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The utilization of high non protein nitrogen supplements in forage rations 3. effects of in situ digestibility of pangola grass digitaria decumbens



The utilization of high non protein nitrogen supplements in forage rations 3. effects of in situ digestibility of pangola grass digitaria decumbens



Cuban Journal of Agricultural Science 19(2): 153-159



Three 470 rumen cannulated Holstein cows were used in a factorial 3 .times. 2 arrangement to study the effect of the type of supplement on in situ pasture digestibility. The experiment was carried in three months of the year: May and September, a control without supplement compared to two nitrogenous supplement (one with 100% and another with 77% of crude protein as NPN); in November, a control with grain concentrates compared to the previously mentioned supplements. No interactions were found in digestibility. In May this was 61,4 vs. 66,8 and 66,9% (P < 0,01) and 73,9 vs. 56,2% in September 41,2 vs. 53,8 and 51,7% (P < 0.01) and 58,3 vs 43,5% and in November 56,7 vs 61,4 and 60,3% (P < 0.001) and 66,0 vs 53,0% according to the type of supplement and occupation days, respectively. The consumption of both nitrogenous supplements improved DM digestibility of the pasture consumed and there was an apparently greater response when the initial digestibility was low, an aspect which requires further study.

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