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Robbers Cave

Robbers Cave

During the 1950s, the landmark Robbers Cave experiment demonstrated that when groups must compete with one another, intergroup conflict, hostility, and even violence may result. At the Oklahoman summer camp, two troops of boys—termed the Rattlers and the Eagles—took part in a week-long tournament. During this time, their negativity culminated in derogatory name-calling, fistfights, and even vandalism and destruction of property. However, this work also revealed that such tension could be...

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Updated: Jul 3, 2026

Noninvasive, In-pen Approach Test for Laboratory-housed Pigs

Noninvasive, In-pen Approach Test for Laboratory-housed Pigs

Published on: June 5, 2019

An update on North American boar stud practices.

R Knox¹, D Levis, T Safranski

¹University of Illinois, Department of Animal Science, Urbana, IL 61801-3939, USA. rknox@uiuc.edu

|July 29, 2008

Summary

This summary is machine-generated.

This survey of 44 boar studs reveals common housing, feeding, and semen collection practices. Key culling reasons include genetic improvement and semen quality, impacting boar productivity and dose output.

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Area of Science:

Animal Science
Reproductive Biology
Veterinary Medicine

Background:

Boar studs are crucial for swine artificial insemination programs.
Understanding current management practices is essential for optimizing boar reproductive efficiency and welfare.

Purpose of the Study:

To survey and describe current management and semen collection practices in Canadian and USA boar studs.
To identify factors influencing boar culling and semen discard rates.

Main Methods:

A survey was distributed to 44 boar studs in Canada and the USA.
Data collected included boar housing, feeding, age, culling rates, semen collection protocols, and semen evaluation methods.

Main Results:

Most boars (90%+) were housed in stalls, with evaporative/mechanical cooling predominant.
Annual culling rates ranged from 20-70%, primarily for genetic improvement, semen quality, and leg issues.
Semen evaluation utilized photometers and CASA, with discard reasons including poor motility, abnormal sperm, and bacteria.

Conclusions:

Boar management practices vary, with significant culling for reproductive and health reasons.
Semen quality control measures are implemented, but discard rates are influenced by boar individuality and season.
Standardized protocols can enhance semen yield and dose production.