Live stock is a vital industry economically and with the increase of population its demand is becoming high. Therefore; scientists are focusing to find alternate ways to reduce the cost of ruminant feeding. Olive by-products (olive leaves, olive cake) are considered as significant feed source for ruminants. After the extraction of oil; by pressure or centrifuging from olives, olive cake is produced as a by product. This Olive cake (preserved by ensiling or drying) includes remains of pulp, stones, skins of olive and water1. But, it is badly affected by Tannins. Tannins (phenolic compounds); are the main anti-nutritional factor in olive by-products. Researchers suggested to use polyethylene glycol (PEG) in animal rations; because it absorbs condensed tannins2 and neutralizes the negative impacts of tannins on feed intake in live stock3,4.
Mohamed Sayed Farghaly and co members conducted a research to evaluate the impacts of replacing clover hay in diet by 33 and 67% treated olive cake with or without polyethylene glycol on digestibility, rumen parameters and growth performance of Barki lambs. For this purpose, thirty five Barki lambs averaged 34 kg body weight and 5 months old were divided into 5 groups (7 animals of each) according to live weight for 90 days feeding trial. Olive cake was treated mechanically by hummer mill, for the manufacturing of screening olive cake (treated olive cake, TOC).
Scientists observed that digestibility of dry matter and organic matter was reduced with ration containing 20% TOC from ration or 67% from clover hay as compared to others. They noted zero significant differences among groups in crude protein digestibility. Total digestible nutrients (TDN) as an energy measurement for the experimental rations cleared that replacing process of clover hay by TOC up to 20% of DM intake or 67% of clover hay, given lower values (65.32 and 66.80%). The rumen pH values were not affected by the different experimental rations including control. The maximum rumen NH3 was noted with lambs fed ration containing 33% TOC without PEG instead of clover hay, while the minimun values was recorded with that group fed ration containing 33% TOC with PEG. No significant differences were observed in total gain, ADG as well as feed efficiency among the experimental rations. Dry matter intake slightly amplified with feeding growing lambs on TOC containing rations except R5 compared to the control group.
It was concluded that partially de-stoned olive cake by screening could be utilized in replacement of clover hay for raising lamb rations, at inclusion levels up to 33 and 67% with or without poly ethylene glycol (PEG), having zero unfavorable impacts on performance of growing lambs.
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17 November, 2019