The effect of cropectomy on selected reproductive and physiological characteristics of laying hens.
Two-hundred and fifty Babcock B-300 pullets (18 weeks of age) were either cropectomized, sham-operated or used as unoperated controls in two experiments.  Although feed consumption was slightly less in cropectomized birds than in control birds, the pattern of feed consumption in relation to time of day remained unchanged.  Egg production and body weight of cropectomized birds were significantly lower than that of control or sham birds.  Egg weight was not affected by cropectomy or the sham operation.  Cropectomy had no influence on the pattern of serum calcium or on egg specific gravity in relation to time of day; however, serum calcium and egg specific gravity  was consistently lower at each time interval measured throughout the day or night when compared to that of controls.  The adverse effect of cropectomy on specific gravity of eggs and serum calcium indicated that the crop is an important organ in the laying hen.  The crop appeared to serve as a storage depot for feed providing the bird with nutrients necessary for optimal shell quality during periods on non-consumption.
D000821:Animal Feed; D000818:Animals; D001835:Body Weight; D002118:Calcium / Q000097:blood; D002645:Chickens / Q000502:physiology*; D003426:Crop, Avian / Q000502:physiology* / Q000601:surgery; D004531:Eggs; D005260:Female; D010058:Oviposition; D012098:Reproduction; D013046:Specific Gravity
D002118:Calcium