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Variance component analysis of growth and production traits in Vanaraja male line chickens using animal model

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Title Variance component analysis of growth and production traits in Vanaraja male line chickens using animal model
Not Available
 
Creator Rajkumar Ullengala, L. Leslie Leo Prince, Chandan Paswan, Santosh Haunshi, and Rudranath Chatterjee
 
Subject Animal Model; Restricted Maximum Likelihood (REML); Variance; Genetic Parameters; Economic Traits
 
Description Not Available
Objective: A comprehensive study was conducted to study the effects of partition of variance
on accuracy of genetic parameters and genetic trends of economic traits in Vanaraja male
line/project directorate-1 (PD-1) chicken.
Methods: Variance component analysis utilizing restricted maximum likelihood animal
model was carried out with five generations data to delineate the population status, direct
additive, maternal genetic, permanent environmental effects, besides genetic trends and
performance of economic traits in PD-1 chickens. Genetic trend was estimated by regression
of the estimated average breeding values (BV) on generations.
Results: The body weight (BW) and shank length (SL) varied significantly (p≤0.01) among
the generations, hatches and sexes. The least squares mean of SL at six weeks, the primary
trait was 77.44±0.05 mm. All the production traits, viz., BWs, age at sexual maturity, egg
production (EP) and egg weight were significantly influenced by generation. Model four
with additive, maternal permanent environmental and residual effects was the best model
for juvenile growth traits, except for zero-day BW. The heritability estimates for BW and SL
at six weeks (SL6) were 0.20±0.03 and 0.17±0.03, respectively. The BV of SL6 in the population
increased linearly from 0.03 to 3.62 mm due to selection. Genetic trend was significant
(p≤0.05) for SL6, BW6, and production traits. The average genetic gain of EP40 for each
generation was significant (p≤0.05) with an average increase of 0.38 eggs per generation.
The average inbreeding coefficient was 0.02 in PD-1 line.
Conclusion: The population was in ideal condition with negligible inbreeding and the
selection was quite effective with significant genetic gains in each generation for the primary
trait of selection. The animal model minimized the over-estimation of genetic parameters
and improved the accuracy of the BV, thus enabling the breeder to select a suitable breeding
strategy for genetic improvement.
Not Available
 
Date 2021-03-25T09:11:49Z
2021-03-25T09:11:49Z
2021-04-01
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/46264
 
Language English
 
Relation Not Available;
 
Publisher Asian-Australasian Association of Animal Production Societies (AAAP)