Abstract
The purpose of this study was to evaluate the effects of sweet potato vine pellet (SWEPP) in concentrate diets on nutrient digestibility and rumen ecology in lactating dairy cows fed on urea-treated rice straw. Three multiparous Holstein crossbred cows in mid-lactation were randomly assigned according to a 3 × 3 Latin square design, and the treatments were as follows: T1 = control (no supplementation), T2 = supplementation of sweet potato vine pellet with 50 g/kg urea (SWEPP I) at 300 g/head/day, and T3 = supplementation of sweet potato pellet with 100 g/kg urea (SWEPP II) at 300 g/head/day, in concentrate diets, respectively. The result revealed that supplementation of SWEPP did not affect feed intake, ruminal pH, and blood urea nitrogen (P > 0.05). However, apparent digestibilities of organic matter, crude protein, and neutral detergent fiber were higher in SWEPP II than those in others. Furthermore, ruminal ammonia nitrogen (NH3-N) and milk yield were significantly higher (P < 0.05) in animals fed with SWEPP II than those fed with SWEPP I and control, respectively. In addition, there were no differences in purine derivatives and microbial nitrogen supply among all the treatments. Based on this study, it could be concluded that SWEPP is a good source of supplement which resulted in significant improvement in apparent digestibility, rumen fermentation, and milk yield in lactating dairy cows fed on urea-treated rice straw.
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Acknowledgments
The authors would like to express their most sincere thanks to all who have assisted and supported this study, particularly the Tropical Feed Resources Research and Development Center (TROFREC), Department of Animal Science, Faculty of Agriculture, Khon Kaen University, Khon Kaen, Thailand; the Royal Golden Jubilee Ph. D. Scholarship Program; and the Dairy Promotion Organization of Thailand (DPO), Northeast Region, for their active collaborations and support.
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Phesatcha, K., Wanapat, M. Performance of lactating dairy cows fed a diet based on treated rice straw and supplemented with pelleted sweet potato vines. Trop Anim Health Prod 45, 533–538 (2013). https://doi.org/10.1007/s11250-012-0255-5
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DOI: https://doi.org/10.1007/s11250-012-0255-5