Efeitos da lisina livre e protegida em cera de carnaúba associada ao tanino da Mimosa tenuiflora na dieta de ovinos.

Abstract

The present work aimed to evaluate the effects of free and protected lysine in carnauba wax associated with tannin from Mimosa tenuiflora in the sheep diet on performance, nutrient digestibility, nitrogen balance, ingestive behavior, biochemical parameters and carcass quality. and Santa Inês sheep meat. Forty animals were used for the performance stage, with an average of 120 days of age and 23 ± 1.2 kg of live weight, distributed in four treatments (0.0% lysine; free lysine in the diet; lysine microencapsulated in wax carnauba; and microencapsulated lysine in carnauba wax associated with tannin extract from jurema preta, with ten repetitions. For the nutrient digestibility and nitrogen balance stage, 24 animals were used, divided into four treatments, with 6 replications. There was no influence (p > 0.05) of the treatments on the performance of the animals for GPT, GPMD, Ing. MS, CA and EA. In terms of consumption, there was the same behavior for both treatments, where only the free lysine treatment showed the lowest consumption of ether extract. For nutrient digestibility indices, there was no difference for DigMS, DigMM, DigMO, DigEE, DigFDN and DigCHT. For DigPB and DigCNF, the control treatments, wax+lysine and wax+lysine+tannin showed the best rates. In the nitrogen balance, the same behavior occurred between treatments, for Ning, Nfezes, Nurina, Nabs and Nretido. In terms of biochemical parameters, there was similar behavior in animals from both treatments, and the variables remained within reference limits. For the analysis of ingestive behavior, there was no difference (p > 0.05) between treatments, for number, time, chewing, ingestion, rumination and idleness per minute. There was no difference (p > 0.05) between treatments for carcass characteristics and physical-chemical parameters of the meat among the treatments tested. The inclusion of essential amino acids (lysine) in free or protected forms in carnauba wax, associated or not with tannin from Jurema Preta, did not promote changes in the performance characteristics and quality of the carcass and meat of crossbred sheep in confinement.