nanuk
Stammmitglied
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"Avian Medicine von Branson W. Ritchie......etc.......
Referenz:
http://www.amazon.de/Avian-Medicine-Principles-and-Application/dp/0963699601
Seite: 77 - 78 an bezgl. Grit.......
Zitat:
"Grit is not required in the normal, healthy psittacine
or passerine bird. Grit, defined as a granular, dense,
insoluble mineral material (generally granite or
quartz) is required in birds that consume whole,
intact seeds. Examples of birds that require grit are
pigeons, doves, free-ranging gallinaceous species and
Struthioniformes. These species naturally eat whole
grains as a varying portion of their diet. Because of
the inert nature of the fibrous coating of many seeds
(particularly corn, peas), digestive enzymes are relatively
ineffective against them. Grit in the ventriculus
acts to grind the whole seeds, thereby providing
a substrate on which the digestive enzymes can act.
Psittacine and passerine birds normally remove this
fibrous hull, allowing the ingested portion to be easily
acted upon by the digestive enzymes. It is likely,
however, that in the case of a bird with a pancreatic
dysfunction or other problems involving the physical
digestion of food, grit could provide a benefit by
enhancing the surface area for digestive enzymes to
act. There have been numerous examples of birds not
having grit for 15 to 20 years and still not showing
any signs of decreased performance or poor digestion.
Amazon parrots that did not receive grit for over five
years still maintained high digestibility of ingested
sunflower seeds, showing the unimportance of grit in
the healthy bird.1 There have been numerous reports
of birds, especially with health problems and depraved
appetites, consuming copious quantities of
grit and developing crop or gastrointestinal impactions.
Considering the small chance of benefit and
the potential risk, ad libitum feeding of grit should be
avoided."
Referenz:
http://www.amazon.de/Avian-Medicine-Principles-and-Application/dp/0963699601
Seite: 77 - 78 an bezgl. Grit.......
Zitat:
"Grit is not required in the normal, healthy psittacine
or passerine bird. Grit, defined as a granular, dense,
insoluble mineral material (generally granite or
quartz) is required in birds that consume whole,
intact seeds. Examples of birds that require grit are
pigeons, doves, free-ranging gallinaceous species and
Struthioniformes. These species naturally eat whole
grains as a varying portion of their diet. Because of
the inert nature of the fibrous coating of many seeds
(particularly corn, peas), digestive enzymes are relatively
ineffective against them. Grit in the ventriculus
acts to grind the whole seeds, thereby providing
a substrate on which the digestive enzymes can act.
Psittacine and passerine birds normally remove this
fibrous hull, allowing the ingested portion to be easily
acted upon by the digestive enzymes. It is likely,
however, that in the case of a bird with a pancreatic
dysfunction or other problems involving the physical
digestion of food, grit could provide a benefit by
enhancing the surface area for digestive enzymes to
act. There have been numerous examples of birds not
having grit for 15 to 20 years and still not showing
any signs of decreased performance or poor digestion.
Amazon parrots that did not receive grit for over five
years still maintained high digestibility of ingested
sunflower seeds, showing the unimportance of grit in
the healthy bird.1 There have been numerous reports
of birds, especially with health problems and depraved
appetites, consuming copious quantities of
grit and developing crop or gastrointestinal impactions.
Considering the small chance of benefit and
the potential risk, ad libitum feeding of grit should be
avoided."