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Author: DUTTA, KONKONA × Start date: 2016 × Type: Thesis ×
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    ThesisItemOpen Access
    PERFORMANCE OF GROWING PIGS ON CORN BASED DIET SUPPLEMENTED WITH PHYTASE AND NON-PHYTATE PHOSPHORUS
    (Assam Agricultural University, Khanapara,Guwahati, 2017-07) DUTTA, KONKONA; Bhuyan, Robin
    An experiment was conducted to study the performance of growing pigs on corn based diet supplemented with phytase and non-phytate phosphorus with twenty four castrated crossbred (Hampshire×Assam local) pigs weaned at 42 days of age. The average initial body weight of the animals ranged from 14.84±1.19 to 15.12±1.13 kg. They were divided into four different groups of 6 animals each viz. T₁, T₂, T₃ and T₄ and allotted to four nutritional treatments following randomized block design. Pigs in each group were offered ad libitum grower ration containing 18.26% CP and 3.17 Mcal ME/kg diet by using conventional feed ingredients viz. maize, wheat bran, soya bean, and de-oiled groundnut cake as per BIS (2001) specification of nutrient requirements. All the 4 experimental diet were supplemented with 0.2% non-phytate phosphorus (NPP) in the form of dicalcium phosphate (DCP) along with different levels of phytase enzyme. T₁ ration was devoid of phytase enzyme where as T₂, T₃ and T₄ ration was supplemented with 250, 500 and 750 unit of phytase per kg diet, respectively. Feeding trial was conducted for 6 fortnights followed by 5 days of metabolism trial with 3 animals in each group. The addition of phytase enzyme increased feed consumption in all the experimental groups with the progress of age of the pigs with highest increased rate in phytase supplemented group @750 unit/kg diet. It was observed that there was significant effect (P<0.05) in the dry matter intake per 100 kg body weight and per kg W0.75. During the entire growth period, the average body weight and rate of mean daily gain was significantly higher (P<0.05) in T₄ group. The rate of mean daily gain was 355.04±7.72, 389.56±13.45, 425.95±17.43 and 470.12±11.63 g in T₁, T₂, T₃ and T₄ groups, respectively. The feed conversion efficiency improved in phytase supplemented group and was found to be significantly better (P<0.05) in T₄ amongst all the groups. There was significant difference among the groups in respect of digestibility of DM, OM, CP, CF, EE, NFE and total carbohydrate. When the availability of crude protein and digestible energy was calculated against the NRC requirement, it was observed that animals received 104.32, 126.15, 143.0 and 148.68 percent CP and 145.04, 150.83, 172.31 and 180.99 percent DE in T₁, T₂, T₃ and T₄ groups respectively. No significant effects (P>0.05) of phytase addition were observed on blood biochemical constituents like glucose, total protein, calcium, inorganic phosphorus, glutathione peroxidase and lipid peroxidase. Feed cost per kg gain was Rs. 112.45, Rs. 112.57, Rs. 114.85 and Rs. 108.95 for T₁, T₂, T₃ and T₄ group, respectively. It is concluded that supplementation of phytase @ 750 unit/kg feed along with 0.2% NPP in the form of DCP is advantageous for growing pigs in terms of growth and economic return.