An Investigation on Determining Protected (By-Pass) Protein Values of Dairy Compounds Exposed to Different Treatments


Abstract: This study was carried out to determine the degradation characteristics of dairy compound feeds (DCF) subjected to various treatments, (fat, F; tannic acid, TA; fat+tannic acid, (F+TA), as well as the combination of all levels of F and TA). In the in situ trial, ruminal dry matter (DM) degradabilities, organic matter (OM) degradabilities, crude protein (CP) degradabilities and degradation parameters belonging to degradability values (a, b, c, a+b) and pepsin soluble nitrogen contents of 25 DCF were subjected to F (1, 2, 3 and 4%) , TA (2.5, 5.0, 7.5 and 10%) and F+TA (a combination of all levels of F and TA). They were examined after 4, 8, 12 and 24 incubation in 3 ruminal cannulated Karayaka wethers. According to the in situ DM, OM and CP degradability values the most resistant feed to microbial degradation is 3F+2.5TA. The highest pepsin solubility was obtained from 1F+2.5TA and 2F+2.5TA. Of feed exposed to TA treatment, the most resistant to microbial degradation was 10TA. In terms of pepsin solubility, the highest value was found for 7.5TA, while no difference could be determined between 2.5TA, 5.0TA and 7.5TA (P>0.05). When the feeds exposed to F treatment were evaluated in terms of degradation characteristics it was seen that 2F gave better results when compared to the other feeds.

Keywords: Dairy compound feed, protected protein, fat, tannic acid, treatment

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