Abstract
The free-range broiler production is an effective combination of ecological and economic benefits. However, excessive stocking will inevitably lead to a variety of negative effects, such as the destruction of vegetation, the hardening and even acidification of soil. It is very important to determine the reasonable stocking density for free-range broiler. In this paper, the outdoor feeding density of free-range broiler in different stocking ecosystems based on the nitrogen cycling was proposed combination of theoretical derivation and investigation and research, and proved the correctness of the research idea and density parameters through empirical research, which provided the key technical parameters for scientific guidance of free range chicken production.
Highlights
The free-range broiler production has exceeded 30 percent of the total broiler production in China; it is an effective combination of ecological and economic benefits
Excessive stocking will inevitably lead to a variety of negative effects, such as the destruction of vegetation, the hardening and even acidification of soil
Problems with surface and ground water pollution can result from improper rates of chicken manure application to agricultural land [3]
Summary
The free-range broiler production has exceeded 30 percent of the total broiler production in China; it is an effective combination of ecological and economic benefits. Excessive stocking will inevitably lead to a variety of negative effects, such as the destruction of vegetation, the hardening and even acidification of soil. Kratz et al [4]analyzed the changes in soil nitrogen and phosphorus under different broiler production systems. The results showed that fecal nitrogen and phosphorus input leaded to accumulation of soil mineral nitrogen and phosphorus, and caused a fact that the soil nitrogen and phosphorus exceeded the upper limit defined in Germany for grassland or optimum plant yield as mentioned by Kratz et al[4]. In order to ensure the healthy growth of free-range Broiler and the stability of the ecosystem, it is very important to determine the reasonable stocking density. The stocking density of free-range broiler production in different ecosystems was proposed based on the study of nitrogen cycle
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