The effect of feeding inorganic and organic selenium sources on the performance and content of selenium in milk of transition dairy cows

Abstract

The aim of this study was to determine the effects of supplementing close-up and fresh dairy cows' diets with sodium selenite or organic sources of selenium (Se) on the dry matter intake (DMI), milk production and composition. Based on their body condition score (BCS), previous lactation milk yield and expected calving date, 24 multiparous Holstein dairy cows were balanced and randomly assigned to 4 experimental treatments. Experimental treatments were: control (basal diet without Se supplementation with 0.10 and 0.15 mg of Se kg-1 DM in close-up and fresh diets, respectively), sodium selenite supplementation (0.50 mg of Se kg-1 DM; Se-S), selenium yeast supplementation (0.50 mg of Se kg-1 DM; Se-Y) and selenomethionine supplementation (0.50 mg of Se kg-1 DM; Se-M). Neither Se supplementation nor Se source affected DMI pre-and postpartum. Milk production and composition were not different across Se sources, but concentrations of Se in milk were 14 and 10% greater for cows fed Se-M and Se-Y than for those fed control, respectively. Cows fed Se-M had lower somatic cell count than control (SCC; 173.11 vs. 318.89 cells × 10 3 Ml-1). The changes of BW and BCS pre-and postpartum were not affected by treatments over experimental period. The results of present study showed that selenomethionine supplementation compared to other sources decreased SCC in transition cows. In addition, milk Se concentrations increased in Se-Y and Se-M groups more significantly compared to the Se-S group. This indicates that organic Se had better replace inorganic Se for transition dairy cows.

Sensory Attributes, Microbial Activity, Fatty Acid Composition and Meat Quality Traits of Hanwoo Cattle Fed a Diet Supplemented with Stevioside and Organic Selenium

“…In contrast, Cho et al [ 43 ] reported that the dietary intake of Hanwoo steers is not influenced by the inclusion of 65 mg/kg stevioside as an essential oil to the feed with 0.1% of diet supplemented rate. Furthermore, previous studies reported improved production parameters in pigs [ 44 ], layers [ 45 ], broilers [ 46 ], and cattle [ 47 ] owing to O-Se supplementation. The enhanced production performance may be associated with the developed antioxidant capacity and decrease in microbial pathogen colonization in the gut system because of the synergistic action of S and O-Se supplementation.…”

Effects of organic and inorganic selenium on selenium bioavailability, growth performance, antioxidant status and meat quality of a local beef cattle in China

“…Moreover, Se supplementation promotes growth ( 5 ), reproduction ( 6 ), milk yield and quality in cattle ( 7 ). In addition to meeting animal requirements, Se supplementation in feed can also increase Se content of animal products, which is considered an important intervention in minimizing the risk of Se deficiency in humans ( 8 , 9 ). China is one of the 40 countries designated low Se or Se deficient according to the World Health Organization (WHO), and Se-deficient areas account for 72% of the country’s total area, which affects over 70 million people who face potential adverse health impacts due to Se deficiency ( 10 , 11 ).…”

Plasma and Colostrum Selenium Statuses of Properly Supplemented Belgian Blue Cows on Commercial Farms and their Relationship with Source of Dietary Selenium and Blood Biomarkers.

“…Se in beef cattle has been studied to a lesser extent than in dairy cattle, especially regarding Se status in colostrum and the relationship between Se and blood parameters [12,13]. In particular, little studies have been conducted on Se in the Belgian Blue cattle breed in commercial farms, which is a predominant beef breed in Belgium.…”