Supplementation of cassava hay as a protein replacement for soybean meal in concentrate supplement for dairy cows
2007
Wanapat, M. | Promkot, C | Wanapat, S. | Rowlinson, P.
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 3x3 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 ruminal. ammonia nitrogen (NH3-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.
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