Divergent Selection for Body Weight and Yolk Precursor in Coturnix coturnix japonica

Abstract

From a randombred control population of Coturnix coturnix japonica, four strains were selected respectively for high and low 4-week body weight and high and low total plasma phosphorus (plasma yolk precursor). Based on seven generations of selection, die realized heritabilities plus or minus their standard errors for high and low body weight strains were .37 ± .05 and .44 ± .28, respectively. The total gain and gain per generation were greatest in the low weight strain, primarily due to greater selection differentials.Selection for plasma yolk precursor was more effective in the high than low strain. The respective realized heritabilities plus or minus standard errors were .32 ± .02 and .34 ± .03. The selection differentials were larger in the high strain than in die low strain. There was no significant change in plasma yolk precursor in the weight strains nor in 4-week body weight in die plasma yolk precursor strains, which indicated that the genetic correlation between body weight during the growing period and plasma yolk precursor during the laying period was close to zero. (

Body weights, carcase characteristics, organ weights, abdominal fat, and lipid content of liver and carcase in two lines of Japanese quail (Coturnix coturnix japonica), unselected and selected for four week body weight

“…Selection studies with Japanese quails have shown that body weight can be increased (Marks, 1978£;Nestor et al, 1982, Oguz, 1994. In chickens male birds are heavier than the females.…”

“…Japanese quails have shown a marked response to selection for increased body weight (Marks, 1978 a;Nestor et al, 1982). Marks (1978 b) reported that selection for increased 4-week body weight in Japanese quail resulted in changes in the growth curve.…”

Muscle fiber characteristics of pectoralis major muscle as related to muscle mass in different Japanese quail lines

“…The heavy weight (HW) quail has been developed by selection for 4-week body weight (BW) from the random -E-mail: lee.2626@osu.edu bred control (RBC) quail for over 40 generations (Nestor et al, 1982 and2002). The body and pectoralis muscle weights of HW quail have been shown to be more than twice that of the RBC quail (Nestor et al, 2002), which is accompanied by a higher amount of total DNA mass and increased fiber sizes (Choi et al, 2013b).…”

Herdabilidade de características de produção e postura em matrizes de codornas de corte

“…Nota-se, também, que muitos dos trabalhos encontrados na literatura (STRONG et al, 1978;NESTOR et al, 1982;BAUMGARTNER, 1994), com relação à estimação de parâmetros genéticos em codornas, são baseados em metodologias utilizadas nas décadas de 60 e 70, que forneciam estimativas viesadas, tais como o método dos mínimos quadrados. Atualmente, com o avanço tecnológico, é possível obter estimativas mais acuradas, por meio de modelo animal, e se estimar parâmetros genéticos por meio de máxima verossimilhança restrita, além de, consequentemente, se obter predições mais confiáveis.…”