Midnight feeding of commercial laying hens can improve eggshell quality

Journal of Applied Poultry Research

Volumn 5, Issue 1, 1996, Pages 1-5

  Harms, R H ^a   Douglas, C R ^a   Sloan, D R ^a  

^a UNIVERSITY OF FLORIDA   (United States)

Author keywords

Percentage shell; Shell weight; Shell weight per unit surface area; Specific gravity

Indexed keywords

EID: 0030548464     PISSN: 10566171     EISSN: None     Source Type: Journal    
DOI: 10.1093/japr/5.1.1     Document Type: Article

References (13)

1. Anderson, C.B. and T.C. Carter, 1976. The hens' egg: Shell breakage at impact on a heavy stiff body and factors that affect it. Br. Poultry Sci. 17:613-626.
2. Roland, D.A., Sr., 1977. The extent of uncollectible eggs due to inadequate shell. Poultry Sci. 56:1517-1521.
3. Scott, M.L., S.J. Hull, and P.A. Mullenhoff, 1971. The calcium requirements of laying hens and effects of dietary oyster shell upon eggshell quality. Poultry Sci. 50:1055-1063.
4. Roland, D.A., Sr., D.R. Sloan, and K.H. Harms, 1972. Calcium metabolism in the laying hen. 1. Calcium retention in the digestive tract of the laying hen. Poultry Sci. 51:598-601.
5. Roland, D.A., Sr., D.R. Sloan, and R.H. Harms, 1973. Calcium metabolism in the laying hen 4. The calcium status of the hen at night. Poultry Sci. 52:351-354.
6. Harms, R.H., 1974. Unpublished data.
7. Hy-Line International, West Des Moines, IA 50265.
8. Harms, R.H., A.F. Rossi, D.R. Sloan, R.D. Miles, and R.B. Christmas, 1990. A method for estimating shell weight and correcting shell weight and correcting specific gravity for egg weight in eggshell quality studies. Poultry Sci. 69:48-52.
9. DeKalb Poultry Research, Inc., DeKalb, IL 60115.
10. Nordstrom, J.O. and L.E. Ousterhout, 1982. Estimation of shell weight and shell thickness from egg specific gravity and egg weight. Poultry Sci. 61:1991-1995.
11. Roland, D.A., Sr. and R.H. Harms, 1974. Specific gravity of eggs in relation to egg weight and time of opposition. Poultry Sci. 53:1494-1498.
12. Miles, R.D., O.M. Junquiera, and R.H. Harms, 1984. Plasma phosphorus at 0, 6, and 21 hours postoviposition in hens laying in the morning and afternoon. Poultry Sci. 63:354-359.
13. Harms, R.H., 1991. Specific gravity of eggs and eggshell weight from commercial layers and broiler breeders in relation to time of opposition. Poultry Sci. 70:1099-1104.