Desempenho, parâmetros digestivos e cinética ruminal de vacas Jersey suplementadas com TOSANA

Abstract

The objective was to evaluate the effect of chitosan on the performance, digestive parameters and ruminal kinetics of Jersey cows. Four Jersey cows, multiparous, cannulated in the rumen [mean days of lactation = 150 ± 45 days; and production of 22.2 ± 4.5 kg/day, body weight = 350 ± 25 kg], were fed two diets, distributed in a crossover design. Each period lasted 17 days, the first 7 of which were for adaptation to the diets and the others for data collection and Exception. The experimental diets were randomly distributed to the animals, these diets were: 1) Control (CON), consisting of basal ration without the inclusion of chitosan; 2) Basal diet with the inclusion of chitosan (0.02% of total DM or 4g/kg of DM consumed). There was no effect of diets on nutrient intake and digestibility (P>0.05). Likewise, no effect of diets was observed on milk production, corrected milk production, as well as on fat, protein, lactose and total and non-fat dry extracts (P>0.05). There was no effect of diets on variables related to animal performance (P>0.05). In general, the inclusion of chitosan did not change the profile of dietary recipes in cows' milk, with the exception of milk concentrations of C18:1 cis-11 (P = 0.025) which were reduced in cows fed the diet containing this additive. . Due to the lack of effect on animal intake, no significant results were found for variables related to energy balance (net and digestible energy intake, net energy for gain and lactation, energy balance, as well as efficiencies (P>0 Likewise, there was no effect of the diets on the variables of ruminal characterization and omasal flow of nutrients (P>0.05). , such as dry matter (DM) digestion rate, ruminal DM formula, organic matter and fiber in indigestible neutral detergent (NDF), as well as in passage rates of DM and potentially digestible NDF (P>0.05) The inclusion of chitosan did not promote changes in milk production and composition, in parameters of rumen dynamics and in balance of Jersey vacation energy