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Range00:59

Range

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The range is one of the measures of variation. It can be defined as the difference between a dataset's highest and lowest values. For example, in the study of seven 16-ounce soda cans, the filled volume of soda was measured, thus producing the following amount (in ounces) of soda:
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In the field of psychology, there are several ways to organize measurements of a trait, feature, or characteristic (i.e., variables). Qualitative data, such as ethnicity, can be tabulated into a frequency count to provide information about the proportion, as well as the variety of groups in a sample or population. On the other hand, researchers can perform a wider set of calculations on quantitative data. The mean, mode, and median, for instance, are central tendency measures to identify a...
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Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
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Consider a scenario where a circular shaft is subject to torque that remains within the boundaries of Hooke's Law, avoiding any permanent deformation. So, the formula for shearing strain is revisited. This formula is multiplied by the modulus of rigidity, and then Hooke's Law for the shearing stress and strain is applied. As a result, the equation for shearing stress in a shaft can be derived.
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Ranging behavior relates to welfare indicators pre- and post-range access in commercial free-range broilers.

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Outdoor range access in summer positively impacts broiler chicken welfare, improving gait and plumage. However, ranging chickens had lower weights, suggesting a need for further research into the causal relationship.

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Area of Science:

  • Animal Science
  • Poultry Science
  • Animal Welfare

Background:

  • Limited understanding of outdoor range access effects on broiler chicken welfare.
  • Commercial broiler farms often provide outdoor access, but its welfare implications are understudied.

Purpose of the Study:

  • To investigate the impact of outdoor range access on broiler chicken welfare indicators.
  • To identify relationships between ranging behavior and welfare metrics in different seasons.

Main Methods:

  • Tracking individual ranging behavior of 538 chickens across 4 flocks (winter/summer).
  • Measuring welfare indicators (weight, gait, dermatitis, plumage) pre- and post-range access.
  • Conducting post-ranging autopsies to assess internal health (breast burn, leg health, ascites).

Main Results:

  • Summer flocks showed significantly higher range use (82.1%) than winter flocks (32.5%).
  • In summer, ranging chickens had lower pre- and post-range access weights compared to non-rangers.
  • Increased range use in summer correlated with improved gait scores, better plumage, and reduced ascites.

Conclusions:

  • Outdoor range access, particularly in summer, is associated with specific changes in broiler chicken welfare.
  • Ranging behavior in summer is linked to improved mobility and feather condition, but also lower body weight.
  • Further research is needed to establish causality between range access and observed welfare outcomes.