Parâmetros ruminais de bovinos Jersey alimentados com diferentes proporções de PDR e PNDR utilizando feno de tifton e feno de azevém

Abstract

The use of hay as bulky food, allowing the storage of material of nutritional quality for a long period of time. Evaluating this type of food, especially regarding the availability of rumen degradable protein (PDR) is of utmost importance for the production of microbial protein and non-rumen degradable protein (PNDR) for metabolizable protein requirements. The objective was to estimate the ruminal parameters (pH, ruminal ammonia concentration and sugars) of Jersey cattle, where four diets were formulated: Ryegrass hay with high ratio of PDR: PNDR (65:35) and low ratio (60: 40), the same ratios will be used for tifton hay. The experiment was carried out at the Federal Technological University of Paraná, Campus Dois Vizinhos, in the Animal Metabolism Unit, in a 4x4 Latin Square experimental design (4 diets and 4 periods), using 4 rumen fistulated Jersey steers weighing approximately 350 kg, which were fed ryegrass hay or tifton hay, and the treatments consisted of high ryegrass ryegrass hay: PNDR (65:35) and low ratio (60:40), and high concentration tifton hay PDR: PNDR (65:35) and low ratio (60:40). The experimental period was 20 days, 15 days for diet adaptation and five days for sample collection. To estimate ruminal parameters, ruminal fluid collections we reperformed during the 20th day of each collection period and later laboratory analyzes were performed to determine the concentration of ammonia and sugars. Data were subjected to analysis of variance using the mixed model procedure and means compared by Tukey test at a 5% significance level. The pH showed significant difference between treatments and hours after feeding, ammonia had no effect between treatments, only after feeding and soluble sugars showed no significant difference in any of the evaluated parameters.