Abstract
The purpose of this study was to investigate the effects of four types of diets containing different forms of selenium on the hematological blood parameters, reproduction and health of dairy cattle during the transition period. Twenty-four close-up dry cows with a mean of 259 ± 1days of pregnancy and expected 21 ± 1days prior to parturition were selected. The cows were fed four diets: 1) basal diet without selenium supplementation (C); 2) basal diet plus 0.5ppm selenium in the form of sodium selenite (Se-S) 3) basal diet plus 0.5ppm selenium in the form of selenium yeast (Se-Y); 4) basal diet plus 0.5ppm selenium in the form of selenomethionine (Se-M). Blood samples for measuring hematological blood parameters (including lymphocyte, red blood cells, hemoglobin, and hematocrit, MCV, MCH, MCHC and RDWc) were taken at 21 and 10 days before delivery, delivery date, 10 and 21 days after delivery. There was no significant difference in hematological parameters before and after delivery in experimental and control groups. However, in the prepartum period, MCH tended to increase significantly in selenium methionine treatment (p<0.05). Reproductive parameters (including distance to first estrus, insemination indexes and number of open days) and health parameters (including rectum temperature and vaginal content score) have been improved by selenium organic supplements. The results of this experiment showed that feeding organic selenium supplementation in multiparous dairy cow’s diet may improve their health and reproduction.
Highlights
Selenium is an important trace mineral and selenium deficiency has a negative effect on the health of humans and animals (Alfthan et al, 2015; Hatfield, Tsuji, Carlson, & Gladyshev, 2014)
Foods can be supplemented with selenium in two forms, an inorganic form such as sodium selenite and sodium selenate or an organic form such as selenium yeast and selenium methionine
The aim of this study is to investigate the effects of selenomethionine, selenium yeast and sodium selenium supplements on hematological blood parameters, reproduction and health of dairy cows in the transition period
Summary
Selenium is an important trace mineral and selenium deficiency has a negative effect on the health of humans and animals (Alfthan et al, 2015; Hatfield, Tsuji, Carlson, & Gladyshev, 2014). Foods can be supplemented with selenium in two forms, an inorganic form such as sodium selenite and sodium selenate or an organic form such as selenium yeast and selenium methionine. The metabolism of these two forms is different in animals. Organic selenium is absorbed through active transmission in the small intestine and in the synthesis of proteins; it is stored instead of methionine in tissues. It provides a source of selenium in the organs and tissues (Schrauzer, 2003). In recent years, the shift in supplements from the form of inorganic selenium (sodium selenite) to organic forms (selenium yeast and selenium methionine) is further emphasized
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