Effect of Different Salinity Levels of Drinking Water on Rumen Degradation Kinetics of Barley Grain in Iranian Native Sheep
Subject Areas : Journal of Animal Biology
Mir ali Pishdadi motlagh
1
(Department of Animal Science, Shabestar Branch, Islamic Azad University, Shabestar, Iran)
Ramin SalamatDoust-Nobar
2
(Department of Animal Science, Shabestar Branch, Islamic Azad University, Shabestar, Iran)
Naser Maheri-Sis
3
(Department of Animal Science, Shabestar Branch, Islamic Azad University, Shabestar, Iran)
Amir-Reza Safaei
4
(Animal Science Research Institute, Agricultural Education and Extension Research Organization, Karaj, Iran)
Abolfazl Aghajanzadeh-Golshani
5
(Department of Animal Science, Shabestar Branch, Islamic Azad University, Shabestar, Iran)
Keywords: barley grain, rumen degradability, metabolizable protein, water salinity, Nylon bags,
Abstract :
This study was conducted to investigate the effect of different salinity levels of drinking water on the ruminal degradability of barley grain using the nylon bags technique in Iranian Shal sheep. Ruminal degradability of dry matter (DM) and crude protein (CP) of barley grain were determined by nylon bags method using eight rumen cannulated rams that received different levels of saline water including control group (480), 4000, 8000, and 12000 mg/l total dissolved solids (TDS). There was a significant difference between experimental treatments in terms of the degradability of DM and CP in all incubation times except the initial time. In the final incubation time, the ruminal degradability of the DM and CP of barley grain were higher in saline water received treatments than the control group. There was a significant difference between the effective degradability (ED) of DM and CP in the experimental treatments. So, the effective degradability of DM and CP of barley grain often increased with increasing salinity. The quickly degradable protein (QDP) fraction was not affected by experimental treatments but the slowly degradable (SDP) protein fraction increased significantly at the maintenance level of nutrition (2%/h); the highest level of SDP was obtained in treatment containing 8000 mg/l TDS. From the viewpoint of metabolizable protein (MP), there was a significant difference between experimental treatments at the maintenance level of nutrition. The lowest MP was observed in treatment containing 8000 mg/l TDS. In overall conclusion, saline water consumption in the experimental animals seems to affect the ruminal degradability of barley grain and leads to an increase in the effective degradability of DM and CP and a decrease in the amount of MP at the maintenance level..
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