Browsing by Author "Samarasinghe, K."

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    Effect of Black Cumin Seed Meal (Nigella Sativa) on Performance, Meat Quality and Intestinal Microflora of Broilers
    (Uva Wellassa University of Sri Lanka, 2019) Himali, S. M. C.; Chathurika, W. V. A. H.; Samarasinghe, K.; Boteju, W.T.N.
    The aim of this study was to evaluate the effects of black cumin seed meal (Nigella sativa) included diet on the performance, carcass characteristics and intestinal microbial population of broiler chicken. A total of 180 one-day-old broiler chicks (Cobb 500) were allocated to four dietary treatment groups with five replicates each of 9 chicks and reared for 42 days. Experimental diets were prepared by replacing maize with black cumin seed meal (BCSM) at the rate of 0% (control, C), 10% (T1), 15% (T2), and 20% (T3). The statistically analyzed data revealed that T1 diet increased (P<0.05) the body weight gain of broilers compared to T2, and T3 at day 42. Dietary BCSM did not have a significant effect on the dressing percentage of birds. Birds fed with 10% maize replacement with BCSM recorded the lowest (P <0.05) malondialdehyde (MDA) content (3.38 μmol/kg) for Thiobarbituriacid Reactive Substances assay in chicken meat at 7th day of storage and the highest (P <0.05) ceacal lactic acid bacteria population (1.56 log CFU/mL) than other treatments. Further, the present study indicated that 10% replacement of maize with BCSM in the broiler diet has beneficial effects on body weight gain, MDA value and caecal lactic acid bacteria population. Also, it showed a decreased tendency in coliform bacteria population in the caecal content. Moreover, it has significantly affected meat quality attributes where the highest (P <0.05) score (5.93) for taste resulted. In conclusion, replacing maize with up to 10% BSCM in the diets of broilers has positive effects on body weight gain, carcass characteristics and caecal microbial population.
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    Effect of the Flock Age and Eggs Storage Time On the Hatchability and Apparent Fertility of Broiler Grandparents Stock Eggs
    (Uva Wellassa University of Sri Lanka, 2010) Ekanayake, I.K.D.C.B.; Nambapana, N.M.N.; Jayasena, D.K.D.D.; Sathtarasinghe, D.A.; Samarasinghe, K.
    This research was conducted to determine the effects of flock age and storage time of eggs on the hatchability, apparent fertility, hatch of fertile and embryonic mortality of 30 to 59 weeks aged broiler grandparent eggs. The experiment was conducted with eggs from Cobb 500 broiler grandparent breeders from 30-39 weeks, 40-49 weeks and 50-59 weeks of age. For each age groups eggs were stored at 12-15 °C and storage time grouped as 1-8 days, 9-16 days and 17-24 days respectively. After the storage period, eggs of all the groups were incubated for 21 days in single stage incubator. After 21 days chicks were counted and the hatchability was determined. Unhatched eggs were broken to determine fertility, and if fertile, the stage of embryonic death was recorded. The results indicated that the storage period significantly affects the apparent fertility, hatchability, hatch of fertile, early dead, mid dead and late dead, total embryonic morality and contaminated eggs but not for pips (P<0.05). The best apparent fertility, hatchability and hatch of fertile (96.56±0.24, 87.28 ±0A5, 90.39±0.50) and lowest percentages early dead, mid dead and late dead (3.72±0.45, 1.00±0.17, 2.67±0.19) were obtained in 30-39 weeks flock age group. The Flock age significantly affects ( p < 0.05) on apparent 'fertility, hatchability, hatch of fertile, late dead and contaminated eggs but not on (P>0.05) early dead, mid dead, total embryonic morality and pips. Combined effect of Flock age x storage period did not have a significant effect (p > 0.05) on hatchability, apparent fertility, hatch of fertile and embryonic mortality. It is evident that, the eggs of 30-39 weeks flock age group stored within 1-8 days period had the highest hatchability (87.28 ±0.45) and the eggs of 50-59 weeks flock age group that stored within 17-24 days had the lowest hatchability (60.17 ± 1.51). The study shows that the eggs which were stored for a shorter period in the storage have given higher hatchability than the eggs stored for a prolonged period in the storage. Key words: Apparent fertility, Hatchability, Embryonic mortality, Flock age, Storage period
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    Waste Minimization of Poultry Feed Processing through Cleaner Production
    (Uva Wellassa University of Sri Lanka, 2010) Wijesekara, W.L.U.; Abeyrathne, E.D.N.S.; Ganegoda, G.A.P.; Samarasinghe, K.
    Cleaner Production (CP) need for a company to succeed in reducing cost, increase productivity, and minimize pollution and production waste. Cost of production can reduce through minimizing of waste in terms of material and energy. In the source of identification, waste and emission sources within the premises were identified. Employees involved in different sections were interviewed and waste process steps were identified. Process flow diagram was constructed as perquisite for source inventory. Each of the operation unit was studied carefully for identification of waste generation. Finally CP options were suggested to improve work practices and proper maintenance. CP options optimize existing processes.. High moisture losses recorded in rice polish (new crop) during storage (1.30 %) in ware souse storage. Due to different types of packing material approximately 11500 kg of waste were recorded. In the machinery operation trace line waste was high (16374.99 kg, 46.54 %). Losses were occurred even though product filling is automated. Filling of Broiler starter of 50 kg bags shows 0.04 % variance and filling of acco layer grower of 25 kg bags shows 0.045 `)/0 variance among the samples. By applying the cleaner production concepts to the poultry feed manufacturing process additional benefit can be gain through sale of waste packing material to recycler and also minimize the labour cost for waste management. Through CP can minimize waste generation due to raw material spoilage and moisture losses during silo storage through aeration process. Increase labour efficiency, dumping rate, maintain the storage condition of ware houses were the other achieved advantages of CP concept. Key words: Poultry feed, Cleaner production, Material balance, Moisture losses