Milk selenium content and speciation in response to supranutritional selenium yeast supplementation in cows |
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| Authors: | Lingling Sun Gentao Liu Dongmei Xu Zhaohai Wu Lu Ma Sanz-Fernandez M Victoria Lance H Baumgard Dengpan Bu |
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| Institution: | State Key Laboratory of Animal Nutrition,Institute of Animal Sciences of Chinese Academy of Agricultural Sciences,Beijing 100193,China;Comparative Physiology Group,Subdireccion General de Investigacion y Tecnologia (SGIT),Institato Nacional de Investigation y Tecnologia Agraria y Alimentaria (INIA),Madrid 28040,Spain;Department of Animal Science,Iowa State University,Ames 50014,USA;State Key Laboratory of Animal Nutrition,Institute of Animal Sciences of Chinese Academy of Agricultural Sciences,Beijing 100193,China;CAAS-ICRAF Joint Lab on Agroforestry and Sustainable Animal Husbandry,Beijing 100193,China;Hunan Co-Innovation Center of Animal Production Safety,CICAPS,Changsha,Hunan 410128,China |
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| Abstract: | The effects of selenium (Se) yeast supplementation on performance, blood biochemical and antioxidant parameters, and milk Se content and speciation were evaluated. Thirty-six mid-lactation Holstein dairy cows were randomly assigned to 1 of 3 treatments: 1) control (basal diet containing Se at 0.11 mg/kg DM), 2) basal diet + 0.5 mg supplemental Se/kg DM (SY-0.5), and 3) basal diet + 5 mg supplemental Se/kg DM (SY-5). Selenium was supplemented as Se yeast. The trial consisted of a 1-week pretrial period and an 8-week experimental period. Milk somatic cell score decreased with SY-5 supplementation (P < 0.05), but other performance parameters were not affected (P > 0.05). The serum Se concentration increased with the increasing levels of Se yeast supplementation (P < 0.05), however, blood biochemical parameters showed few treatment effects. The antioxidant capacity of dairy cows was improved with Se yeast supplementation reflected in increased serum glutathione peroxidase activity (P < 0.05) and total antioxidant capacity (P = 0.08), and decreased malondialdehyde concentration (P < 0.05). Milk total Se concentration increased with Se dose (P < 0.05). Also, the selenomethionine concentration increased with Se dose from 13.0 ± 0.7 μg/kg in control to 33.1 ± 2.1 μg/kg in SY-0.5 and 530.4 ± 17.5 μg/kg in SY-5 cows (P < 0.05). Similarly, selenocystine concentration increased from 15.6 ± 0.9 μg/kg in control and 18.9 ± 1.1 μg/kg in SY-0.5 to 22.2 ± 1.5 μg/kg in SY-5 cows (P < 0.05). In conclusion, Se yeast is a good organic Se source to produce Se-enriched cow milk with increased Se species including selenomethionine and selenocystine. The results can provide useful information on milk Se species when a high dose Se yeast was supplemented in the cow diet. |
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| Keywords: | Dairy cow Selenium yeast Selenium speciation Milk performance |
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