Effect of high dietary copper on gizzard integrity of the chick
Six experiments were conducted with male broiler chicks kept in battery brooders to investigate the effects of feeding diets high in copper on the integrity of the gizzard lining. Conventional and corn starch-soy basal diets were used. Slight improvements in body weight gain and/or feed efficiency were observed when the diets were supplemented with 250 ppm copper as CuSO/sub 4/5H/sub 2/O, but higher levels (500 to 1000 ppm) depressed growth and decreased feed efficiency. Little or no gizzard erosion was seen in birds fed the practical ration without added copper. Gizzard erosion was observed with 250 ppm copper and the severity of the condition increased with higher levels. With the same level of copper supplementation, severity of gizzard erosion was greater when chicks were fed the corn starch-soy diet than when fed the practical diet. Adding 0.5 ppm selenium to the practical diet containing 1000 ppm copper slightly improved the appearance of the gizzard lining, although the subjective scoring index was significantly (P < 0.05) lower in only one of two experiments. The addition of zinc, vitamin E, and vitamin B/sub 12/ did not prevent the gizzard damage caused by high copper levels. Severity of gizzard erosion was significantly reduced by adding 0.35% cholic acid to the semipurified diet with 500 ppm copper, but not to the practical diet with 1000 ppm copper. There was no correlation between acidity of the gizzard contents and severity of the erosion. 18 references, 7 tables.
- Research Organization:
- Univ. of Georgia, Athens, GA (United States)
- OSTI ID:
- 5434051
- Journal Information:
- Poult. Sci.; (United States), Vol. 55:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHICKENS
DIGESTIVE SYSTEM
COPPER
BIOLOGICAL EFFECTS
ANIMAL FEEDS
DIET
ECOLOGICAL CONCENTRATION
EXPERIMENTAL DATA
GROWTH
INHIBITION
MAIZE
SELENIUM
ANIMALS
BIRDS
CEREALS
DATA
ELEMENTS
FOOD
FOWL
GRASS
INFORMATION
METALS
NUMERICAL DATA
PLANTS
SEMIMETALS
TRANSITION ELEMENTS
VERTEBRATES
560305* - Chemicals Metabolism & Toxicology- Vertebrates- (-1987)