Response to selection and genetic parameters of body and carcass weights in Japanese quail selected for 4-week body weight

Department of Animal Science, Faculty of Agriculture, University of Tehran, PO Box 4111, 31587-77871 Karaj, Iran.
Poultry Science (Impact Factor: 1.67). 09/2010; 89(9):1834-41. DOI: 10.3382/ps.2010-00725
Source: PubMed


The current study was conducted to investigate the effect of short-term selection in Japanese quail for 4-wk BW and estimate genetic parameters of BW, carcass traits, and egg weight. A selected line and control line were randomly selected from a base population. In each generation, 39 sires and 78 dams were used as parents for the next generation. Data were collected over 2 consecutive hatches for 4 generations, and 1,554 records from 151 sires and 285 dams were used to estimate the genetic parameters. The genetic improvement of 4-wk BW was 9.6, 8.8, and 8.2 g in generations 2, 3, and 4, respectively. There was a significant effect of sex, generation, and line (P < 0.001). There was a significant difference for BW and carcass weights but not for carcass percentage components between sexes (P < 0.01). Females showed higher figures than males. The realized heritability for 4-wk BW was 0.55, reflecting the accuracy of selection. However the estimated heritability by using pedigree information was 0.26 +/- 0.05. The genetic correlation among BW and carcass traits was relatively high (ranging from 0.85 to 0.91). Inbreeding caused a decline in the mean for all of the traits, but its effect was only significant for 4-wk BW and carcass weight (P < 0.05). Selection for 4-wk BW improved feed conversion ratio 0.16 units over the selection period. Results showed there was a strong genetic correlation between 4-wk BW and carcass traits that suggests that early 4-wk BW can be used as a selection criterion to improve carcass traits. Also, intense selection resulting in high rates of inbreeding might result in decreased response to selection due to inbreeding depression.

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Available from: Ardeshir Nejati Javaremi, May 08, 2014
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    • "In the next generation, 30 birds more were introduced (unknown parents) into the population. These birds had then been selected for 4 wk body weight (Khaldari et al. 2010). The number of male and female birds and contributing founders in each generation are presented in Table 1. "
    • "Japanese quail (Coturnix coturnix japonica) were reared by the Department of Poultry Science at the University of Arkansas. The F line was selected for post-hatch growth rate for over 60 generations and C line, was not selected for any trait, but was kept in similar conditions to the F line (Ricklefs and Marks 1985; Anthony et al. 1986; Khaldari et al. 2010). The F line reached a body mass of 271.7 g at the age of 4 weeks, more than double the C line at 127.5 g for the same growth period, and had a growth rate constant (K) of 0.096, compared with a K of 0.075 for the C line (Ricklefs and Marks 1985). "
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    • "Improved FCR (2.30) in generation 2 as compared to generation 0 (2.35) might be attributed to birds having higher body weight in adjustment to increased feed intake in progressive generations which resulted in improved FCR. Similarly in another study (Khaldari et al., 2010 "
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    ABSTRACT: The present experiment was planned to study the effect of selection for higher three week body weight on overall growth performance in Japanese quail for three generations. Initially a total of 11000 quail chicks were procured from the hatchery of ART Centre and randomly divided into 22 groups with equal number of chicks in each. At the age of 21 days birds were weighed individually and the birds (male and female) with the highest body weight were selected to be the parents of next generation. Out of these 22 groups, 20 groups were subjected to mass selection. In one group (group #21) selection was performed with full pedigree records. In group 22nd, birds were picked up randomly to be the parents of next generation without performing selection. The same procedure was repeated for all the three generations. The data on each flock in each generation were recorded regarding different parameters directly or indirectly linked with growth performance. The data were subjected to Analysis of Variance (ANOVA) in Completely Randomized Design (CRD) under factorial arrangements using GLM (General Linear Model) procedures with the help of SAS, 9.1. and the comparison of means using Duncan's Multiple Range (DMR) test depicted significant improvement in feed intake (g), body weight (g), body weight gain (g), FCR, Caloric and Protein intake / g body weight gain and decreased mortality in groups subjected to selection either mass or pedigree based while leg abnormality revealed non-significant differences in all the three groups.
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