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https://doi.org/10.5713/ab.23.0013    [Accepted] Published online May 4, 2023.
Effect of UV-B irradiated vitamin D enriched yeast supplementation on milk performance and blood chemical profiles in dairy cows
Patipan Hnokaew1  , Tossapol Moonmanee1,2  , Chirawath Phatsara1  , Nattaphon Chongkasikit1  , Prayad Trirawong1,3  , Lukman Abiola Oluodo1,4  , Saowaluck Yammuan-Art1,2,* 
1Department of Animal and Aquatic Sciences, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand
2Innovative Agriculture Research Center, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand
3Department of Animal Science, Faculty of Agriculture at Kamphaeng Saen, Kasetsart University, Nakhon Pathom 73140, Thailand
4Outreach Department, Rubber Research Institute of Nigeria, Benin City, 1069, Nigeria
Correspondence:  Saowaluck Yammuan-Art, Tel: +66-053944070, Fax: +66-053357601, Email: saowaluck.y@cmu.ac.th
Received: 13 January 2023   • Revised: 29 March 2023   • Accepted: 1 May 2023
Abstract
Objective
The objective was to evaluate the effects of UV-B irradiated vitamin D-enriched yeast supplementation on milk yield, milk composition, vitamin D in milk, milk fatty acids, blood chemistry, and 25(OH)D status in dairy cows.
Methods
Six Thai Friesian cows, milk production (11.2 ± 2.0 kg/day), body weight (BW; 415.0 ± 20.0 kg), and days in milk (DIM; 90.0 ± 6.0), were allocated to each treatment in a 3 × 3 Latin square design, with three treatments and three periods. Each period of the Latin square lasted 49 days consisting of 14 days for diet adaptation and 35 days for sample collection. Dairy cows were randomly assigned to one of three treatments: (1) feeding a basal diet without yeast (CON), (2) basal diet + 5 g of live yeast (75 IU/head/day of vitamin D2; LY), and (3) basal diet + 5 g of UV-B irradiated vitamin D enriched yeast (150,000 IU/head/day of vitamin D2; VDY). Feed intake and milk production were recorded daily, milk sample collection occurred on days 14 and 35 of each collection period, and blood plasma was collected on days 0, 7, 14, 21, 28, and 35 of each collection period.
Results
The results show that after a trial period of 14 and 35 days, the VDY group had significantly higher vitamin D content in milk than the LY and CON groups (376.41 vs. 305.15, 302.14 ng/L and 413.46 vs. 306.76, 301.12 ng/L, respectively). At days 7, 14, 21, 28, and 35 of the experiment, cows fed the VDY group had significantly higher 25(OH)D2 status in blood than the CON and LY groups (51.07 vs. 47.16, 48.05 ng/mL; 54.96 vs. 45.43, 46.91 ng/mL; 56.16 vs. 46.87, 47.16 ng/mL; 60.67 vs. 44.39, 46.17 ng/mL and 63.91 vs. 45.88, 46.88 ng/mL), respectively
Conclusion
In conclusion, UV-B irradiated vitamin D-enriched yeast supplementation could improve vitamin D content in the milk and 25(OH)D status in dairy cows during the lactation period.
Keywords: Blood Chemical Profiles; Dairy Cows; UV-B Irradiated Vitamin D Enriched Yeast; Vitamin D in Milk


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