The Impact of Adaptive Performance on Holstein Breeding in Northern Thailand

Statusanalyse der Zucht- und Produktionsstrukturen incl. Adaptationsleistung in der Milchviehzucht Nordthailands für die Entwicklung eines eigenständigen Besamungszuchtprogramms für die lokale Holsteinzucht erhoben auf 252 Milchviehbetrieben mit 2764 Kühen

MILK YIELD, MILK COMPOSITION AND BLOOD METABOLITE PROFILES IN DAIRY COWS SUPPLEMENTED WITH VITAMIN D ENRICHED YEAST

The purpose of this study was to evaluate the effect of vitamin D enriched yeast supplementation on milk performance, vitamin D content in milk, and blood metabolite profiles. Six crossbred Holstein Friesian cows were randomly allocated to treatment by using a 3 x 3 Double Latin square design, including a control group (T1), 5 g live yeast supplementation (T2), and 5 g vitamin D enriched yeast supplementation (160,000 IU/head/day; T3). Milk and blood samples were collected on days 28 of each trail period, for analyzing milk composition, vitamin D content in milk, and blood metabolite profiles. The result showed that the vitamin D enriched yeast supplementation group had 25-hydroxyvitamin D2 concentration in blood significantly higher than other comparable groups (64.27 compared to 47.39 and 49.31 ng/ml, respectively; P < 0.01). There were no significant differences between treatments for milk yield or ECM yield and milk composition but the vitamin D enriched yeast supplementation group had significantly higher vitamin D content in milk than the T1 and T2 groups (690.83 compared to 562.83 and 529.48 ng/1000mL, respectively; P < 0.01). As a result, supplementing vitamin D enriched yeast with dairy cow diets cloud improve vitamin D content in milk