Effects of different levels of protein, energy and their interaction on growth factors of Indian shrimp (Fenneropenaeus indicus) of different sizes

Three experiments of ۲۸ days duration were conducted in three size groups (<۱g, ۱-۵g and ۵-۱۰g) of Indian white shrimp, Fenneropenaeus indicus, to evaluate the appropriate protein: energy (GE) ratios in their diets. A common ingredient mixture consisting of fish meal, shrimp meal, ground nut oil cake, cholesterol, lecithin, vitamins and minerals blended with chicken egg albumin, tapioca flour and cellulose (filler) to formulate nine feeds with protein levels of ۳۵%, ۴۰% and ۴۵% and GE levels of ۳۸۰, ۴۲۰ and ۴۶۰ kcal/۱۰۰g at each level of protein (i.e:۳۵:۳۸۰, ۳۵:۴۲۰, ۳۵:۴۶۰; ۴۰:۳۸۰, ۴۰:۴۲۰, ۴۰:۴۶۰ and ۴۵:۳۸۰, ۴۵:۴۲۰ and ۴۵:۴۶۰). Nutritional responses in terms of weight gain (g/individual), RGR, FCR, FCE, PER and PPV indicated that the protein: GE combination of ۴۵:۴۶۰ to be best in samples of  £lg size. Since weight increases were progressive, without indicating an optimum in this group of animals, protein levels beyond ۴۵% needs to be explored.  In the size group of ۱-۵g the protein: GE combination of ۴۰:۴۲۰ was found to be appropriate, indicating a decline in the requirement of protein and energy as growth progresses. In the size group of ۵-۱۰g, a further decline in the protein: GE combination was observed with the protein: GE combination of ۳۵:۳۸۰ performing the best among the levels tested. In this size group a protein level lower than ۳۵% has to be investigated. The findings reported are discussed in the light of relevant reports. 

کلیدواژه ها:

Fenneropenaeus indicus ، Protein ، Energy ration ، Growth performances ، Nutritional response