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Relative Bioavailability of Broiler Chickens Fed with Zinc Hydroxychloride and Sulfate Sources for Corn-Soybean Meal
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Relative Bioavailability of Broiler Chickens Fed with Zinc Hydroxychloride and Sulfate Sources for Corn-Soybean Meal
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Relative Bioavailability of Broiler Chickens Fed with Zinc Hydroxychloride and Sulfate Sources for Corn-Soybean Meal
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Journal Article
Relative Bioavailability of Broiler Chickens Fed with Zinc Hydroxychloride and Sulfate Sources for Corn-Soybean Meal
2022
Overview
This study was conducted to determine relative bioavailability (RBV) of basic zinc chloride (BZC) compared to zinc sulfate monohydrate (ZSM) for broilers. A randomized design involving a 2 × 3 factorial arrangement of the different treatment regimens plus one negative control was set up for this study. A total of 630 newly hatched male AA broiler chicks were randomly allocated to 42 different pens (15 chickens/pen) and assigned to 7 dietary treatments in a completely randomized design. The diet was supplemented with 0, 20, 40, or 80 mg of Zn mg/kg of feed in the form of ZSM or BZC. The results showed that zinc supplementation altered average daily gain (ADG) and feed conversion ratio (FCR) (P < 0.05) for both zinc sources. It was observed that the weight gain increased linearly (P < 0.01) and FCR decreased linearly as dietary BZC and ZSM concentration increased. Moreover, compared with chickens fed with ZSM, chickens fed with BZC had higher ADG and lower FCR from days 0 to 14 (P < 0.05), and higher activity of plasma alkaline phosphatase (ALP) (P < 0.05), total superoxide dismutase (T-SOD), and CuZn superoxide dismutase (CuZn-SOD) (P < 0.01) in the plasma of chickens fed with BZC at zinc level 80 mg/kg at day 14. The pancreas divalent metal-ion transporter-1 (DMT1) mRNA expression of chickens fed with BZC was found to be significantly enhanced at day 28, and the pancreas metallothionein (MT) mRNA expression for BZC fed group was also markedly increased at Zn levels of 20 and 40 mg/kg respectively. The relative bioavailability (RBV) of BZC (Zn sulfate 100%) based on ADG in the starter phase was 110.82%, whereas the tibia zinc content, as well as the activities of plasma ALP and CuZn-SOD, and the pancreas MT mRNA level were in the range between 108 and 119%. It was thus concluded that BZC was more efficacious than Zn sulfate and could serve as a potentially novel zinc source in the broilers.
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