Degradabilidade ruminal e parâmetros da fermentação em dietas contendo silagem de cana-de-açucar e caroço de algodão

Abstract

The aim of this study was to evaluate the inclusion of increasing levels (0, 5, 10 and 15%) of cottonseed to a basic diet of silage cane sugar made with 1% urea in dry matter basis and concentratecomposed of corn and cottonseed meal. We evaluated the parameters and kinetics, the parameters of in situ dry matter of silage from sugar cane, was also evaluated the effectiveness and titanium dioxide inthe estimates of external indicators LIPEÒ of total consumption. Four dairy cows crossbred Holstein cows fitted with rumen cannulae, in a randomized Latin Squares 4 x 4 in 3.3 kg of milk± 25 days) andaverage production of 11.1 ± early lactation (60 / day. Among the parameters of fermentation and kinetics, only the ruminal concentration (mMoles/100 ml) and the molar ratio (%) of propionate werenot influenced (P> 0.05) treatments. Among the parameters of in situ dry matter, both the rate of degradation (c) (0.0458, 0.0372, 0.033 and 0.0147 / h) as the effective degradability (DE) for a passage rate of 3 9% (44.26, 46.06, 44.53, and 38.74%) for treatments with 0, 5, 10 and 15%cottonseed, respectively, their values decreased with the addition of lump cotton at a significance level of 5%. Daily consumption of dry matter was not affected (P> 0.05) the addition of cottonseed at levelsequal to or greater than 15% of the diet (12.4, 12.2, 13.1 and 10.9 kg / days or 2.4, 2.4, 2.6 and 2.2% body weight / day) for treatments with 0, 5, 10 and 15% cottonseed, respectively. and External indicators LIPEÒ titanium dioxide were adequate to estimate the intake of cows, regardless of diet offered, both showed that external indicators can be a substitute for chromic oxide, therefore, estimates of consumption provided they did not differ (P > 0.05) in consumption observed in thetrough.