Forum Show 01-06-10 BBC - Earth News - Clever Nature: Class of 2009,Winter Suet is for the Birds!

Wandering About Nature Today-
BBC-Global warming Icemelts causing Methane leaks from Ice & Permafrost:
http://news.bbc.co.uk/2/hi/science/nature/8437703.stm

BBC - Earth News - Clever Nature: Class of 2009

Opinion Featured On CNN-Outcome of COP15 Conference:
http://edition.cnn.com/2010/TECH/science/01/04/climate.mark.lynas/index.html

http://www.sialis.org/suet.htm

lard vs. vegetable shortening:

"(Beef or Sheep) Suet vs. (Pig) Lard vs. Vegetable Shortening (Crisco, etc.): All work in suet recipes, as long as you adjust the dry ingredients (e.g., flour) to keep the texture crumbly. Vegetable shortening has a longer shelf life. Suet in its raw form should be avoided. Beef suet may turn rancid when temperatures exceed 70 degrees. When melted and clarified, beef suet is called "tallow." Tallow is less likely to go rancid over time; however it is not easily digested by birds because it is high in saturated fats. Some birders are concerned about the health impact of using vegetable shortening.



* A nutritionist at the San Diego Zoo indicated that there is no health risk associated specifically with vegetable oil.

* Dr. Sean Pampreen, an avian vet in Marlborough, CT, indicated he did not think that vegetable shortening used as a binder in suet (which is only a supplemental food for wild birds) would cause digestive problems, especially since sunflower, millet and peanut are about 45-56% oil.

* Bill Whittaker of Four Nature's Keepers says saturated fats (such as in suet) are more difficult/require more energy for birds to digest than unsaturated fats (such as in vegetable shortening). They also found in field tests that after a familiarization period, birds prefer vegetable shortening.

* Dr. Kirk Klasing, Professor of Avian Nutrition at UC Davis, said that very high amounts of fatty acids are difficult to emulsify by the bile, lowering digestibility. Adding a source of unsaturated fats, such as vegetable oil or lard, improves digestibility (e.g., 80% tallow, 20% vegetable oil or lard is a good combination - you can adjust the proportions to give the melting point desired). Peanut butter also works to increase digestibility of tallow because it is high in unsaturated fats. He was not aware of any evidence for a laxative effect of vegetable oil. Like tallow, vegetable shortening is solid at room temperatures. However, the hydrogenation used to make shortening results in lots of trans fatty acids. Though we don't know for sure, it is likely that the trans fatty acids are less healthy than "natural" cis fatty acids (unhydrogenated oils).

In chickens, high levels of trans fatty acids deplete antioxidants in the tissues. It would be best to avoid high levels of vegetable shortening.

* Crisco does make a zero-trans-fat shortening (in a green container.)

* Another alternative is soybean shortening without additives, at as low a melting temperature (less saturation) as you can use to make an acceptable food.



In terms of protein content, suet has about 0.4 grams of protein/oz. in it; lard and vegetable shortening have none. Both suet and vegetable shortening have about the same amount of calories and fat content. Beef suet has more saturated fat which may be harder to digest.



JL Peterson found bluebirds preferred recipes made with suet. A friend reported bluebirds in her area preferred Crisco-based suets. Crisco does offer a zero-trans fat product. If you're concerned about using either of these ingredients, you can replace them with extra peanut butter until the mixture reaches the desired consistency."



So, I will definitely be using vegetable shortening, I'm going to see if they have an organic version at the health food store. It just doesn't feel right to me to help out some animals by feeding them other animals. I'm also going to use raw peanuts and seeds instead of commercial peanut butter, like the birds would naturally eat. Cooking food kills all the enzymes which are so necessary for cells to be able to use the nutrients in the food.