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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.18.0735    [Accepted] Published online February 7, 2019.
Lactation performance and rumen fermentation in dairy cows fed a diet with alfalfa hay replaced by corn stover and supplemented with molasses
Zi-Hai Wei1, Shu-Lin Liang1, Di-Ming Wang1, Hong-Yun Liu1, Metha Wanapat2, Jian-Xin Liu1,* 
1Institute of Dairy Science, College of animal Science, Zhejiang University, Hangzhou 310058, China
2Tropical Feed Resources Research and Development Center (TROFREC), Department of Animal Science, Faculty of Agriculture, Khon Kaen University, Khon Kaen 40002, Thailand
Correspondence:  Jian-Xin Liu, Tel: +86-571-88982097, Fax: +86-571-88982097, Email: liujx@zju.edu.cn
Received: 30 September 2018   • Revised: 13 October 2018   • Accepted: 8 January 2019
Abstract
Objective: The objective of current study was to investigate the lactation performance and rumen fermentation characteristics of dairy cows fed a diet with alfalfa hay replaced by corn stover but supplemented with molasses.

Methods

Sixteen Holstein cows in mid-lactation were randomly assigned to 1 of 2 dietary treatments: (1) alfalfa based diet (AH), and (2) corn stover based diet supplemented with molasses (CSM). The experiment was conducted according to a 2 × 2 crossover design with 22-d period, each period consisting of 17 d for adaptation and 5 d for data and samples collection.

Results

Dry matter intake and milk yield were higher for cows fed AH than CSM (P < 0.01). Milk protein content and nitrogen conversion was higher (P < 0.05), while MUN was lower (P < 0.01) for cows fed AH than CSM-fed cows. Contents of milk total solids, fat and lactose were not different between two groups (P > 0.10). Total rumen VFA concentration tended to be higher (P = 0.06) for cows fed AH than CSM-fed cows. Molar proportion of acetate was lower (P = 0.04), but valerate was higher (P = 0.02) in cows fed AH than CSM-fed cows. Rumen concentration of propionate, and isobutyrate, and ratio of acetate to propionate tended to be different (P < 0.10) between two groups. The feed cost per kilogram of milk was lower in CSM than AH (P < 0.01). No differences were found in feed efficiency and most plasma parameters tested (P > 0.10).
Conclusion
In comparison with AH diet, CSM diet could be fed to dairy cows without negative effect on feed efficiency, ruminal fermentation, but beneficial for economic merit, indicating that CSM could be an alternative choice for dairy farms instead of AH to feed mid-lactation dairy cows.
Keywords: Alfalfa Hay; Corn Stover; Dairy Cows; Lactation Performance; Molasses
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