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Lookup NU author(s): Dr Peter Rowlinson
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Crossbred Holstein-Friesian dairy cows (3) in mid-late lactation were randomly allocated to 3 ratio of cassava hay (CH) and soybean meal (SBM) (CH:SBM) in concentrate supplement treatments (0:100, 60:40, 100:0) according to a 3×3 latin square design. Concentrate mixture containing 16% CP was given to animals at 2 equal parts (2% of body weight/day) while urea-treated rice straw (5% urea) (UTRS) was given on ad lib. The experiment revealed that increasing CH: SBM ratio in concentrate had no effect on dry matter intake and digestibility while reduced concentrations of ruminai ammonia nitrogen (NH 3-N) and blood urea nitrogen (BUN) were reduced. Milk yield across treatments were similar (8.0-8.5 kg/hd/d) while fat contents of milk tended to linearly increase as ratio of CH to SBM in concentrate increased. Moreover, increasing levels of CH to SBM ratio in concentrate linearly increased income over feed, thus resulted in more milk income return. Conclusions can be made that CH should be recommended to be used as a protein source replacement for soybean meal in concentrate for a sustainable dairy production in the tropics.
Author(s): Wanapat M, Promkot C, Wanapat S, Rowlinson P
Publication type: Article
Publication status: Published
Journal: Indian Journal of Animal Sciences
Print publication date: 01/12/2007
ISSN (print): 0367-8318
Publisher: Indian Council of Agricultural Research