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<blockquote data-quote="djinwa" data-source="post: 941110" data-attributes="member: 8265"><p>I forgot about this thread, so a little more info.</p><p></p><p>Yes, TB, polar bears are white because black polar bears have a little harder time sneaking up on a seal, "for crying out loud!" Black would give them an advantage staying warm in the winter, except that only works when the sun is shining, which isn't often. The advantage of catching something to eat (or not being eaten if you are prey) outweighs the disadvantage of less warming.</p><p></p><p>Yes, there are black people in hot climates. If you lack hair to protect you from UV radiation, you need dark skin to avoid sunburn and cancer.</p><p></p><p>Ideal cattle have a light hair coat to reflect solar radiation, but pigment on exposed skin to avoid sunburn. These are widely accepted concepts, yet there contiunues to be resistance to them among cattle folk.</p><p></p><p>Here's some reading:</p><p></p><p><a href="http://nimss.umd.edu/homepages/home.cfm?trackID=11616" target="_blank">http://nimss.umd.edu/homepages/home.cfm?trackID=11616</a></p><p></p><p></p><p></p><p><a href="http://www.iowabeefcenter.org/Cattlemen'sConference/heat%20stress%20study.pdf" target="_blank">http://www.iowabeefcenter.org/Cattlemen ... 0study.pdf</a></p><p></p><p>death loss in feedlots during heat wave</p></blockquote><p></p>
[QUOTE="djinwa, post: 941110, member: 8265"] I forgot about this thread, so a little more info. Yes, TB, polar bears are white because black polar bears have a little harder time sneaking up on a seal, "for crying out loud!" Black would give them an advantage staying warm in the winter, except that only works when the sun is shining, which isn't often. The advantage of catching something to eat (or not being eaten if you are prey) outweighs the disadvantage of less warming. Yes, there are black people in hot climates. If you lack hair to protect you from UV radiation, you need dark skin to avoid sunburn and cancer. Ideal cattle have a light hair coat to reflect solar radiation, but pigment on exposed skin to avoid sunburn. These are widely accepted concepts, yet there contiunues to be resistance to them among cattle folk. Here's some reading: [url=http://nimss.umd.edu/homepages/home.cfm?trackID=11616]http://nimss.umd.edu/homepages/home.cfm?trackID=11616[/url] [url="http://www.iowabeefcenter.org/Cattlemen'sConference/heat%20stress%20study.pdf"]http://www.iowabeefcenter.org/Cattlemen ... 0study.pdf[/url] death loss in feedlots during heat wave [/QUOTE]
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