| Autor: |
Molosse VL; Department of Animal Science, Universidade do Estado de Santa Catarina, Chapecó 89815-630, SC, Brazil., Pereira DAB; Instituto de Zootecnia, Centro APTA Bovinos de Corte, Sertãozinho 14160-970, SP, Brazil., Rigon F; Department of Animal Science, Universidade do Estado de Santa Catarina, Chapecó 89815-630, SC, Brazil.; Instituto de Zootecnia, Centro APTA Bovinos de Corte, Sertãozinho 14160-970, SP, Brazil., Loregian KE; Department of Animal Science, Universidade do Estado de Santa Catarina, Chapecó 89815-630, SC, Brazil.; Instituto de Zootecnia, Centro APTA Bovinos de Corte, Sertãozinho 14160-970, SP, Brazil., Magnani E; Instituto de Zootecnia, Centro APTA Bovinos de Corte, Sertãozinho 14160-970, SP, Brazil., Marcondes MI; Department of Animal Sciences, Washington State University, Pullman, WA 99164, USA., Branco RH; Instituto de Zootecnia, Centro APTA Bovinos de Corte, Sertãozinho 14160-970, SP, Brazil., Benedeti PDB; Department of Animal Science, Universidade do Estado de Santa Catarina, Chapecó 89815-630, SC, Brazil., Paula EM; Instituto de Zootecnia, Centro APTA Bovinos de Corte, Sertãozinho 14160-970, SP, Brazil. |
| Abstrakt: |
The ruminal kinetics of protein sources may be changed by heat and sugar treatments. Thus, these processing methods may be used as alternatives to increase beef-cattle diets’ rumen undegradable protein (RUP). We aimed to evaluate the effects of processing cottonseed meals with autoclave, conventional, and microwave ovens, with and without using xylose, on the ruminal kinetics degradation parameters and intestinal digestibility (ID). In situ studies were conducted, and each sample was incubated in the rumen to determine dry matter (DM) and crude protein (CP) rumen degradation kinetics. In vitro studies were also conducted to evaluate ID. The control treatment had a greater soluble fraction for DM and CP than processed cottonseed meals (p < 0.05). The addition of xylose decreased both DM and CP water-soluble fractions (fraction A) of cottonseed meal heated in a conventional oven (p < 0.05). Compared to the control, we observed a decrease in effective degradability and increased RUP for all processed methods (p < 0.05). Furthermore, conventional and microwave ovens showed greater ID than the control. Moreover, xylose-treated groups heated in the autoclave and conventional ovens had greater ID than xylose-untreated cottonseed meal. Under these experimental conditions, cottonseed RUP was increased by the evaluated processing methods. |
