Yes, it IS very frustrating trying to give nothing but the best to our birds. As for cherries (my own favorite temperate climate fruit), in the last couple of years I've noticed we've been getting some from our fine neighbors to the north (usually BC), which I have been assuming (hoping!) are less pesticide-laden than ours. They are usually later in the season than ours. Also, Trader Joe's sells cherries in jars imported from Germany. They do add a little sucrose to the water (hardly noticeable), but I'll take a little sugar over pesticides/herbicides any day. banned, if you'd like to try a jar, I'll send you one, (and then perhaps you'd offer your evaluation here?).
To add to the info from banned's link, here are some clippings from my own lectures (on-line and in-class). My information does not come from "radical environmental groups" but from the CDC (U.S. gov.), Mayo Clinic, Physicians For Social Responsibility, the Women's Health Initiative (U.S. gov.), EPA (U.S. gov.) and my own readings of the peer-reviewed scientific literature. You will see some of the same chemicals mentioned in banned's article. I actually have links embedded, but they didn't come through here, so I'll try to put some at the end. The point of me adding all of this is that smaller organisms (such as our birds) are going to feel the effects sooner; we often feed our birds what we feed ourselves; the same kinds of problems have been seen all across the spectrum of vertebrate organisms, including ourselves and our birds.
MALE HORMONES AND SPERMATOGENESIS
For purposes of this class, all of the hormones involved in reproduction will be collectively called Reproductive Hormones. Some of these hormones also have other functions in the body that do not involve reproduction. One of the great mysteries of hormones is how the same hormone can have a variety of functions based upon which cell type or tissue it targets. Not only that, but the same hormone operates differently in different species! For example, prolactin in human females is involved in milk production. In birds (which do NOT nurse their young with milk), prolactin triggers the urge to migrate.
The word ?targets? is somewhat of a misnomer, because a cell or tissue is influenced by a hormone only if it has receptor sites for that hormone on its cell surfaces. Receptor sites and hormones work together in a lock and key fashion. It takes the right key in the lock to unlock a door and gain access to the room. There may be several ?close fits,? i.e. several keys may appear to fit into a lock, but the shape of the key has to be a near perfect match to turn the lock and thus gain access. In cells, the receptor sites are the locks, and the hormones are the keys. A hormone matching the correct receptor site will unlock an opening into the cell and gain access to the cell interior. The hormone then stimulates a specific portion of DNA to create a specific product; sometimes another hormone. Like the example I gave earlier of the female moth spewing pheromones that diffuse through the air, hormones diffuse throughout the body via the circulatory system. Blood, and everything in it, eventually reaches every cell in the body. If a hormone is present in the blood and the cells by which it passes do not have receptor sites for that hormone, the hormone passes on by. If a receptor site IS present, it welcomes the hormone into its embrace, so to speak.
IV. Factors Affecting Spermatogenesis
A. Heat
B. Radiation
C. Abstinence from sexual activity
D. Environmental Pollutants (dioxins AKA organochlorines, PCBs, pesticides such as DDT)** - act as "Endocrine Disruptors"
1. About 40 pesticides of all kinds, industrial chemicals, industrial byproducts, medical and municipal waste incineration
2. Sperm count in industrialized nations has decreased by 50% since WWII (and the ?Chemical Revolution?)
3. Increase in abnormal or non/low-motile sperm
4. Sperm absorb and metabolize such pollutants more easily than other cells, which can result in birth defects
5. Increase in incidence of cryptorchidism
E. Nature of Endocrine Disruptors (wildlife studies and rodent/primate lab studies)
1. The hormone-receptor complex interacts directly w/DNA to initiate specific gene products
2. An endocrine disruptor is an agent that intereferes with this normal sequence of events by interfering with normal hormone function (its synthesis, storage, release, secretion, transport, etc.)
3. Many of these pollutants are estrogen mimics
a) Recall estrogen causes cell division (proliferation)
b) Increase in testicular cancer in U.S. and Europe (ex. DES meta-analysis)
c) Increase in other reproductive tract cancers (breast, prostate)
d) Increased incidence of endometriosis (dioxin - in herbicides and pesticides)
4. Some block receptor sites from more potent endogenous hormones
5. Some are anti-androgenic (ex. the fungicide Vinclozolin, DDE)
a) Hypospadias (urinary outlet on underside of penis or in perineum), also often accompanied by a downward bowing of the penis called chordee.
(1) It can lead to difficulties achieving an erection
(2) Almost one per 100 males are born with hypospadias (Atlanta study)
b) Reduced testes size
c) Reduced accessory glands
d) Decreased sperm production
e) Feminization of organs (default is "female" in absence of androgen)
f) Alteration of 50/50 sex ratio in favor of females (PCBs, DDT)
6. Lead also associated w/testicular damage, decreased sperm count, abnormal sperm, low motility
7. Examples
a) Experiments exposing gull eggs w/DDT resulted in functional hermaphrodites
b) Male rats whose mothers were injected w/dioxins would not mate with females; instead moved into female-like mating position in the presence of males
(1) These same rats only produced half the normal amount of sperm
(2) Similar results with 3 species of gulls (induced ?homosexuality?) when eggs exposed
c) Female hamsters exposed in utero engaged in male behaviors including mounting females
d) Various populations of fish, birds, reptiles in contaminated environments that have undeveloped gonads, partial gonads, both sexes and many other physical defects
F. Recommendations to minimize exposure
1. Pay attention to fruit sources and seasonality; DDT etc. in off-season imported fruits
2. Wash fruits/veggies w/soap to remove waxed-in contaminants
3. Remove fat from fish and meat prior to cooking (toxic chemicals accumulate in fat)
4. Minimize consumption of butter, cheeses, cream, etc. (PCBs, dioxin, DDT found in milk)
5. Limit consumption of game fish (higher on food chain, chemicals more concentrated)
6. Keep own body fat low (so don?t accumulate as many toxins)
7. High fiber diet in women appears to prevent absorption of estrogenic substances
*** PCB?s: In transformer insulators (no longer manufactured in U.S., but obviously still around)
Dioxins: Used in paper bleaching, product of many manufacturing processes such as plastics, PVC, grain silo internal coating
DDT: Insecticide (breaks down to DDE, also toxic); no longer used in U.S. but persistent in environment, and used elsewhere
Bisphenol-A: In polycarbonate plastics, epoxy resins, flame retardants, coating inside food cans, dental sealants
Preparation for and Confirmation of Pregnancy A. Planning Ahead- Birth control (family planning) and diagnostic tests give prospective parents the ability to plan ahead
1. Avoid teratogenics (things which cause birth defects) (terato = monster)
a. Early embryological development is extremely sensitive to chemicals/hormones
i. Embryo Images
ii. Hypospadias - malplacement of the urinary outlet of the penis
b. Known Teratogenics: Alcohol, smoke, tobacco products, environmental pollutants, X-rays, tetracycline, NOX, Accutane
c. Nicotine passes easily into milk, therefore, a smoking cessation program that involves nicotine patches or gum should be completed before attempting to get pregnant
d. Environmental Contaminants (Endocrine Disruptors) - brief overview
e. Several case studies and the most well known effects:
i. Herbicide "Atrazine" (and 3 other similar pesticides) in water is associated with:
a. High rates of low birth-weight babies (low birth-weight babies often require critical care and are more susceptible to health problems)
b. Increased rate of premature births
c. Increased growth retardation (fetus does not develop and grow at the normal rate)
d. Skeletal and mental defects
e. Learning disabilities
f. Shortened penises
ii. PCBs in Great Lakes Fish: mothers eating fish from the Great Lakes have babies with the following:
a. Low birth weight
b. Smaller skull circumferences (the skull houses the brain)
c. Cognitive (ability to learn, reason, and remember) defects
d. Developmental defects (mental or physical disabilities arising from abnormal development of the early embryo)
e. Motor (neuromuscular) defects
f. Link to source
iii. Organochlorines
a. Learning disabilities
b. Change in behavior, sexual response
c. Abnormal genital development
d. Immune System problems
e. Abnormal/retarded brain development
2. Immediately adjust nutritional needs (folic acid, vitamins, minerals,
etc.)
http://www.cdc.gov/od/oc/media/pressrel/hypospad.htmhttp://www.csupomona.edu/%7Ecmbrady/cou ... isrpt.htmlhttp://www.med.unc.edu/embryo_images/un ... s/akgs.htm