Effects of roasting and electron beam irradiating on protein characteristics, ruminal degradability and intestinal digestibility of soybean and the performance of dairy cows

• Published in: Livestock science 2014-10, Vol.168, p.45-52
• Main Authors: Akbarian, Amin, Khorvash, Mohammad, Ghorbani, Gholam Reza, Ghasemi, Ebrahim, Dehghan-Banadaky, Mehdi, Shawrang, Parvin, Hosseini Ghaffari, Morteza
• Format: Article
• Language: English
• Subjects: Dairy cows; Electron beam irradiation; Roasting; Rumen; Soybean
• ISSN: 1871-1413; 1878-0490
• DOI: 10.1016/j.livsci.2014.07.019

Various methods of processing soybeans (SB) may help to decrease its extent of ruminal degradation, thereby providing more nutrients needed for high producing dairy cows. Two experiments (in situ and in vivo) were conducted to examine the effect of roasting and electron beam irradiating on ruminal degradability and intestinal digestibility of SB and performance of dairy cows. In the in situ trial, nylon bags of untreated (USB), roasted (RSB), and irradiated (ESB) soybean were incubated in the rumen of three non-lactating cows for up to 48h. Additional samples of each SB product were also incubated for 12h in the rumen; the residues from these bags were transferred to mobile bags, soaked in pepsin HCl, and then used for determination of intestinal digestibility. The results showed that the roasting processing was an effective method of changing the site of digestion from the rumen to the small intestine and therefore the amount of digestible crude protein (CP) in the small intestine can be increased. However, total tract disappearance of CP was not significantly different between USM and RSB. Irradiation of SB increased (P