2 h 5 min to 3 h and from 3 h 35 min to 3 h 44 min after turning on the lights for RIR and WL hens, respectively. The mean oviposition interval ranged from 24 h 3 min to 24 h 16 min. All heritability and correlation estimates were similar for RIR and WL. Low to moderate heritability coefficients were estimated for LRN (0.04–0.25) and moderate to high heritability coefficients for CN and OT (0.27–0.68). CN and OT were negatively genetically correlated with LRN (-0.92 to -0.39) except during peak production for RIR (-0.30 to +0.43). NAL was weakly to moderately heritable (0.13–0.26). Genetic correlations between NAL and other traits were low to moderate (-0.41 to +0.44). In conclusion, CN and OT are promising selection criteria to improve egg production in cage-free systems. NAL can be also used to reduce the number of eggs laid off-nest in these breeding systems. However, variability in MOT must be maintained to limit competition for the nests.

Upgrading the indigenous poultry of Uganda IV. Egg production

1963 ◽  
Vol 60 (2) ◽  
pp. 225-227
Author(s):  
J. C. M. Trail
Keyword(s):  
Body Weight ◽  
Production Rate ◽  
Rhode Island ◽  
Food Consumption ◽  
Egg Production ◽  
White Leghorn ◽  
Egg Weight ◽  
Body Weights ◽  
The Cross ◽  
Egg Production Rate

Data on egg production, egg weight, food consumption, broodiness, mortality and body weights of the progeny of indigenous poultry of Uganda crossed with Light Sussex, White Leghorn, Rhode Island Red and Black Australorp breeds were collected collected over the 25-week period from 161 to 336 days of age and compared with the performances of indigenous poultry.In comparison with the indigenous birds, the cross-breeds had a 61% higher mean egg production rate, a 34% lower food consumption per pound of eggs produced, a 15% higher egg weight, a 30% reduction in mortality, a 23% increase in body weight and a decrease in broodiness.All the cross-breeds were superior in productive respects to the indigenous birds and the White Leghorn and Light Sussex breeds appeared to be the best for use in the upgrading of indigenous stock for highest egg production results.

Growth performance of Pantja goats under field conditions in their home tract

2018 ◽  
Author(s):  
B. S. Khadda ◽  
Brijesh Singh ◽  
D. V. Singh ◽  
S. K. Singh ◽  
Jyoti Palod ◽  
...  
Keyword(s):  
Body Weight ◽  
Growth Performance ◽  
Random Effect ◽  
Least Square ◽  
Field Conditions ◽  
Research Project ◽  
Body Weights ◽  
Genetic And Phenotypic Correlations ◽  
Field Unit ◽  
Animal Sciences

The present research was conducted to study the growth performance of 906 Pantja kids of 514 goats sired by 26 bucks maintained by registered farmers under All India Co-ordinated Research Project on goats (Pantja field Unit) running in College of Veterinary and Animal Sciences, G. B. Pant University of Agriculture and Technology, Pantnagar (Uttarakhand) during 2015-16. The overall least-square means for body weight at birth, 3, 6, 9 and 12 months of age were found to be 1.89±0.02, 9.49±0.20, 13.09±0.18, 16.38±0.19 and 18.84±0.22 kg, respectively. The random effect of sire was highly significant (P less than 0.01) on body weight at birth, 3, 6 and 9 months of age whereas, this effect was found to be significant (P less than 0.05) on 12 months body weight. The cluster had a highly significant (P less than 0.01) effect on birth, 3, 6 and 12 months body weights.Type of birth and sex of kid was found to be highly significant on birth, 3, 6, 9 and 12 months body weights. The heritability estimates were 0.25±0.09, 0.38±0.12, 0.30±0.11, 0.29±0.08 and 0.43±0.13 for body weight at birth, 3, 6, 9 and 12 months of age, respectively. The genetic and phenotypic correlations of body weight to body weight at subsequent ages were observed to be high and positive.

Genetic Studies on Growth Traits in Rajasri Variety of Backyard Chicken

2020 ◽  
Author(s):  
Ch. Pragnya ◽  
D. Sreenivas ◽  
M. Gnana Prakash ◽  
Daida Krishna
Keyword(s):  
Growth Traits ◽  
Average Daily Gain ◽  
Least Square ◽  
Research Station ◽  
Dual Purpose ◽  
Genetic Studies ◽  
Body Weights ◽  
Genetic And Phenotypic Correlations ◽  
Daily Gain ◽  
Backyard Chicken

Background: Rajasri, a synthetic dual purpose variety suitable for backyard rearing. The current study was aimed to study the inheritance of Rajasri birds. Methods: This study was carried out during April 2019 to August 2019 at poultry research station, Hyderabad. Data collected on 6980 chicks produced from 220 sires and 660 dams in half sib mating in 4 hatches were utilized to estimate the genetic parameters.Result: Highly significant (P≤0.01) influence of hatch and sex on body weights and average daily gains and shank length was observed. The overall least-squares means of body weights at birth, 2, 4, 6, 8, 10, 12, 14, 16, 18 and 20 weeks of age were 32.35±0.4, 80.87±0.17, 184.29 ±0.44, 351.49±0.76, 576.16±1.10, 741.31±0.97, 878.03±0.91, 1038.9±0.91, 1160.61±0.99, 1271.59±1.27 and 1370.64±1.72g and shank length at 4 and 6 weeks of age were 47.49±0.05 and 62.18±0.06 mm, respectively. The overall least-square means of average daily gain peaks at 6-8 weeks age. Heritability estimates of body weights through sire component ranged from 0.04±0.016 (BW20) to 0.44±0.05 (BW0). Genetic and phenotypic correlations among body weights were ranged from 0.02±0.14 (BW6-BW14) to 0.98±0.01 (BW16-BW18) and 0.003±0.01 (BW2-BW20) to 0.93±0.01 (BW18-BW20), respectively. 

GROWTH, PRODUCTION AND REPRODUCTION CHARACTERISTICS OF THE CANADIAN BREED OF CATTLE AND ITS FIRST CROSS AND BACKCROSS WITH THE BROWN SWISS. I. BODY WEIGHTS AND DIMENSIONS

1981 ◽  
Vol 61 (4) ◽  
pp. 853-860
Author(s):  
DOMINIQUE D. RONY ◽  
MOHAMED H. FAHMY ◽  
WILFRIED B. HOLTMANN
Keyword(s):  
Body Weight ◽  
Body Length ◽  
Season Of Birth ◽  
Body Dimensions ◽  
Brown Swiss ◽  
Body Weights ◽  
Growth Production

Body weight and seven body dimensions measuring the length, height, width and depth were taken at birth and every 180 days up to 720 days of age on 49 pure Canadian, 49 first cross of 1/2 Brown Swiss 1/2 Canadian, and 30 backcross of 1/4 Brown Swiss 3/4 Canadian heifers. The animals were raised up to 180 days of age at the Deschambault Station, then half the pure Canadian and the first cross were transferred to the La Pocatière Station. At birth, the pure Canadian calves weighed 29.2 kg and were lighter than the first and backcrosses by 6.9 kg (24%) and 4.8 kg (16%), respectively. The two crosses exceeded the pure Canadian in all the dimensions, the differences being significant in height at shoulder and width at rumps. At 360 days of age the two crosses were about 6% heavier and 4% higher at shoulder than the pure Canadian. With the exception of body length after 1 yr of age in which the backcross was slightly inferior to the pure Canadian, the two crosses were generally larger than the pure Canadian, with the backcross being intermediate between the first cross and the pure Canadian. The effects of season of birth and age of dam were found to be non-significant on most of the traits studied in this experiment.

Genetic parameters of Barki sheep raised under semi-arid conditions

1969 ◽  
Vol 11 (3) ◽  
pp. 361-367 ◽  
Author(s):  
M. H. Fahmy ◽  
E. Salah E. Galal ◽  
Y. S. Ghanem ◽  
S. S. Khishin
Keyword(s):  
Genetic Parameters ◽  
Genetic Correlations ◽  
Research Station ◽  
Phenotypic Correlations ◽  
Arid Conditions ◽  
Body Weights ◽  
Genetic And Phenotypic Correlations ◽  
Fleece Weight ◽  
Semi Arid ◽  
Desert Research

SUMMARYRecords on 695 lambs were collected over a period of 5 years from 1961/62 to 1965/66, at Ras El-Hekma Desert Research Station, 230 km west of Alexandria. The characters studied were birth, weaning and yearling body weights, pre- and post-weaning daily gains and greasy fleece weight.Birth, 120-day and 365-day body weights were 3·4, 18·2 and 33·4 kg respectively. Greasy fleece weight at 16 months of age was 3·29 kg. Heritability estimates of birth, weaning, yearling weights, pre- and post-weaning daily gains and greasy fleece weight were 0·22, 0·45, 0·41,0·45 and 0·29 respectively. Genetic and phenotypic correlations between birth, weaning and yearling weights were all positive and significant. Genetic correlations between fleece weight and body characteristics were negative and low.

scholarly journals Comparative performance of Landrace, Yorkshire and Duroc breeds of swine

2017 ◽  
Vol 42 (3) ◽  
pp. 147
Author(s):  
C. K. N. Zebua ◽  
M. Muladno ◽  
P. H. Siagian
Keyword(s):  
Body Weight ◽  
Selection Index ◽  
Average Daily Gain ◽  
Least Square ◽  
Analysis Of Covariance ◽  
Economic Traits ◽  
Feed Conversion ◽  
Comparative Performance ◽  
Feeding Management ◽  
Randomized Design

The objectives of this study was to analyze the comparative ability of animal genetic, using evaluation of production that has important economic traits including Landrace, Yorkshire, and Duroc breeds of swine. A total of 49 swine consist 15 boars and 34 gilts, with average body weight of 18.50-21.50kg were used in this research. All of samples were raised in the same pen and feeding management. This research used the experimental method of Completely Randomized Design involving three treatments of animal breeds including Landrace, Yorkshire, and Duroc breeds. The data were analyzed by using analysis of covariance procedur General Linier Model and Least Square Means test. Boars and gilts were analyzed in separated data. The result showed that the effect of breed was significantly associated for all traits, but not for boars feed intake. The overall, Yorkshire and Landrace performed better than Duroc for average daily gain, feed conversion ratio, selection index, and age at 90 kg body weight. However, Duroc boars and gilts had the thinnest backfat followed by Yorkshire and Landrace.

scholarly journals EGG PRODUCTION CURVE OF RHODE ISLAND RED CHICKENS

2021 ◽  
Vol 28 (1) ◽  
pp. 78-83
Author(s):  
O. O. ONI ◽  
N. I. DIM ◽  
B. Y. ABUBAKAR ◽  
O. E. ASIRIBO
Keyword(s):  
Linear Regression ◽  
Mathematical Models ◽  
Rhode Island ◽  
Cycle Length ◽  
Egg Production ◽  
Goodness Of Fit ◽  
Production Data ◽  
Production Cycle ◽  
Breeder Hens ◽  
The Mean

Data on the monthly egg production of a strain of Rhode Island chickens (500 breeder hens) were used to test the goodness of fit of six mathematical models, viz; Exponential, Parabolic exponential, Wood's Gamma type and modified Gamma type by McNally, Inverse polynomial and Linear regression. Egg production was summarized for each hen into 28-d periods, starting from the day of firts egg. The hens were classified into different production cycle length based on the number of 28-d periods. The models were fitted to the mean results obtained for periods within groups of hens. The effect of cycle length on goodness of fit was also examined separately for the 'best' three models with highest R2 values. The egg production cycle (i.e. number of 28-d periods) varied from 9 to 15 periods. Similarly, the coefficients of determination (R2) varied from 0.16 to 0.95 from fitting the models to mean egg production data for groups of hens. The results suggest that thye 'best' three models that were chosen fitted 52 week laying records quite well, judging from their respective R2, which were higherf for McNally (0.95) and Parabolic exponential (0.93) than for wood (0.75). Based on the goodness of fit to 52-week production record, the McNally model gave the best results. However, its suitability in predicting full year production from part year record needs to be further investigated.

scholarly journals A production trial with layers of four hybrids under different environmental conditions in the Eastern Province of Saudi Arabia.

1971 ◽  
Vol 19 (4) ◽  
pp. 204-210
Author(s):  
H. Appelman ◽  
B.J. Bonhof
Keyword(s):  
Saudi Arabia ◽  
Rhode Island ◽  
New Hampshire ◽  
Egg Production ◽  
Live Weight ◽  
Egg Mass ◽  
White Leghorn ◽  
Eastern Province ◽  
Egg Weight ◽  
Food Consumed

161 Australorp X Rhode Island Red (RIR) X New Hampshire (NH) and 166 White Leghorn (WL) imported fowls were kept in insulated housing; 161 Australorp X RIR X NH, 166 WL, 154 RIR X WL and 148 RIR X NH X RIR fowls were kept in open houses. In the 6 groups resp., live weight at 126 days of age averaged 1602, 1227, 1578, 1234, 1397 and 1539 g, food consumption 4.02, 4.49, 4.03, 4.47, 4.25 and 4.17 kg/kg gain, overall laying percentage 56.6, 56.4, 52.5, 53.4, 55.0 and 37.5, egg production/hen 202, 201, 188, 191, 196 and 134, and egg weight 56.3, 56.3, 55.0, 55.8, 55.0 and 57.5 g. Egg mass averaged 1335, 1323, 1191, 1151, 1126 and 796 kg and food consumed/kg eggs produced 3.68, 3.53, 3.71, 3.25, 3.37 and 4.74 kg. Live weight at 16 mth of age averaged 2894, 2040, 2665, 1874, 2132 and 2517 g, and mortality 12.8, 11.1, 33.6, 43.5, 52.8 and 50.4%. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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