Inability to demonstrate an effect of eggshell #49 on shell quality in older laying hens

Journal of Applied Poultry Research

Volumn 7, Issue 2, 1998, Pages 219-224

  Dale, Nick ^a   Strong Jr , Charles F ^b  

^a UNIVERSITY OF GEORGIA   (United States)

^b Cal Maine Foods   (United States)

Author keywords

Eggshell 49; Manganese; Shell quality; Zinc

Indexed keywords

EID: 0032367679     PISSN: 10566171     EISSN: None     Source Type: Journal    
DOI: 10.1093/japr/7.2.219     Document Type: Article

References (24)

1. Washburn, K.W., 1982. Incidence, cause, and prevention of eggshell breakage in commercial production. Poultry Sci. 61:2005-2012.
2. Latshaw, J.D. and K.A. Turner, 1991. Failure of two feed additives (Shell-developer and Ethical) to improve eggshell quality. Poultry Sci. 70:593-599.
3. Klecker, D., L. Zemar, V. Siske, and J. Gomez Basauri, 1997. Influence of trace mineral proteinate supplementation on eggshell quality. Poultry Sci. 76(Suppl):131 (Abs).
4. Eggshell #49 is a mineral supplement for layers produced by Alltech, Inc., Nicholasville, KY. The product contains 0.75% zinc, 0.45% manganese, and 0.10% copper as proteinates; calcium carbonate, calcium phosphate, and yeast culture constitute the remainder of the product.
5. National Research Council, 1994. Nutrient Requirements of Poultry. 9th Rev. Edition. Natl. Acad. Sci., Washington, DC.
6. Hy-Line W-36 Management Guide (1998-1999), Hy-Line Intl., West Des Moines, IA, recommends addition of 66 ppm manganese and 66 ppm zinc. DeKalb XL Pullet and Layer Management Guide (1995), DeKalb Poultry Research, DeKalb, IL, recommends addition of 70 ppm manganese and 50 ppm zinc. In both cases, these are in addition to levels present in other ingredients.
7. Hy-Line W-36 Management Guide (1998-1999), Hy-Line Intl., West Des Moines, IA, recommends addition of 66 ppm manganese and 66 ppm zinc. DeKalb XL Pullet and Layer Management Guide (1995), DeKalb Poultry Research, DeKalb, IL, recommends addition of 70 ppm manganese and 50 ppm zinc. In both cases, these are in addition to levels present in other ingredients.
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20. Determined by I.C.P., Thermo Jarrell Ash Co., Franklin, MA.
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