Chromium, Newly Discovered and Other Trace Elements

McDowell, L. R.

doi:10.1016/b978-0-444-51367-0.50019-2

Cited by 2 publications

(1 citation statement)

References 91 publications

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“…Also, dietary Cr supplementation has a positive effect on growth rate and feed efficiency in poultry [Cupo and Donaldson, 1997;NRC, 1997 andSahin et al, 2001). Besides, Cr plays essential roles for normal metabolism of carbohydrates, proteins and lipids in human and livestock (McDowell, 1992). Most authors agree that Cr supplementation during periods of increased stress has a positive effect on weight gain.…”

Section: Introductionmentioning

confidence: 99%

Physical Semen Characteristics of California Rabbit Bucks Administrated With Different Chromium Levels

Dorra

El-Serwy

Ismail

et al. 2007

Journal of Animal and Poultry Production

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The experimental work was carried out in the Rabbit Production Farm, Agricultural Researches and Experiments Station, Faculty of Agriculture, Mansoura University, during the period from February to Augusts 2006. A total of 12 sexually mature California bucks having 6-8 months of age and 3.0-3.5 kg live body weight) was used in this study. Bucks were healthy, free of diseases and external parasites. The experimental bucks were divided into three groups (4 males in each group) according to treatment. Bucks in the 1st Group served as control. However, group 2 and 3 were given chromium picolinate (9 and 18 μg/kg body weight) respectively. The bucks were given the dose orally every day as a suspend buck. To determine mass motility, progressive motility, Sperm cell concentration, Percentage of dead spermatozoa, percentage of abnormal spermatozoa was recorded. Results show that ejaculate volume of rabbit bucks significantly (P<0.05) decreased in both treated groups as compared to control group. This reduction was higher with low than high Cr dose, being about 12.5 and 8.6%, respectively. The obtained results revealed a negative effect of Cr treatment on ejaculate volume of rabbit bucks. Mass motility or percentage of progressive motility was significantly (P<0.05), being positive for the low level (9 µg/kg) and negative for the high level (18 µg/kg) of Cr. Level of 9 µg/kg significantly (P<0.05) increased score of mass motility by about 24% and progressive motility by about 34%, however, level of 18 µg/kg significantly (P<0.05) decreased score of mass motility by about 16% and progressive motility by about 22% as compared to controls. Dead sperm percentage was significant (P<0.05), being lower by about 17% for the low level (9 µg/kg) and higher by about 4% for the high level as compared to the control group (18 µg/kg) of Cr. Percentage of sperm abnormality was affected significantly (P<0.05) by the low Cr level, but was not affected by the high level of Cr. Sperm abnormality percentage significantly (P<0.05) reduced by about 48% as compared to the control group. Sperm cell concentration (x10 6 /ml) significantly (P<0.05) increased by about 37% in low Cr group, but was not affected by the high level of Cr. However, total sperm output (x10 6 /ejaculate) significantly (P<0.05) increased by about 16.5% in low Cr group and reduced by about 10% in high Cr group as compared to the control group.

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Section: Introductionmentioning

confidence: 99%

Physical Semen Characteristics of California Rabbit Bucks Administrated With Different Chromium Levels

Dorra

El-Serwy

Ismail

et al. 2007

Journal of Animal and Poultry Production

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Effects of chromium supplementation on selected metabolic responses in resting and exercising horses

Vervuert

Cuddeford

Coenen

2006

Equine Comp. Exerc. Physiol.

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Link to this article: http://journals.cambridge.org/abstract_S1478061506000041How to cite this article: I Vervuert, D Cuddeford and M Coenen (2006). Effects of chromium supplementation on selected metabolic responses in resting and exercising horses. AbstractChromium (Cr) is required for insulin function in the control of cellular glucose uptake. Other functions of Cr relate to its effects on growth, lipid metabolism, immune responses and interactions with nucleic acids. This study was conducted to obtain information on the effect of Cr supplementation on the metabolic responses of five exercising Standardbred horses. During the experiment, horses were fed every day for a 21-day period in a randomized order either a yeast product without Cr (control) or with 4.15 or 8.3 mg Cr day 21 . Horses were exercised on a treadmill, alternating a work day of low-speed exercise at 5 m s 21 on a 3% incline for 45 min with a rest day. Each horse was adapted over a 21-day period to his or her respective supplementation before undergoing a standardized exercise test (SET). The SET comprised five incremental steps, each of 4 min duration, on a treadmill with a 3% incline; the first step was at 5 m s 21 and was followed with increments of 1 m s 21 . Blood samples were taken for lactate, plasma glucose, serum insulin and cortisol estimation before, during and after each SET (30, 120 min and 24 h post-exercise). Blood Cr was estimated 2 h after feeding the control or Cr-enriched yeast (intake 8.3 mg Cr) in two horses. Heart rate was monitored throughout each SET. Blood lactate and plasma glucose peaks were highest at 8 and 9 m s 21 during the SET when 8.3 mg Cr was supplied. Serum insulin levels declined during the SET and there were no treatment-related changes. Twenty-four hours after exercise, plasma glucose and serum cortisol concentrations returned to basal levels or lower. Serum insulin rebounded 30 min after exercise but 24 h later, serum insulin concentrations were below resting levels. During the recovery period, Cr supplementation did not clearly affect metabolic responses. These results suggest that Cr supplementation had no beneficial effect in healthy, exercising horses.

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Chromium, Newly Discovered and Other Trace Elements

Cited by 2 publications

References 91 publications

Physical Semen Characteristics of California Rabbit Bucks Administrated With Different Chromium Levels

Physical Semen Characteristics of California Rabbit Bucks Administrated With Different Chromium Levels

Effects of chromium supplementation on selected metabolic responses in resting and exercising horses

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