Growth-Promoting Efficacy of Tetrabasic Zinc Chloride and Two Sources of Zinc Oxide for Newly Weaned Pigs
نویسندگان
چکیده
Pharmacologic levels of supplemental Zn are well established as growth promoters for newly weaned pigs. Feed-grade zinc oxide (ZnO) manufactured by the Waelz process dominates the feed-grade Zn market for pigs, and this source of ZnO also has been most heavily researched as a growth promotant for nursery pigs (Hahn and Baker, 1993; Hill et al., 1999; Mahan et al., 2000; Mavromichalis et al., 2000). Our research with chicks has demonstrated that Waelz ZnO (72% Zn) has a relative Zn bioavailability (RBV) of around 43% relative to analytical-grade ZnO (80.3% Zn). Another source of feed-grade ZnO is manufactured by the hydrosulfide process and contains about 78% Zn. Our research has shown that the RBV of Zn in this product is somewhat higher than that in analytical-grade ZnO (Edwards and Baker, 1999).
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