Title: Effects of Eggshell 49 on egg qualities of breeder laying hens
Abstract: Four hundred and fifty nine weeks old Brown Hyline breeder laying hens were randomly divided into 2 groups, one of which, used for treated group, was fed the basal diet with the addition at the rate of 1 g per kg of feed, while the other served as control. The whole feeding trial lasted for 70 days. The results were as follows: (1) The total unqualified eggs in treated group were reduced by 1.3% compared with control. (2) Some main parameters of egg quality (including thickness of eggshell, strength of eggshell, Haugh units, gravity) and serum zinc, serum manganese as well as serum alkaline phosphatase activities of treated group were significantly higher than those in control. (3) There were no significant differences ( p 0.05) in egg fertility and hatchability, serum calcium,serum phosphorus and mineral contents (P, Mn, Zn) of eggshell between two groups. (4) Electron micrograph of eggshell and egg membrane showed that the papillform bodies in papillary stratum of eggshell in treated group were smaller, but uniform in size, and attached more closely to shell membrane and the fibres in shell membrane were densely fabricated, while the papiliform bodies in control looked larger, varied in size and loosely attached to shell membrane. These results indicated that the dietary inclusion of Eggshell 49 in laying hens during their later egg production period could really improve eggshell qualities to a certain extent.
Publication Year: 2001
Publication Date: 2001-01-01
Language: en
Type: article
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