Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 401915
Title Effect of feeding rumen-protected rice bran on mineral status of non-lactating dairy heifers
Author(s) Martin-Tereso Lopez, J.; Distefano, C.; Laar, H. van; Mulder, K.; Hartog, L.A. den; Verstegen, M.W.A.
Source Journal of Animal Physiology and Animal Nutrition 95 (2011)1. - ISSN 0931-2439 - p. 73 - 80.
DOI https://doi.org/10.1111/j.1439-0396.2010.01006.x
Department(s) Animal Nutrition
Livestock Research
WIAS
Publication type Refereed Article in a scientific journal
Publication year 2011
Keyword(s) zeolite-a supplementation - magnesium absorption - dry period - phosphorus - cows - calcium - phytate - homeostasis - metabolism - zinc
Abstract Adapting Ca homeostasis of dairy cows before calving can prevent milk fever. Rice bran, treated with formaldehyde to prevent ruminal degradation of phytic acid, was fed to heifers to study its effect on Ca homeostasis. For 3 weeks 18 heifers were supplemented 3 kg of two feeds: placebo (PF) and rice bran (RBF), defining three treatments: control (CRT), low dose (LD) and high dose (HD). In weeks 1 and 3, all animals received 3 kg of PF and in week 2: CRT received 3 kg of PF, LD received 1.5 kg of PF and 1.5 kg of RBF and HD received 3 kg of RBF. Treatments did not affect dry matter intake (DMI). Feed intakes and growth rates indicated that all heifers had nutritional requirements that exceeded their Ca intakes. Serum Ca, urinary Ca, calcitriol or hydroxyproline remained unaffected. Urinary Ca was consistently low indicating high renal Ca reabsorption, which is indicative of insufficient Ca supply. Rice bran feed influenced P, Mg and Zn intakes and serum and urine presence of these minerals. Most heifers already presented an upregulated Ca metabolism, being inadequate to study adaptive changes in Ca homeostasis of multiparous dry cows. This metabolic difference can be explanatory to the very low susceptibility of heifers to milk fever, further supporting the induction of homeostatic adaptation before calving to prevent milk fever. Rice bran feed did not reduce DMI, and was not detrimental to P, Mg or Zn status.
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