Effect of using different levels of nano-zinc oxide with date by products on in vitro digestibility, fermentation characteristics and gas production
The experiment was conducted to study the effect of adding different levels of nano zinc oxide (0, 15 and 30 mg) / kg DM to mixture ration consisting of nano-zinc oxide with date by products either 30% date kernel or date peels or mixture (15 date kernel + 15 date peels) to 70% concentrate ration on digestibility, rumen characteristics, total gas and methane gas production. the results showed significant decrease as a result of adding nano-zinc oxide N zno in methane gas production for the treatment 15 and 30 mg/kg, and it reached (16.88 and 15.55 ml/200 mg), and (Date kernel produced significantly more total gas and methane, metabolizable energy (ME), in vitro organic matter digestibility (IVOMD%), and fatty acid short-chain SCFA (45.55, 23.77, 64.14, 11.25, and 1.02), respectively)..( Date kernel produced significantly more total gas and methane, metabolizable energy (ME), in vitro organic matter digestibility (IVOMD%), and fatty acid short-chain SCFA (45.55, 23.77, 64.14, 11.25, and 1.02), respectively. Also, the treatment of adding nano-zinc oxide at the level of 15 mg/kg dry matter significantly was superior to the digestibility factor of dry matter and organic, and it reached 62.29 and 63.96%, respectively, compared to the levels of 0 and 30 mg/kg dry matter and a significant decrease at levels of 0 and 15 mg/kg dry matter, which was 5.31 and 5.15 for pH 26.44 and 30.95 (mg/100ml) for ammonia nitrogen, respectively. whereas significantly increased for the level of 15 mg/kg dry matter, in the total volatile fatty acids and it reached 3.23 (mmol/100ml) after a 24-hour incubation period for the rumen fluid in vitro.
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