Article

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

ABSTRACT

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. "

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    • "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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    ABSTRACT: Growth rate is a fundamental parameter of an organism's life history and varies 30-fold across bird species. To explore how whole-organism growth rate and the metabolic rate of cultured muscle cells are connected, two lines of Japanese quail (Coturnix coturnix japonica), one that had been artificially selected for fast growth for over 60 generations and a control line were used to culture myoblasts. In line with previous work, myoblasts from the fast growth line had significantly higher rates of oxygen consumption, glycolytic flux, and higher mitochondrial volume than myoblasts from the control line, indicating that an increase in growth rate is associated with a concomitant increase in cellular metabolic rates and that mitochondrial density contributes to the differences in rates of metabolism between the lines. We reared chicks from two hybrid lines with reciprocal parental configurations for growth rate to explore the effect of maternally inherited mitochondrial DNA on rates of growth and metabolism. Growth rates of chicks, cellular basal oxygen consumption, glycolytic flux, and mitochondrial volume in myoblasts from chicks from both reciprocal crosses were intermediate to the fast and control lines. This indicates that genes in the nucleus have a strong influence on metabolic rates at the cellular level, compared with maternally inherited mitochondrial DNA.
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    • "There were significant differences for mean values of EW, SG, SI, LE and SW traits between both flocks and ages, whereas no significant differences were found for SR, SS and WE traits at 12 and 16 weeks of age. The average egg weight in this study was 12.76 g (Table 1), which was lower than the 13.40 g reported by Khaldari et al. (2010) and 13.25 g reported by Copur et al. (2010). On the other hand, this average value for EW is in agreement with those reported by Erensayin and Camci (2002), Sahin et al. (2002), Roshdy et al. (2010) and Lotfi et al. (2012) of between 12.00 and 12.75 and also higher than the 10.27–11.43 "
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