Thursday, November 27, 2014

Cashmere Goats and their Fiber


Cashmere goats can serve a multitude of purposes:
They produce 3-4 ounces of fine, soft fiber a year which can be processed into wool for knitted garments
They are useful for clearing fence lines and undesirable weeds
Their pelts can be used for rugs and seat covers
Their meat is low in cholesterol

Their history:
Cashmere goats originally came from the Himalayas and migrated with Chinese herders to Mongolia, Tibet and Northern provinces of China in the 10th and 12th centuries.  With the development of the Asian empire, cashmere slowly began to enter the trade routes in the West. In the 13th century Marco Polo brought cashmere to Italy where it became the fiber of choice among the aristocratic elite.

Processing the fiber:
Our cashmere goats have a fine, downy undercoat which protects them from the cold winters, Each spring the fleeces are removed by either combing or shearing. A typical adult goat produces 3-4 oz. of pure down, enough for about 1/3 of a sweater.  The finest cashmere is harvested when the goat is 2-4 years old and after the age of five, the goat’s value is based on its ability to produce offspring.  Once the cashmere is combed off or sheared, the dirt, grass and other non-fiber contaminants must be removed.  The fiber is then sorted by fineness and length.  Coarse hairs are removed leaving behind the medium and long fine hairs.  The shortest cashmere hairs are extremely soft, but because they are so short they will pill if they are woven into clothing.  The fleece is then sorted by color which can be white, off white, tan, brown or grey.   The fleece is then washed, dried and spun into skeins of yarn or left as raw roving.  It takes approximately a year’s worth of wool from three to four goats in order to make a woman’s single ply cashmere sweater. Cashmere is eight times warmer than sheep’s wool and 33% lighter. Cashmere fiber has a crimp or curl that sheep’s wool does not have.  This extra crimp holds pockets of warm air close to the body.  It is the softest animal fiber readily available on the market measureable by its low micron count.  The micron count is the measure of the diameter of the fiber and the lower the number, the softer the fiber.  The finest cashmere has a micron count of 16 or less.

Un-dyed cashmere ranges in color from a snowy white to a chocolate brown with variations of brownish-grey.  White is the most valuable because it can readily accept dye.  However, the more dye that is used, the coarser it feels.  The naturally darker cashmere fibers will be dyed when trying to achieve a black, dark navy, charcoal or brown.  The natural white cashmere fibers will be bleached white and dyed into pastel colors.

Most cashmere sweaters have a label that says Dry Clean Only, but this is to remove liability should you incorrectly wash your cashmere and ruin it.  The quality of a cashmere item can actually improve if you wash it properly in cold water by hand or machine and dry without any heat. It is more expensive to hand knit a cashmere sweater than to buy one because the hand knitting yarn is much thicker than commercial yarn.  The cashmere sweater you buy in a store uses a much thinner commercial yarn which cannot be hand knit. The world produces 9,000-10,000 tons of cashmere each year.

50-60% comes from China (including Tibet and Inner Mongolia)
20-30% comes from Mongolia
10-20% comes from Iran and Afghanistan

Friday, November 14, 2014

Albino Squirrel

Only 10 in every one million squirrels are born with albinism, and have a very short life expectancy because they are easily seen by both predators and prey due to their obvious lack of camouflage.

What we normally think of when we think of squirrels are tree dwelling gray or reddish mammals. Rarely do we imagine their cousins, the ground squirrels (Prairie dogs) or marmots, even though they are in the same family. Nor do we think of squirrels as white! But, there are many places  that have white or albino squirrel populations.

Most squirrels are gray or red, an adaptation that allows them to blend in to the surrounding vegetation. Tree trunks are usually a dark color and the mottled gray color of the common forest squirrels. However, several towns across america have claimed to have a large population of white squirrels. How could this be if it is advantageous to blend in with the tree trunks to hide from predators?

This is a case of classic natural selection, the driving force behind evolutionary change. Evolution by definition is the changing of the genetic makeup of a population over time. The trait for being white is a genetic anomalie that is usually weeded out because they are so quickly seen by predators. But today we have a different predator: humans.

Many towns have proclaimed to be the "Home of the White Squirrels," and as a result have started trapping and removing their darker brothers and sisters. What a great example of natural selection that has quickly created a dominant squirrel population that is white.

However, there are other places around the country where white squirrels are popping up and it may not be a result of humans trapping the squirrels. Many places have white stone and white buildings of which white squirrels would be highly adapted too. This small advantage may allow white squirrel populations to spread.