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Nutritive values of various calcium supplements in laying hen diets 2. effects of varying levels of dietary calcium on egg production feed efficiency and egg shell quality



Nutritive values of various calcium supplements in laying hen diets 2. effects of varying levels of dietary calcium on egg production feed efficiency and egg shell quality



Korean Journal of Animal Science 23(3): 199-205



The effects of various levels of dietary Ca (1.75, 2.25, 2.75, 3.25 and 3.75%) on laying performances were compared using 1500 White Leghorn layers for 22 wk. Egg production rate and feed efficiency were significantly (P < 0.05) improved as the Ca level increased. There were no significant differences between the 3.25 and 3.75% Ca levels on egg production rate and feed efficiency. Average egg weight was not influenced by the levels of Ca in the diets. The ratios of egg shell thickness and shell weight to egg weight significantly (P < 0.05) increased as the Ca level of diet increased. There were no significant differences in egg shell qualities between the 3.25 and 3.75% Ca levels. No difference was found either in Ca and P contents of the tibia or in nutrient usability of experimental diets. Ca usability was highest at a 2.75% dietary Ca level. The laying performance and feed efficiency can apparently be improved by increasing the Ca level in the diet up to 3.25%.

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