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Zinc Requirement of the Baby Pig When Fed Wet-Autoclaved Spray-Dried Egg Albumen as the Protein Source^1,2,3,

Departments of Animal Science ^* Department of Biochemistry, University of Missouri, Columbia, MO 65211

Pigs 16 d of age were allotted to eight dietary levels of total zinc (6–36 ppm in 5 ppm increments and 116 ppm) in a 28-d experiment designed to reevaluate the zinc requirement of the neonatal pig. The basal 21.0% crude protein diet contained wet-autoclaved spray-dried egg albumen (WAEA) as the protein source. Dietary zinc level did not affect (P > 0.05) pig growth for the first 14 d of the experiment. Pig growth was adequate from d 14 to 28 of the experiment with 11 ppm or more of zinc. The milligrams of zinc retained per day per pig increased (P < 0.05) with increasing dietary zinc up to 26 ppm, plateaued from 26 to 36 ppm and declined (P < 0.05) at 116 ppm. Plasma zinc levels were higher (P < 0.05) for pigs fed 31 ppm or more of zinc compared with 16 ppm or less of zinc on d 21 and 28. Tibia and femur concentrations of zinc also increased with increasing dietary zinc up to 26 ppm. Esophageal tissue was normal in the majority of pigs fed 31 ppm or more of zinc. Retention of ⁶⁵Zn further suggested that diets containing 26 ppm or less zinc were deficient in this element. Thus, zinc balance, concentrations of zinc in plasma and bone, esophageal histology and retention of ⁶⁵Zn indicate that the minimum zinc requirement of the neonatal pig is between 26 and 31 ppm when fed a purified diet devoid of phytate.

KEY WORDS: • zinc requirement • egg albumen • neonatal pig • parakeratosis

¹ Contribution of the Missouri Agricultural Experiment Station.

² Supported in part by National Science Foundation Project No. PFR8011114 and National Institutes of Health Institutional Biomedical Research Support Grant RR-07053.

³ Presented at the seventeenth meeting of the Midwestern Section of the American Society of Animal Science, Chicago, IL, March 26–28, 1984. J. Anim. Sci. 59 (Suppl. 1), 78 (abs.).

⁴ For reprints: T. L. Veum, 110 Animal Sciences Center.

Manuscript received 13 February 1985. Revision accepted 6 August 1985.