Effect of Crude protein and Metabolizable energy Levels on Growth Performance and carcass Quality of Crossbred Native Chicken (Pradu Hangdum) Capons
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Abstract
The objective of the present research is to evaluate the effect of different levels of crude protein (CP) and metabolizable energy (ME) on the growth performance and meat quality of Crossbred Native Chicken (Pradu Hangdum). A total of 360 capons with 4 weeks of age were used in 2 x 2 factorial design arrangements. This experiment was divided into 3 age periods: during 5-12, 13-16, and 17-20 weeks of age. During 5-12 weeks of age, there are two main factors: 2 CP levels (19 and 21%) and 2 ME levels (3.0 and 3.3 Kcal/g). During 13-16 and 17-20 weeks of age, there are two main factors: 2 CP levels (17 and 19%) and 2 ME levels (3.0 and 3.3 Kcal/g). A results, during 5-12 and 13-16 weeks of age, there was no interaction between CP and ME levels on growth performance. However, during 17-20 weeks of age, body weight gain (273.02 vs. 471.17 g; P<0.05) and average daily gain (9.75 vs. 14.89 g; P<0.05) were greater and feed conversion ratio (7.63 vs. 4.70; P<0.05) and feed cost per gain (110.70 vs. 71.59 Baht/Kg; P<0.05) were lower in capons receiving diet with 3.3 Kcal ME/g than diet with 3.0 Kcal ME/g. Meat quality of capons 16 weeks, CP 21%, (5-12 weeks) and CP 19%, (13-16 weeks), and with ME 3.0 Kcal/g had the lowest shear force of breast meat (4,018.69 N) and thigh meat of 20 weeks, the low ME group had shear force lower than significantly the high ME group (1,539.28 vs. 1,725.77 N; P<0.05). Ether extract of capons 20 weeks of age, 5-12 weeks of CP 19%, and 13-20 weeks of CP 17% ME 3.3 Kcal/g had breast meat fat to excellent (5.06%; P < 0.05). Capons slaughtered 12 and 20 weeks of age, CP19% (5-12 weeks) and CP 17% (13-20 weeks) and with ME 3.0 Kcal/g had the highest amount of thigh meat fat (17.32% and 19.99%; P< 0.05). Experimental study recommended nutrients of native hybrid capons age of 5-12 weeks, CP 21% and 3.30 kcal ME/g, at the age of 13-20 weeks, CP 17% and ME 3.0 kcal ME/g. Recommended to slaughter at the age of 20 weeks because of the highest fat in meat.
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King Mongkut's Agricultural Journal
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