GROWTH PERFORMANCES OF SEXED COMMERCIAL BROILERS AT DIFFERENT DIETARY LEVELS OF PROTEIN
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Date
2016-12
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Assam Agricultural University, Khanapara,Guwahati
Abstract
Two hundred seventy numbers of 7 day-old commercial broiler chicks were randomly divided into 3 sexed groups of mixed sex (T1), male (T2) and female (T3) groups of 90 chicks each. Each sexed group was further divided into 3 dietary treatment groups of 30 chicks each viz. T1D1, T1D2, T1D3, T2D1, T2D2, T2D3, T3D1, T3D2 and T3D3. Experimental broilers under these nine treatment groups were offered ad libitum quantities of 3 isocaloric experimental diets containing 3 different levels of protein viz. high protein (D1), medium protein (D2) and low protein (D3) with broiler starter (CP 24.92%, 23.13% and 20.97%) broiler finisher (CP 21.79%, 19.87% and 18.15%) diets from 7 to 21 days and from 22 to 42 days of age respectively.
At the end of the 6th week, the mean total body weights were 1836, 1827, 1822, 1943, 1945, 1905, 1684, 1673, 1636g and the mean total weight gains were 1640, 1630, 1626, 1804, 1742, 1645, 1445, 1434 and 1400g for T1D1, T1D2, T1D3, T2D1, T2D2, T2D3, T3D1, T3D2 and T3D3 groups, respectively. The mean total feed intake were 3287, 3252, 3303, 3391, 3380, 3368, 3042, 3039 and 3029g and the average feed conversion ratios were 1.94, 1.93, 1.96, 1.89, 1.88, 1.91, 1.97, 1.99 and 2.03 for T1D1, T1D2, T1D3, T2D1, T2D2, T2D3, T3D1, T3D2 and T3D3 groups, respectively.
The percentage retention of nitrogen were 56.33, 60.95, 59.60, 61.78, 66.73, 64.73, 50.77, 56.85 and 54.97, calcium were 46.25, 50.83, 48.19, 51.78, 56.18, 54.85, 42.17, 56.85 and 45.14 and phosphorous were 46.02, 49.12, 47.26, 50.72, 54.91, 53.29, 41.26, 44.72 and 43.16 for T1D1, T1D2, T1D3, T2D1, T2D2, T2D3, T3D1, T3D2 and T3D3 groups, respectively.
The mean total dressed weight were 1584, 1580, 1489, 1763, 1748, 1661, 1429, 1403 and1208g, mean total dressing percentage were 71.09, 71.39, 70.76, 72.37, 72.21, 72.12, 71.15, 71.06 and 69.17% and mean total giblet weight were 122.6, 116.1, 103.2, 112.9, 127.1, 106.7, 104.6, 113.4 and 86.50 for T1D1, T1D2, T1D3, T2D1, T2D2, T2D3, T3D1, T3D2 and T3D3 groups, respectively. The mean weight of different cut parts were, neck (110.5, 105.5, 103, 117.5, 120, 112.2, 81.50, 78.50 and 69.0g), wing (183.5, 176.5, 164.0, 193.0, 222.5, 179.4, 160.5, 156.0 and 131.5g), breast (571.0, 564.0, 507.0, 583, 581.5, 538, 484.5, 499 and 437g), thigh (272.5, 276, 265, 314, 314.5, 303, 279.5, 254 and 215.5g), drumstick ( 222.5, 236.5, 227.5, 266.5, 251.5, 261.8, 211, 219 and 184g) and back (224, 221, 220.5, 288, 257.5, 266.4, 211.5, 196.5 and 171g) for T1D1, T1D2, T1D3, T2D1, T2D2, T2D3, T3D1, T3D2 and T3D3 groups respectively.
Overall mean serum total protein level were 6.24, 5.76, 5.39, 6.29, 5.86, 5.43, 6.13, 5.64 and 5.20 g/dl, serum albumin were 2.47, 2.59, 2.60, 2.45, 2.77, 2.61, 2.67, 2.62 and 2.39 g/dl and serum globulin were 3.77, 3.18, 2.79, 3.84, 3.09, 2.82, 3.46, 3.02 and 2.81 g/dl for T1D1, T1D2, T1D3, T2D1, T2D2, T2D3, T3D1, T3D2 and T3D3 groups respectively.
The body weights were found to be uniform in all the experimental treatment groups at a variation level of 10%. The mean broiler performance efficiency index were 94.74, 94.89, 92.93, 103.10, 103.70, 99.74, 85.10, 83.71 and 79.31 for T1D1, T1D2, T1D3, T2D1, T2D2, T2D3, T3D1, T3D2 and T3D3 groups respectively.
The average profit per bird were found to be Rs. 57.84, 66.39, 69.76, 65.44, 74.82, 76.74, 49.13, 55.97 and 57.35 and average profit per kg body weight were found to be Rs. 31.51, 36.36, 38.30, 33.69, 38.47, 40.25, 29.29, 33.60 and 35.21 for T1D1, T1D2, T1D3, T2D1, T2D2, T2D3, T3D1, T3D2 and T3D3 groups, respectively.
On the basis of broiler performance efficiency index and economics of production of the present study it may be concluded that male commercial broilers may be reared as single- sex group on diets containing protein levels as per BIS recommendations or even 2% lower to that.
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