bachelorThesis
Consumo e digestibilidade in vivo de nutrientes e cinética ruminal in vitro de diferentes proporções de PDR e PNDR em dietas contendo feno de gramíneas temperadas e tropicais
Fecha
2019-11-06Registro en:
RAFAIN, Eduarda de Souza. Consumo e digestibilidade in vivo de nutrientes e cinética ruminal in vitro de diferentes proporções de PDR e PNDR em dietas contendo feno de gramíneas temperadas e tropicais. 2019. Trabalho de Conclusão de Curso (Bacharelado em Zootecnia) - Universidade Tecnológica Federal do Paraná, Dois Vizinhos, 2019.
Autor
Rafain, Eduarda de Souza
Resumen
Crude protein (CP) can be classified as rumen degradable protein (RDP) and rumen non-degradable protein (RNDP). He RDP fraction provides amino acids and ammonia for the ruminal microbial synthesis, stimulating the intake and digestibility of the diet fibrous fractions. However, the ideal level of RDP may be different according to the morphological structure of bulkused onthe diet. The aim wastoestimate the in vivointake and digestibility of dry matter, neutral detergent fiber and crude protein, of fistulated Jersey steers fed with ryegrass hay and Tifton hay in different proportions of RDP and RNDP, as like the in vitroruminal kinetic parameters of bulk na diets with different content of RDP na RNDP. The in vivo assaywas carried outat the Universidade Tecnologica Federal do Paraná (UTFPR), Campus Dois Vizinhos, in the Animal Metabolism unit. The in vitro assay was conducted at Laboratório de Análise de Alimentos. For in vivo assay, the experimental design wasa 4 x 4 Latin Square (4 diets x 4 periods), using four castrated, rumen fistulated male steers with a 350 kg live weight, which will be fed with hay temperate or tropical grass. The animals werefed with 3% of their body weight, in a diet composed of 50% bulky and 50% concentrate meal, in which four diets will be formulated: Ryegrass hay with high RDP ratio: RNDP (65:35) and low ratio (60:40), the same relation ships were used for tifton hay. In order to predict ruminal kinetics in vitro, a bicompartmental mathematical model were applied, evaluating the volume of gas produced, degradation rate and latency time, through the procedure of nonlinear models. The invivonutrient intake and digestibility data wereevaluate by the mixed model analysis. It is expected that treatment with temperate grasses at low RDP: RNDP ratios will promote higher intake and better digestibility, whereas in the tropical grass diet this condition isexpectedwhen it has the high ratio RDP:RNDP. In vitro ruminal kinetics, there was no difference in the degradation curve of the different levels of PDR: PNDR, only with difference in the type of grass used, and when observed the parameters of diets and hay, it can be concluded that neither There was adifference in the ratio of RDP: RNDP, which influenced only the type of forage, where the only significant difference was in latency (L) which was smaller for the tifton hay in the ratio 60:40.