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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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肉用鷄에서 可食肉量을 效果으로 推定할수 있는 方法을 究明코자 White Cornish種과 S. C. W. Leghorn種, 그리고 이 두 品種의 相反交雜種을 各各 120首씩 計 480首를 供試하여 體重, 部位別 可食肉 및 體型의 變化, 이들 形質에 發現된 雜種强勢와+ 伴性遺傅效果 및 化學的 組成分含量을 調査하고, 成長段階別 可食肉量을 推定한 結果를 要約하면 다음과 같다.
1. W,. Cornish種의 8週時 體重 및 飼料要求率과 斃死率을 보면 各各 1,818±47.7g와 2.24 및 3.30%였고 S. C. W. Leghornw種에선 各各 667.8±28.9g와 3.28 및 2.50%였으며 雜種들의 能力은 이 두 품종의 中間程度로 正常發育을 하였다.
2. 體重에 있어서 鷄?間 差異는 2週齡부터 有意性이 인정되었고, 成長曲線의 回歸方程式에서 成長速度를 표시하는 回歸채係數를 보면 W. Cornish種(b_(CC)-1,578)은 S. C. W. Leghorn種 (b_(LL)-1,378)에 比해 有意的으로 크로 交雜種들은 이 두 品種의 中間값 (b_(LC)-1,476, b_(CL)-1,470)을 보인다.
可食肉量의 경우도 鷄種間 增加樣相이 除蟲의경우와 비슷하였으나 肉量增加의 回歸方程式에서 回歸係數의 크기가 (b_(LL)-1,563, b_(LC)-1,651, b_(CL)-1,636, b_(CC)-1,766) 體重에서 보다 컷는데 그 原因이 成長速度 差異때문인지를 究明하기 爲해 週齡 (log x) 과 體重에 對한 可食肉量比率 (log y) 間의 線型關係를 推定한 결과 各 鷄種의 回歸係數 (b_(LL)-0.184, b_(LC)-0.175, b_(CL)-0.165 및 b_(CC)-0.188) 는 모두 有意性 認定되어 可食肉의 增加速度는 體重의 增加速度보다 현저히 빠른 것으로 판명되었다.
3. 體重構成要素中 週齡經過에 따라 그 重量比率이 增加되는 것은 羽毛 腹腔脂肪, 胸部 및 腿脛部이고, 減少되는 것은 頭部 頸部. 可食內藏 및 不可食內藏이며 放血量, 脚部, 翼部 및 背部는 큰 變化를 보이지 않는다.
不可食部 全體重量比率은 週齡別로 볼때 S. C. W. Leghorn種은 0,4,8週齡에 各各 48.8%, 634.0% 및 32.8%이고 W. Cornsh 種은 같은 週齡에 49.9%, 32.0% 및 27.9%이며 雜種은 두 純宗의 中間값을 나타내 週齡增加에 따라 이들 部位는 重量 比率이 減少되고. 그 減少速度는 W. Cornsh種에서 현저히 빨랐다.
可食部位中 胸部重量比率은 S. C. W. Leghorn種에서 2,6,10週齡에 各各13.1% 15.7% 및 15.8%이고 W. Cornsh種에선 14.7%, 16.6% 및 18.6%였으며, 腿脛部重量比率은 같은 週齡에 S. C. W. Leghorn種에서 15..8%, 20.8% 및 21.6% 이고 W. Cornsh種에선 18.4%, 23.4% 및 14.4% 를 보여서 W. Cornsh種은 S. C. W. Leghorn 種에 比해 이들 部位의 重量比率이 클 뿐 아니라, 그의 成長速度도 빠르고, 또 胸部에 比해 腿脛部가 클 뿐 아니라 成長速度 또한 빨랐다.
胸部와 腿脛部의 産肉率은 2,6,10週齡時 W. Cornsh種에서 各各 86.3%, 88.5%, 89.1%와 81.9%, 85.2% 및 85.8%로 腿脛部보다 胸部에서 약간 높았고, 總産肉率도 週齡經過에 따라 增加하였으며 S. C. W. Leghorn種은 W. Cornsh種에 比해 産肉率이 約 程度 낮았다.
可食肉量比率과 其他 體重構成要素들의 重量比率間에 相關程度는 鷄種과 週齡에 따라 현저한 差異를 보였고, 腹腔脂肪量比率과 可食肉比率間에는 어느 경우에서도 相關度가 지극히 낮았다.
4. 調査된 體型構成要素 10個部位들의 크기는 대부분 2週齡부터 鷄種間에 有意差를 보였고, 推定된 이들 部位의 成長曲線의 回歸方程式은 대부분 R²-0.9 以上으로 正確度가 대단히 높았다. 그리고 可食肉量과 胸圍, 胸福, 胸長, 胸骨長, 腿脛部 들레, 脛骨長 및 脚長間의 相關係數들은 鷄種이나 週齡에 關係없이 높은 相關度를 보이고 있어 이들 體位 測定値로 可食肉量을 비교적 정확히 推定할 수 있을 것으로 判斷도었다.
5. 體位測定値에 의한 可食肉量推定의 最適 回歸方程式은 W. Cornsh種에서 6週齡은 Y=-863,802+1,671X+4,841X_(25)+5,586X₃₃+13,469X_(35) (R²=0.916), 8週齡은 Y=-128.5,850+5.136X₃₁+5,750X_(25)+1,824X₂₄+3,592X₃₃ (R²=0.931), 10週齡은 Y=-1491,307+6,649X_(26)+3,099X₂₄+3,363X_(25)+14,789X_(35) (R²=0.874) 이었고, S. C. W. Leghorn種의 6週齡은 Y=-166.437+2,717X₃₃+2,653X_(25)+5,942X_(35) (R²=0.93), 8週齡은Y+-288,856+4,062X₃₃+2,818X_(27) (R²=0.965), 10週齡은 Y=-347,407+4,549X₃₃+3.003X₃₁ (R²=0.897) 이었다. 위에서 X₂₄=胸圍, X_(25)=胸福, X_(26)=胸長, X_(27)=胸骨長 X₃₁=腿脛部둘레,X₃₃=脚長 , X_(35)=脚徑 이다.
6. 雜種强勢가 가장 크게 發現된 形質은 腹腔脂肪量比率이며, 可食肉量 (g), 不可食內臟量比率 및 體重 (g)의 順序인데 6,8,10週齡에 나타난 强勢의 程度 (Fm/Fm×100)는 腹腔脂肪量比率의 경우 各各 126.92%, 157.33%, 137.71%였고 可食肉量 (g)의 경우는 同週齡에 各各 93.01%, 86.36% 및 88.09% 였다.
7. 調査되 대부분의 形質에서 伴性遺傅效果는 有意性이 인정되지 않았으며, 따라서 相反交接種間의 差異는 母體效果等 他 要因에 의한 것으로 생각된다.
8. 鷄肉內 水分含率은 4週齡時 73.17%에서 8週齡에 71.99%로 감소되었고, 脂肪含率은 같은 時期에 6.34%에서 7.55%로 增加했으며, 蛋白質 含率도 19.37%에서 21.10%로 增加하였다. 成長이 빠른 W. Cornsh種은 S. C. W. Leghorn 種에 比해 水分은 약 1% 정도 많고, 脂肪은 0.5% 정도 높으며, 蛋白質含率은 反對로 1% 가량 낮았다.
A study was conducted to investigate the possibility of improving the effectiveness of the existing method(s) to estimate the edible meat weight in live broiler chicken. Four breeds of chicken, White Cornish broiler chicks (parent stock), Single Comb White Leghorn (SCWL) egg strain chicks (parent stock), and two reciprocal cross breds of these parent stocks were employed in this study. A total of 480 birds, 60 male and 60 female chicks for each breed, were used. Ten male and 10 female chicks from each breed were randomly sacrificed at 0, 2, 4, 6, 8 and 10 weeks of ages in order to measure the body weight, edible meat weight of breast and leg (thigh and drum-stick), various components of body weight and various body shape measurements. In addition, chemical analyses of edible meat were carried out. Results obtained from this sturd were summarized as follows.
1. The average body weights of White Cornish broiler chicks and SCWL egg strain chicks were 1.82±0.048 kg (X±S.E.) and 0.67± 0.029 kg, respectively, at 8 weeks of age. The feed to gain ratio for White Cornish and SCWL chicks were 2.24 and 3.28, respectively, for 0 to 8 weeks of age. The reciprocal cross bred chicks (White Cornish x SCWL) showed intermediate values in both parameters.
2. It was noticed that the White Cornish chicks grew significantly heavier than did the SCWL chicks from 2 weeks of age. The regression coefficients of growth curves from White Cornish broilers (b_(CC)) and SCWL egg strain chicks (b_(LL)) were 1.578 and 1.378, respectively. The reciprocal cross bred chicks were intermediate (b_(LC)=1.476 and b_(CL) =1.470) in this respect.
The growth curves of edible meat showed similar tendency to those of body weight, but their regression coefficients (b_(LC)=1.651 and b_(CL) =1.636) were somewhat larger than those of body weight. To assertain whether there is a real difference in growth rate between body weight and edible meat, logarithms were taken for both age (log x) and the percentage of edible me?at to body weight (log y). As a result, a third set of regression coefficient were obtained (b_(CC)=0.188, b_(LL) =0.184, b_(LC)=0.175 and b_(CL) =0.165). These b values were found to be significant, indicating that the growth rates of edible meat were faster than were those of body weight in all breeds tested.
3. Among the body weight components, the feather, abdominal fat, breast, and thigh and drumstick increased in their weight percentage as the birds grew older, while head, neck, giblets and inedible viscera decreased. No difference was apparent in blood, shank, wings and back. The total weight percentage of inedible parts for SCWL chicks were 48.8, 34.0 and 32.8% at 0, 4 and 8 weeks of age, respectively. The White Cornish broiler chicks showed faster decreasing rates (48.9%, 32.0% and 27.9%) in this respect than did SCWL egg strain chicks. Again, the values for reciprocal cross bred chicks were intermediate.
The weight percentages of breast in edible part for SCWL chicks were 13.1, 15.7 and 15.8% at 2, 6 and 10 weeks of age, respectively, compared to 14.7, 16.6 and 18.6% for White Cornish chicks. Similar trends were found with thigh and drum-stick. The SCWL chicks showed 15.8, 20.8 and 21.6% at 2, 6 and 10 weeks of age, and the values for White Cornish broilers were 18.4, 23.4 and 24.4%. These results indicated that broiler chicks were faster in growth rates of the edible parts than were egg strain chicks. Further more, broiler chicks were larger in weight percentage of breast, thigh and drum-stick than were egg strain chicks. The thigh and drum-stick grew faster than did breast and the weight percentages(%) of the former in edible part were larger than did those of the latter.
The values for the percentage meat yield from breast were 86.3, 88.5 and 89.1% at the age of 2, 6 and 10 weeks in White Cornish broiler chicks, respectively. For thigh and drum-stick, the values of 81.9, 85.2 and 85.8%were obtained at the same ages as above with the same breed. These data indicate that the percentage meat yield increase as the birds grow older. The SCWL chicks showed 2% lower values in meat yield than did White Cornish chicks.
There were marked differences among breeds and weekly ages in the degree of correlation between percentage of edible meat and each of the body weight components(%). The degree of correlation between abdominal fat(%) were extremely low at all times.
4. Significant differences among breeds were noticed from 2 weeks of age in the size of each of ten components of body weight. The regression coefficients from growth curves for these components were very high (R ≥ 0.09). The correlation coefficients between the edible meat weight and the chest girth, breast width, breast length, keel length, drumstick girth, tibiatarsus length and shank length were very high so that it seems possible to estimate the edible meat weight by the use of these parameters. There was no influence of either breed or age.
5. The optimum regression equations for the estimation of edible meat weight by body shape measurements for White Cornish broiler chicks at 6, 8 and 10 weeks of age were as follows:
y_(6wk)= -863.802+1.671X₂₄+4.841X_(25)+5.586X₃₃+13.469X_(35) (R²=0.916)
Y_(8wk)= -1285.850+5.316X₃₁+5.750X_(25)+1.824X₂₄+3.592X₃₃ (R₂=0.931)
Y_(10wk)= -1491.307+6.649X_(26)+3.099X₂₄+3.633X_(25)+14.789X_(35) (R² =0.874)
Regression equations obtained with SCWL egg strain chicks were as follows:
Y_(6wk)= -166.437+2.717X₃₃+2.653X_(25)+5.942X_(35) (R²=0.930)
Y_(8wk)= -288.856+4.062X₃₃+2.818X_(27) (R²=0.965)
Y_(10wk)= -347.407+4.549X₃₃+3.003X₃₁ (R²=0.897) (X₂₄, chest girth ;X_(25), breast width; X_(26), breast length; X_(27), keel length;X₃₁, drum-stick girth ;X₃₃, shank length;X_(35), shank diameter.)
6. The hybrid vigor was most strong in abdominal fat weight(%), and edible meat weight(g), inedible viscera(%) and body weight(g) in decreasing order. The degress of heterosis (Fm/pm x 100) of abdominal fat weight were 126.9, 157.3 and 137.7%, and those of edible meat weight(g) were 93.0, 86.4 and 88.1%, respectively, at 6, 8 and 10 weeks of ages.
7. The sex-linked effect was not significant in most parameters employed in this study. Thus, the difference among receiprocal cross breds might be due to the other factors, including the maternal ones.
8. The moisture content of edible meat was 73.17% at 4 weeks of age. This value decreased to 71.99% at 8 weeks of age. In contrast, the fat content increased from 6.34% to 7.5°5%, and protein content increased from 19.39% to 21.10% at the same period. The edible meat of the fast-growing White Cornish broiler chicks contained 1% more moisture, 0.5% more fat and 1% less protein than did that of slow-growing SCWL egg strain chicks.
1. W,. Cornish種의 8週時 體重 및 飼料要求率과 斃死率을 보면 各各 1,818±47.7g와 2.24 및 3.30%였고 S. C. W. Leghornw種에선 各各 667.8±28.9g와 3.28 및 2.50%였으며 雜種들의 能力은 이 두 품종의 中間程度로 正常發育을 하였다.
2. 體重에 있어서 鷄?間 差異는 2週齡부터 有意性이 인정되었고, 成長曲線의 回歸方程式에서 成長速度를 표시하는 回歸채係數를 보면 W. Cornish種(b_(CC)-1,578)은 S. C. W. Leghorn種 (b_(LL)-1,378)에 比해 有意的으로 크로 交雜種들은 이 두 品種의 中間값 (b_(LC)-1,476, b_(CL)-1,470)을 보인다.
可食肉量의 경우도 鷄種間 增加樣相이 除蟲의경우와 비슷하였으나 肉量增加의 回歸方程式에서 回歸係數의 크기가 (b_(LL)-1,563, b_(LC)-1,651, b_(CL)-1,636, b_(CC)-1,766) 體重에서 보다 컷는데 그 原因이 成長速度 差異때문인지를 究明하기 爲해 週齡 (log x) 과 體重에 對한 可食肉量比率 (log y) 間의 線型關係를 推定한 결과 各 鷄種의 回歸係數 (b_(LL)-0.184, b_(LC)-0.175, b_(CL)-0.165 및 b_(CC)-0.188) 는 모두 有意性 認定되어 可食肉의 增加速度는 體重의 增加速度보다 현저히 빠른 것으로 판명되었다.
3. 體重構成要素中 週齡經過에 따라 그 重量比率이 增加되는 것은 羽毛 腹腔脂肪, 胸部 및 腿脛部이고, 減少되는 것은 頭部 頸部. 可食內藏 및 不可食內藏이며 放血量, 脚部, 翼部 및 背部는 큰 變化를 보이지 않는다.
不可食部 全體重量比率은 週齡別로 볼때 S. C. W. Leghorn種은 0,4,8週齡에 各各 48.8%, 634.0% 및 32.8%이고 W. Cornsh 種은 같은 週齡에 49.9%, 32.0% 및 27.9%이며 雜種은 두 純宗의 中間값을 나타내 週齡增加에 따라 이들 部位는 重量 比率이 減少되고. 그 減少速度는 W. Cornsh種에서 현저히 빨랐다.
可食部位中 胸部重量比率은 S. C. W. Leghorn種에서 2,6,10週齡에 各各13.1% 15.7% 및 15.8%이고 W. Cornsh種에선 14.7%, 16.6% 및 18.6%였으며, 腿脛部重量比率은 같은 週齡에 S. C. W. Leghorn種에서 15..8%, 20.8% 및 21.6% 이고 W. Cornsh種에선 18.4%, 23.4% 및 14.4% 를 보여서 W. Cornsh種은 S. C. W. Leghorn 種에 比해 이들 部位의 重量比率이 클 뿐 아니라, 그의 成長速度도 빠르고, 또 胸部에 比해 腿脛部가 클 뿐 아니라 成長速度 또한 빨랐다.
胸部와 腿脛部의 産肉率은 2,6,10週齡時 W. Cornsh種에서 各各 86.3%, 88.5%, 89.1%와 81.9%, 85.2% 및 85.8%로 腿脛部보다 胸部에서 약간 높았고, 總産肉率도 週齡經過에 따라 增加하였으며 S. C. W. Leghorn種은 W. Cornsh種에 比해 産肉率이 約 程度 낮았다.
可食肉量比率과 其他 體重構成要素들의 重量比率間에 相關程度는 鷄種과 週齡에 따라 현저한 差異를 보였고, 腹腔脂肪量比率과 可食肉比率間에는 어느 경우에서도 相關度가 지극히 낮았다.
4. 調査된 體型構成要素 10個部位들의 크기는 대부분 2週齡부터 鷄種間에 有意差를 보였고, 推定된 이들 部位의 成長曲線의 回歸方程式은 대부분 R²-0.9 以上으로 正確度가 대단히 높았다. 그리고 可食肉量과 胸圍, 胸福, 胸長, 胸骨長, 腿脛部 들레, 脛骨長 및 脚長間의 相關係數들은 鷄種이나 週齡에 關係없이 높은 相關度를 보이고 있어 이들 體位 測定値로 可食肉量을 비교적 정확히 推定할 수 있을 것으로 判斷도었다.
5. 體位測定値에 의한 可食肉量推定의 最適 回歸方程式은 W. Cornsh種에서 6週齡은 Y=-863,802+1,671X+4,841X_(25)+5,586X₃₃+13,469X_(35) (R²=0.916), 8週齡은 Y=-128.5,850+5.136X₃₁+5,750X_(25)+1,824X₂₄+3,592X₃₃ (R²=0.931), 10週齡은 Y=-1491,307+6,649X_(26)+3,099X₂₄+3,363X_(25)+14,789X_(35) (R²=0.874) 이었고, S. C. W. Leghorn種의 6週齡은 Y=-166.437+2,717X₃₃+2,653X_(25)+5,942X_(35) (R²=0.93), 8週齡은Y+-288,856+4,062X₃₃+2,818X_(27) (R²=0.965), 10週齡은 Y=-347,407+4,549X₃₃+3.003X₃₁ (R²=0.897) 이었다. 위에서 X₂₄=胸圍, X_(25)=胸福, X_(26)=胸長, X_(27)=胸骨長 X₃₁=腿脛部둘레,X₃₃=脚長 , X_(35)=脚徑 이다.
6. 雜種强勢가 가장 크게 發現된 形質은 腹腔脂肪量比率이며, 可食肉量 (g), 不可食內臟量比率 및 體重 (g)의 順序인데 6,8,10週齡에 나타난 强勢의 程度 (Fm/Fm×100)는 腹腔脂肪量比率의 경우 各各 126.92%, 157.33%, 137.71%였고 可食肉量 (g)의 경우는 同週齡에 各各 93.01%, 86.36% 및 88.09% 였다.
7. 調査되 대부분의 形質에서 伴性遺傅效果는 有意性이 인정되지 않았으며, 따라서 相反交接種間의 差異는 母體效果等 他 要因에 의한 것으로 생각된다.
8. 鷄肉內 水分含率은 4週齡時 73.17%에서 8週齡에 71.99%로 감소되었고, 脂肪含率은 같은 時期에 6.34%에서 7.55%로 增加했으며, 蛋白質 含率도 19.37%에서 21.10%로 增加하였다. 成長이 빠른 W. Cornsh種은 S. C. W. Leghorn 種에 比해 水分은 약 1% 정도 많고, 脂肪은 0.5% 정도 높으며, 蛋白質含率은 反對로 1% 가량 낮았다.
A study was conducted to investigate the possibility of improving the effectiveness of the existing method(s) to estimate the edible meat weight in live broiler chicken. Four breeds of chicken, White Cornish broiler chicks (parent stock), Single Comb White Leghorn (SCWL) egg strain chicks (parent stock), and two reciprocal cross breds of these parent stocks were employed in this study. A total of 480 birds, 60 male and 60 female chicks for each breed, were used. Ten male and 10 female chicks from each breed were randomly sacrificed at 0, 2, 4, 6, 8 and 10 weeks of ages in order to measure the body weight, edible meat weight of breast and leg (thigh and drum-stick), various components of body weight and various body shape measurements. In addition, chemical analyses of edible meat were carried out. Results obtained from this sturd were summarized as follows.
1. The average body weights of White Cornish broiler chicks and SCWL egg strain chicks were 1.82±0.048 kg (X±S.E.) and 0.67± 0.029 kg, respectively, at 8 weeks of age. The feed to gain ratio for White Cornish and SCWL chicks were 2.24 and 3.28, respectively, for 0 to 8 weeks of age. The reciprocal cross bred chicks (White Cornish x SCWL) showed intermediate values in both parameters.
2. It was noticed that the White Cornish chicks grew significantly heavier than did the SCWL chicks from 2 weeks of age. The regression coefficients of growth curves from White Cornish broilers (b_(CC)) and SCWL egg strain chicks (b_(LL)) were 1.578 and 1.378, respectively. The reciprocal cross bred chicks were intermediate (b_(LC)=1.476 and b_(CL) =1.470) in this respect.
The growth curves of edible meat showed similar tendency to those of body weight, but their regression coefficients (b_(LC)=1.651 and b_(CL) =1.636) were somewhat larger than those of body weight. To assertain whether there is a real difference in growth rate between body weight and edible meat, logarithms were taken for both age (log x) and the percentage of edible me?at to body weight (log y). As a result, a third set of regression coefficient were obtained (b_(CC)=0.188, b_(LL) =0.184, b_(LC)=0.175 and b_(CL) =0.165). These b values were found to be significant, indicating that the growth rates of edible meat were faster than were those of body weight in all breeds tested.
3. Among the body weight components, the feather, abdominal fat, breast, and thigh and drumstick increased in their weight percentage as the birds grew older, while head, neck, giblets and inedible viscera decreased. No difference was apparent in blood, shank, wings and back. The total weight percentage of inedible parts for SCWL chicks were 48.8, 34.0 and 32.8% at 0, 4 and 8 weeks of age, respectively. The White Cornish broiler chicks showed faster decreasing rates (48.9%, 32.0% and 27.9%) in this respect than did SCWL egg strain chicks. Again, the values for reciprocal cross bred chicks were intermediate.
The weight percentages of breast in edible part for SCWL chicks were 13.1, 15.7 and 15.8% at 2, 6 and 10 weeks of age, respectively, compared to 14.7, 16.6 and 18.6% for White Cornish chicks. Similar trends were found with thigh and drum-stick. The SCWL chicks showed 15.8, 20.8 and 21.6% at 2, 6 and 10 weeks of age, and the values for White Cornish broilers were 18.4, 23.4 and 24.4%. These results indicated that broiler chicks were faster in growth rates of the edible parts than were egg strain chicks. Further more, broiler chicks were larger in weight percentage of breast, thigh and drum-stick than were egg strain chicks. The thigh and drum-stick grew faster than did breast and the weight percentages(%) of the former in edible part were larger than did those of the latter.
The values for the percentage meat yield from breast were 86.3, 88.5 and 89.1% at the age of 2, 6 and 10 weeks in White Cornish broiler chicks, respectively. For thigh and drum-stick, the values of 81.9, 85.2 and 85.8%were obtained at the same ages as above with the same breed. These data indicate that the percentage meat yield increase as the birds grow older. The SCWL chicks showed 2% lower values in meat yield than did White Cornish chicks.
There were marked differences among breeds and weekly ages in the degree of correlation between percentage of edible meat and each of the body weight components(%). The degree of correlation between abdominal fat(%) were extremely low at all times.
4. Significant differences among breeds were noticed from 2 weeks of age in the size of each of ten components of body weight. The regression coefficients from growth curves for these components were very high (R ≥ 0.09). The correlation coefficients between the edible meat weight and the chest girth, breast width, breast length, keel length, drumstick girth, tibiatarsus length and shank length were very high so that it seems possible to estimate the edible meat weight by the use of these parameters. There was no influence of either breed or age.
5. The optimum regression equations for the estimation of edible meat weight by body shape measurements for White Cornish broiler chicks at 6, 8 and 10 weeks of age were as follows:
y_(6wk)= -863.802+1.671X₂₄+4.841X_(25)+5.586X₃₃+13.469X_(35) (R²=0.916)
Y_(8wk)= -1285.850+5.316X₃₁+5.750X_(25)+1.824X₂₄+3.592X₃₃ (R₂=0.931)
Y_(10wk)= -1491.307+6.649X_(26)+3.099X₂₄+3.633X_(25)+14.789X_(35) (R² =0.874)
Regression equations obtained with SCWL egg strain chicks were as follows:
Y_(6wk)= -166.437+2.717X₃₃+2.653X_(25)+5.942X_(35) (R²=0.930)
Y_(8wk)= -288.856+4.062X₃₃+2.818X_(27) (R²=0.965)
Y_(10wk)= -347.407+4.549X₃₃+3.003X₃₁ (R²=0.897) (X₂₄, chest girth ;X_(25), breast width; X_(26), breast length; X_(27), keel length;X₃₁, drum-stick girth ;X₃₃, shank length;X_(35), shank diameter.)
6. The hybrid vigor was most strong in abdominal fat weight(%), and edible meat weight(g), inedible viscera(%) and body weight(g) in decreasing order. The degress of heterosis (Fm/pm x 100) of abdominal fat weight were 126.9, 157.3 and 137.7%, and those of edible meat weight(g) were 93.0, 86.4 and 88.1%, respectively, at 6, 8 and 10 weeks of ages.
7. The sex-linked effect was not significant in most parameters employed in this study. Thus, the difference among receiprocal cross breds might be due to the other factors, including the maternal ones.
8. The moisture content of edible meat was 73.17% at 4 weeks of age. This value decreased to 71.99% at 8 weeks of age. In contrast, the fat content increased from 6.34% to 7.5°5%, and protein content increased from 19.39% to 21.10% at the same period. The edible meat of the fast-growing White Cornish broiler chicks contained 1% more moisture, 0.5% more fat and 1% less protein than did that of slow-growing SCWL egg strain chicks.
목차
SUMMARY
Ⅰ. 緖論
Ⅱ. 材料 및 方法
Ⅲ. 試驗結果 및 考察
Ⅳ. 摘要
Ⅴ. 參考文獻
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