The Effect of Different Photoperiods and Stocking Densities on Fattening Performance, Carcass and Some Stress Parameters in Broilers

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211 Effect of Photoperiods and Stocking Densities on Broilers INTRODUCTION High stocking densities and long lighting periods are two major environmental factors common to broiler production (1). The control of these factors at an optimum level not only increases commercial profitability, but also contributes to securing the supply of the human population with adequate food and animal protein. When determining stocking density, producers should take multiple factors into consideration, which include among others, the size of the broiler chickens, the area occupied by feeders and drinkers, the area of the pen the animals are raised in, animal welfare standards, animal nutrition, fattening performance and economic return (2). Despite its negative impact on the individual performance of bird’s high stocking density remains a primary preference of broiler producers and is still considered appealing in terms of profitability (3, 4). Although no consensus has been reached on the optimum stocking density, research conducted to date suggests a maximum body weight of 30 kg per square meter (5). It is known that as the stocking density increases the fattening performance varies, yet, previous studies have reported variable findings on the direction and strength of such effects (6). To exemplify, while some researchers have reported that The Effect of Different Photoperiods and Stocking Densities on Fattening Performance, Carcass and Some Stress Parameters in Broilers

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تاریخ انتشار 2014