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Evaluation of the effects of chromium supplementation on growth and nitrogen balance of camel calves under summer conditions

机译：夏季铬添加对骆驼犊牛生长和氮平衡的影响评估

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One of the most important problems in the production of camels in arid and semi-arid zones is the reduced feed intake and consequent low growth rate during summer. Under these stressful environmental conditions, chromium (Cr) supplementation to the diet of growing camel calves may be beneficial. Therefore, the objective of this study was to evaluate the effects of feeding a diet supplemented with different levels of Cr on growth performance of camel calves reared in a hot arid environment. A total of 15 male camel calves (4-5-month-old, 123 +/- 7 kg body weight) were used in this study. The animals were divided into three equal groups (A, B, C), 5 animals each, and housed individually under shelter. Camel calves were fed ad libitum on either total mixed ration (TMR) without Cr supplementation (group A), TMR supplemented with 0.5 mg Cr/kg DM (group B), or TMR supplemented with 1.0 mg Cr/kg DM (group C). Supplementation of 0.5 mg Cr/kg DM to the diet of camel calves did not alter feed intake, however, increased not significantly (P = 0.086) average daily gain (ADG) and N retention. Plasma cortisol level was reduced by 10 %, and feed utilization efficiency was improved by 12 % in 0.5 mg Cr/kg DM-supplemented group compared to the control. Thus, 0.5 mg Cr/kg DM dietary supplementation to camel calves reared under hot summer condition increased weight gain by 17 % and reduced feeding cost of producing a unit of weight by 11 %.
机译：干旱和半干旱地区骆驼生产中最重要的问题之一是采食量减少，进而导致夏季生长率低。在这些压力大的环境条件下，在成长中的骆驼犊牛的饮食中补充铬（Cr）可能是有益的。因此，本研究的目的是评估饲喂添加不同含量Cr的饮食对在炎热干旱环境下饲养的骆驼犊牛生长性能的影响。本研究共使用15只雄性骆驼犊牛（4-5个月大，体重123 +/- 7 kg）。将动物分成三个相等的组（A，B，C），每组5只动物，并单独安置在庇护所中。随意给骆驼犊喂食不添加铬的总混合日粮（TMR）（A组），补充0.5 mg Cr / kg DM的TMR（B组）或补充1.0 mg Cr / kg DM的TMR（C组） 。在骆驼犊牛的日粮中添加0.5 mg Cr / kg DM不会改变采食量，但是平均日增重（ADG）和氮保持量却没有显着增加（P = 0.086）。与对照组相比，补充0.5 mg Cr / kg DM的组血浆血浆皮质醇水平降低了10％，饲料利用率提高了12％。因此，在炎热的夏季条件下饲养的骆驼犊牛添加0.5 mg Cr / kg DM饮食，可使体重增加增加17％，将单位重量的饲料成本降低11％。

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