Efeitos da monensina sódica na dieta sobre o perfil bioquímico sérico, desempenho e digestibilidade de ovinos no Semiárido Brasileiro.

Abstract

The objective of this study was to evaluate the influence of different levels of monensin in diet on the physiological response and performance of crossbred sheep ½Dorper + ½Santa Inês in confinement in the semiarid region. The work was conducted at Sheep Research Center sector for the development of semi-arid, the Center for Health and Rural Technology, Federal University of Campina Grande, Campus of Patos- PB. Twenty four crossbred sheep were used uncastrated male with a mean age of 5  1 month, 3 body score and initial weight of 23.3  3.5 kg. The animals were everminados vaccinated against clostridial diseases and kept confined in individual pens measuring 0.80 x 1.20 m, with free access to the feeder and drinker. And they went through an adjustment period of 15 days to the management and diet, and 60-day trial, totaling 75 days. The experimental design was a randomized complete block design with four treatments and six replications, in which the blocks were formed by animals according to the initial weight. a standard diet consisting of 60% forage and 40% concentrate, distributed in four treatments was used: T1 = only the standard diet, T2 = standard diet + 30 mg/animal day of monensin, T3 = diet standard + 60 mg/animal day of monensin and T4 = standard diet + 90 mg/animal day of monensin. Analysis of variance revealed no significant effect (p>0.05) between treatments for liver enzymes, aspartate aminotransferase (AST) and glutamyl Range (GGT), minerals, potassium, sodium, chloride, calcium, phosphorus and serum albumin, glucose and total protein. For urea and β-hydroxybutyrate regression equation showed a positive linear effect (p <0.05) as they increased the amount of monensin in the diet. The different levels of monensin in the diet had no effect on the consumption of dry matter (DM), crude protein (CP), metabolizable energy (ME), mineral matter (MM), neutral detergent fiber (NDF), acid detergent fiber (FDA), neutral detergent insoluble nitrogen (NDIN), acid detergent insoluble nitrogen (NIDA), insoluble neutral detergent fiber corrected for ash and protein (NDFap), digestible nutrient intakes and performance variables. The variance and regression analysis showed no effect (p>0.05) different levels of monensin on digestibility and nitrogen balance. The reduction test Methylene blue showed a linear effect decreasing with the rise of monensin. The use of monensin in quantities of 30, 60 and 90 mg day-1 in sheep diet causes linear increase in serum urea and β-hydroxybutyrate. The monensin does not affect dietary intake and performance of sheep fed diets with high content of roughage. The monensin at levels 30, 60 and 90 mg / day, diets with high roughage content has no effect on digestibility of dry matter and nitrogen balance. The different levels of monensin in diet make the rumen more reducer to methylene blue, by favoring the gram-negative bacteria.