Effect of grain level and protein source on ruminal fermentation, degradability, and digestion in milking cows fed silage.

摘要: Abstract Five primiparous Holstein cows (483kg BW) of low productivity were used in a 4 × 5 incomplete Latin square design to study the effects feeding two levels grain containing soybean meal and one level fish on feed intake, milk production, digestibility, rumen fermentation. Animals all fed alfalfa silage for ad libitum intake. Collection data was between wk 11 24 lactation. The four treatments an diet (control), medium concentrate at 1.8% BW meal, 1.3% either or meal. Treatments other than control designed give similar CP intake from concentrate, which based high moisture corn cob Milk production composition among except fat percentage, significantly lower Intake DM higher compared with treatments. Average change (.11kg/d) not affected by Digestibility (68 73%) those (60%). Generally, 1.3 supplementing resulted pH concentrations NH 3 N VFA observed diet. Feeding supplying did utilization enough increase producing