Effects of substitution of processed soybean seed with soybean meal on performance، nutrient digestibility، and some blood and ruminal parameters in Holstein dairy cows
Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
Background And Objectives
Feed processing may increase feed consumption efficiency and consequently animal performance. The requirement for protein in high yielding dairy cows is often more than the capacity of ruminal microorganisms. So using bypass proteins is important. Soybean processing causes rumen undegradable protein content to be increased, that could increase protein absorption in the small intestine, with least changes, and improve nitrogen utilization efficiency.
Materials And Methods
Nine multiparous Holstein cows, 571.4 ± 58 kg body weight, 117 ± 9 d milk production and 29.4 ± 8 kg milk production, were assigned to a change over experimental design. Treatments comprised basal diet soybean meal, basal diet roasted soybean seed, and basal diet extruded soybean. Three cows in each period and group were considered as replicate. This experiment was carried out in three periods and each period last 21 days, 14 days of adaptation and seven days sampling and data collection. Milk production was recorded daily. On the nineteenth and twentieth day of each period, a sample of milk was collected in order to measure fat, protein, lactose, and milk total solids. Blood, milk and rumen nitrogen were measured in each sampling period. Rumen pH and blood parameters, glucose, urea nitrogen, total protein, triglyceride, and cholesterol, were assessed.
Results
Substitution of processed soybean with soybean meal had no effects on dry matter intake and body weight. Total milk production, milk production as 3.5 % fat corrected milk, total solids, fat percent, protein percent, lactose percent and milk urea nitrogen were not different among treatments. Rumen pH and rumen ammonia nitrogen were not affected by treatments. Apparent digestibility of nutrients was not affected by substituting soybean meal. Blood glucose, urea nitrogen, total protein, triglyceride, and cholesterol were same among experimental groups.
Conclusion
Results of present study showed that substitution of soybean meal with roasted or extruded soybean will not improve milk production of dairy cows in mid-lactation. So substitution of soybean meal with processed soybean is not reasonable unless soybean processing be less expensive than soybean seed oil extraction.
Language:
Persian
Published:
Journal of Ruminant Research, Volume:5 Issue: 4, 2018
Pages:
61 to 72
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