كليدواژه :
Clinoptilolite , Sodium bicarbonate , Blood metabolite , Milk composition , milk , كلينوپتيلوليت , بي كربنات سديم , شير(لبنيات ) , متابوليت خون , گاوها
چكيده لاتين :
An experiment was conducted to evaluate the effects of different levels of clinopetilolite - rich tuff (CP) and sodium- bicarbonate (SB) on blood metabolites, milk yield and its composition in Holstein cows. A balanced change - over design with 4 rations, 4 periods (21 days) and 4 cows per ration were employed. The ingredients of control ration (l)were alfalfa hay (17.1%), corn silage (16.2%) and concentrate (66.7%) on dry matter basis. Experimental rations contained, 1% SB (2)., 0.5% SB + CP (3) and 6%CP (4), respectively. The means of plasma cholestrol were 208.5, 197.0, 251 and 214.5 mg/dl for cows received ration 1,2,3 and 4, respectively. The use of either sodium bicarbonate or clinoptilolite did not significantly affect the plasma Ca, P, Mg, CI, Na and K. pH of the rumen and urine were higher fou ration 2, 3, and 4 than ration 1 (p< 0.05). The actual means of daily milk yield of the cows that received rations 1,2, 3 and 4 were 23.53, 24.2, 25.24, 25.45 kg/d and milk fat% 3.18, 3.39, 3.3 and 3.44, proteten, respectively. The average dry matter intake per kg fat corrected milk for rations 1-4 were, 0.82, 0.87, 0.90 and 0.88, respectively. The pH of rumen liquore of the cows receiving ration 2, 3, 4 was significantly higher than ration 1 (p < 0.05) .The pH of urine of the cows receiving ration 2 was higher than others (p< 0.05 ). Also, concentration of glucose, calcium, phosphorus, magnesium, chlorine, sodium, pottasium, cholesterol, triglycerides, total protein and urea in plasma of cows receiving different rations were slightly in general, the results of this experiment indicated that the use of clinoptilolite and sodiom bicarbonate in ration of dairy cows is recommondale.
