사육밀도와 사료 단백질 수준이 저속 성장 육계(한협 3호)의 성장, 육질, 혈청 Corticosterone에 미치는 영향

초록

A total of 720 slow-growing Korean meat-type (Hanhyop 3) chicken were used to evaluate the effect of stocking densities and dietary protein levels on growth performance, meat quality, bone mineral composition, and serum corticosterone. Three (6.3, 9.5, and 12.6 birds/m2) stocking densities and two dietary protein levels (19% and 18%) were factorially (3×2) arranged for six treatments. Overall body weight gain (BWG) was highest (p<0.001) at the lowest stocking density (6.3 birds/m2). The feed intake (FI) of birds at the highest density (12.6 birds/m2) was lower than that of birds at the other densities, but resulted in better feed/gain (F/G). Among 18% protein groups, the overall FI of birds at 9.5 birds/m2 was higher than that at the lowest density; therefore, birds at 9.5 birds/m2 had poorer F/G than birds at the lowest density during days 61∼75. Difference in F/G among densities was only significant (p<0.05) during days 61∼75 but not significant (p>0.05) during days 41∼60. Although there were no significant differences (p>0.05) in BWG and F/G between 19% and 18% dietary protein levels, FI of the 18% protein diet was less (p<0.05) than that of the 19% diet. Although there was no difference (p>0.05) in meat TBARS values, meat color differed (p<0.05) with stocking density and dietary protein levels. There was no effect (p>0.05) of stocking density and dietary protein levels on bone mineral composition. Serum corticosterone concentration increased (p<0.05) with increasing stock density but was not affected (p>0.05) by dietary protein levels. This study indicated that a density of 12.6 birds/m2 is not recommended for slow-growing chickens. Between 19% and 18% dietary protein levels, 18% would be recommended for the Korean Hanhyop 3 chicken in the finishing stage.

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