Effects of Copper supplementation on performance and immune response in calves /
Three experiments used nursing calves to determine the effects of Cu on gain and hair coat condition. Exp. 1 & 2 treated calves were dosed with one Cu oxide (CuO) capsule at d 0. On d 36 of Exp. 2, calves were blocked by treatment and assigned a Se bolus or a control (Con) treatment. Body wei...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
2000.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=727852921&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | Three experiments used nursing calves to determine the effects of Cu on gain and hair coat condition. Exp. 1 & 2 treated calves were dosed with one Cu oxide (CuO) capsule at d 0. On d 36 of Exp. 2, calves were blocked by treatment and assigned a Se bolus or a control (Con) treatment. Body weights (BW), hair color (HC) and quality (HQ) scores were taken on d 0 in Exp. 1 & 2, d 126 in Exp. 1 and d 109 in Exp. 2. In Exp. 1, BW gains were 6% greater (P<.06) for CuO compared to Con. Changes in HC and HQ were not affected by treatment. In Exp. 2, serum Cu and whole blood Se levels were not affected by treatment. Body weight gain, HC and HQ were not affected by treatment. Exp. 3 treated calves received 200 mg on d 0, and 300 mg on d 60, of cupric glycinate (CuG). Body weight, metacarpal circumference (MC) and scrotal circumference (SC) measurements were taken on d 0, 60 and 147. Body weight gain and changes in MC, SC, and HC were not affected by treatment. Changes in HQ were lower in Cu-injected calves (P<.07). In Exp. 4, weaned steers were used to determine the effect of Cu, S/Mo and Cu/S/Mo supplementation on BW, feed intake (FI) and rectal temperature (RT). Steers were preconditioned 40 d on treatments supplied in cottonseed meal, and offered ad libitum hay. On d 28, S/Mo reduced serum Cu (P<.058) compared to Cu and Con. Daily gain was lower (P<.05) for Cu/S/Mo compared to S/Mo. At the feedlot, treatments were fed in a complete diet. Steers were IBRV challenged on d 15. Body weight, RT and FI were recorded for 13 d post-challenge. Serum Cu on d 0 of IBRV was higher (P<.01) for Cu/S/Mo compared to S/Mo and C, and lower (P<.03) for S/Mo compared to other treatments on d 13. Feed intake was not affected by treatments. Cu supplementation decreased RT on d 8 compared to S/Mo or Con. Copper and Con had lower (P<.06) ADG compared to S/Mo or Cu/S/Mo. |
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| Item Description: | Vita. "Major Subject: Nutrition". |
| Physical Description: | xi, 99 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilm Inc. |
| Bibliography: | Includes bibliographical references (leaves 81-93). |