Influences of long-term feeding of dehydrated kitchen waste on laying performance and eggshell quality in hens
2007
Kojima, S.(Tokyo-to. Agriculture and Forestry Research Center, Ome (Japan))
This experiment was conducted to study the long-term feeding effects of dehydrated kitchen waste (DKW) on laying performance and eggshell quality in laying hens. A total of 60 (Rhode Island Red, YR line) laying hens were assigned to 3 treatments. Each treatment had 4 replicates with 5 birds each from 33 to 77 week of age. The birds in a control were fed 100% commercial diet and the others were fed one of two diets containing 25% DKW and 75% commercial diet (25% DKW), 50% DKW and 50% commercial diet (50% DKW) by weight. Performance of egg production was recorded through the experiment, and contents of crude ash, calcium (Ca) and phosphorus (P) in the tibia, and contents of serum Ca and P were determined at the end of experiment. Contents of Ca and P in the eggshell were determined at the last consecutive 7 days of the experiment. 50% DKW decreased egg weight compared with the control and 25% DKW treatment (P0.05). However, there were no differences in performance of weight gain, feed intake, egg mass, egg production and feed conversion. Shell strength, shell thickness, lightness (L*) and redness (a*) of shell color were significantly differences with increased DKW (P 0.05). Contents of Ca in the eggshell, the tibia and the serum of hens fed 50% DKW diet were significantly decreased compared with that of control diet (P0.05). Contents of P in the eggshell and the tibia were not affected by the diet. However, serum P level was decreased as DKW content increased (P0.05). These results suggest that long-term feeding the food containing 50%DKW to hens decreases tibia Ca, eggshell Ca and serum Ca levels, and then declines shell quality. However, DKW contains nutritional value for hens to maintain unchanged laying performance without egg weight.
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