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首页> 外文期刊>Archives of Animal Nutrition >Effects of chromium supplementation on weight gain, feeding behaviour, health and metabolic criteria of environmentally heat-loaded Holstein dairy calves from birth to weaning
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Effects of chromium supplementation on weight gain, feeding behaviour, health and metabolic criteria of environmentally heat-loaded Holstein dairy calves from birth to weaning

机译：铬补充对生成的重量增益，饲养行为，健康和代谢标准从出生到断奶的重量增益，饲养行为，健康和代谢标准

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The objectives of this study were to investigate the effects of chromium (Cr) supplementation on feed intake and meal pattern, weight gain and skeletal growth, and health and metabolic criteria of environmentally heat-loaded dairy calves during the pre-weaning period. Forty-eight newborn female calves were allotted randomly to a control group (no Cr supplement; Cr-) or a Cr group (Cr+) receiving 0.05 mg Cr (as Cr-methionine)/kg BW0.75. Cr was provided in the liquid feed (colostrum and milk) during the pre-weaning period. The average maximum temperature-humidity index was 83.7 U, indicating severe environmental heat load. Despite reduced meal frequency and increased in inter-meal interval, Cr supplementation tended to increase starter feed intake and total dry matter intake as a result of increased meal size and duration. Respiration rate was lower in Cr+ calves. Calf growth, rectal temperature, faecal score and incidence of diarrhoea or pneumonia were not affected by Cr supplementation, but number of days with diarrhoea and treatment duration decreased during the pre-weaning period. Cr supplementation tended to increase resting time and decreased time devoted to non-nutritive oral behaviours. At weaning, serum concentration of glucose was lower but total protein and globulin concentrations were higher in Cr+ calves. In Cr+ calves, the activity of glutathione peroxidase was higher and lower on d 49 and 63 of the study, respectively, compared to the control calves. Activity of catalase was increased on d 21 and tended to decrease on d 35 in Cr+ calves. In general, Cr supplementation to environmentally heat-loaded dairy calves decreased non-nutritive oral behaviours, improved feed intake and decreased days with diarrhoea and treatment duration, but had minimal effects on weight gain, metabolism and indicators of oxidative stress or insulin function.
机译：本研究的目的是探讨铬（CR）补充在预断奶期间对环境加热乳制品牛犊的饲料摄入和膳食模式，体重增加和骨骼生长，体重增加和骨骼生长的影响。将四十八个新生儿女性小腿随机分配给对照组（无CR补充; CR-）或接受0.05mg Cr（作为Cr-Methionine）/ kg BW0.75的Cr组（Cr +）。在预断奶期间，在液体饲料（初乳和牛奶）中提供Cr。平均最大温度湿度指数为83.7 U，表明严重的环境热负荷。尽管膳食频率降低并在膳食间间隔中增加，但由于膳食大小和持续时间增加，CR补充趋于增加起动进料摄入和总干物质摄入量。 Cr +犊牛的呼吸率较低。小牛生长，直肠温度，粪便或肺炎的发病率不受Cr补充的影响，但在断奶前期间，腹泻和治疗持续时间的天数减少。 CR补充倾向于增加休息时间和致力于非营养口腔行为的减少时间。在断奶时，血清浓度较低，但Cr +犊牛的总蛋白质和球蛋白浓度较高。在Cr +犊牛中，与对照犊牛相比，谷胱甘肽过氧化物酶的活性分别较高，D 49和63的活性较低，并且与对照犊牛相比，研究。在D 21上增加过氧化氢酶的活性，并倾向于在Cr +犊牛中降低D 35。一般而言，对环境加热乳制品犊牛的CR补充性降低了非营养口腔行为，改善了进料摄入量和随着腹泻和治疗持续时间减少的日子，但对体重增加，代谢和氧化应激或胰岛素功能的指标具有最小的影响。

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