University of Khartoum

Effect of Fogging Cooling System on Physiological and Performance Characteristics of Broiler Chicken in Tropic

Effect of Fogging Cooling System on Physiological and Performance Characteristics of Broiler Chicken in Tropic

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Title: Effect of Fogging Cooling System on Physiological and Performance Characteristics of Broiler Chicken in Tropic
Author: Aboush, Kamal Elddin Gafer Elbasheir
Abstract: This research study was initiated with the aim to improve the micro-environment inside traditional open sided broiler housing by using cost effective of fogging cooling system. Prior to the experiments, a field survey for the traditional small producers of broiler houses in the three areas of Khartoum state (Khartom, Khartoum north and Omdurman) was conducted and micro-environment measurements were done for ambient temperature and relative humidity. Other information gathered were birds’ feed consumption, body weights and mortality rates during dry, wet and winter seasons. Two experiments were started during the dry and wet summer seasons (27th April-8th June, 2015) and (7th August -19th September, 2015), respectively. The experiments conducted in open-sided poultry housing (20mx10mx3m) in the research station of animal production in Khartoum North (Hilat Kuku). Partitions were constructed inside the house to establish 5 chambers for the different treatments. The house provided with cooling unit contain water pump, water filter, regulator outside and water pipe with nozzles inside.Two water pipes were installed inside the house one on each side in a north-south direction. Fogging systems were designed a long each pipe where nozzles were installed in different numbers to provide four treatments T2, T3, T4 and T5. T2 has mist fogs from 4 nozzles (2 on each side), T3 5 nozzles (2 from one side and 3 from the opposite side). Birds in T4 received mist fogs from 6 nozzles (3 from each side) and birds within T5 received fogs mist from 7 nozzles (3 from one side and 4 from the opposite side), T1 is the control where the birds did not receive any cooling. A total of 1920 (Ross-308) birds were randomly allocated to the different treatments each consisted of 384 birds divided into two replicates (192 birds in each).During experimental period, parameters measurements included: house temperature (c°) and relative humidity(%), plus body core temperature(°C) were measured daily, and blood parameters (serum electrolytes responsible for osmolar concentration and acid-base balance (Na & K) and hormones responsible for metabolic rate (Thyroxin T4) or heat stress (cortisol). Weekly measurements included body weight, body weight gain, feed consumption, feed conversation ration and mortality rates (%). The parameters also included post-mortum data. Hot and cold carcass weights, dressing out (%), carcass peculiarities weights (thigh, breast, backbone wing, and neck weight), internal organs weights (gizzard, kidney, liver, heart and adipose).The collected data were analyzed by using complete randomized design. The results obtained showed that, house temperature and core body temperature was significantly (P≤0.01) elevated at the wet summer than dry summer season. However sodium concentration levels were significantly (P≤0.01) increased, while potassium concentration levels were significantly decreased in dry summer than wet summer season. The trends of physiological responses as thyroxin (T4) and cortisol secretion concentrations levels were similar to those sodium and potassium. Also broilers performance parameters rates included (body weight, body weight gain, feed consumption and, feed conversation ration and mortality rates) were significantly (P≤0.01) increased with increasing fogging cooling systems during the wet summer as compared with dry summer season. The cooling fogging systems showed improved broilers’ response compared with the control with significant (P≤0.01) progressive differences with advancement of birds age. T4 showed significant differences (P≤0.01) and best response for all parameters. However, the carcass peculiarities (thigh, breast, backbone wing, and neck weight) and internal organs (gizzard, kidney, liver, heart and adipose) were not consistent between treatments and the differences were not significant (P≥0.05). Generally, the wet season showed better (P≤0.01) responses than the dry season. This was related to the combination of ambient temperature and relative humidity which interacted to affect broilers’ heat dissipation mechanism and hence feed assimilation. The economical information included number of batches produced per year and profit gained. The economical analysis carried out for small scale producers to achieve marketable broiler meat, showed that adoption of such technology was cost-effective contributing to stable meat prices. It could be concluded that cooling fogging systems work well in hot environments and more effective in open-sided poultry house during wet summer season by reducing indoor temperature and improve broilers performance. (T4) increasing cooling system and seemed to be the best system to work under combined conditions of temperature and humidity inside the birds’ house during wet summer season. Further study was recommended for more scientific information is needed on the effect of fogging cooling system and season on broiler performance especially under tropical condition.
URI: http://khartoumspace.uofk.edu/123456789/25610


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