Comparison of diagnostic methods in herds with cow subclinical ruminal acidosis | Diagnostisko metožu salīdzinājums govju subklīniskās acidozes skartā ganāmpulkā
2012
Viduza, M., Latvian Association of Veterinarians, Riga (Latvia) | Liepa, L., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Veterinary Medicine
Cows Subclinical Ruminal Acidosis is a herd‘s affection which usually goes without clinical signs. The aim of our investigation is to establish the most exact and practically useful method for diagnostics of subclinical ruminal acidosis of cows. Research is done in herd with 210 milking cows with average milk yield 7500 kg of milk from a cow per year. In the experiment have been used 13 cows till 21 - 32nd day of lactation. All these cows are analysed blood pH, CK, Na, K, Cl, TCO2 and calculated is anion gap, with rumenocentesis method is fixed rumen pH. 53.8% of cows from experimental group have rumen liquid pH is less than 5.5, it approved the presence of subclinical ruminal acidosis presence in this herd. The coefficient of milk fat:protein for experimental cows is 1.29 ± 0.06, which is lower than listed in academic literature 1.4 (Dirksen, 1995). There has no founded a linear correlation (r=0.064) between relation of milk fats-proteins and values of pH of rumen‘s content. Between difference‘s values of cow‘s blood pH and serum anion is recognized a medium tight negative linear correlation (r= -0.75). There is no definable disparity (p is greater than 0.05) between parameters of serum‘s biochemical indices for cow‘s group with rumen liquid pH is less than 5.5 and for group with rumen liquid pH is greater than 5.5. In our experiment, the most effective method of subclinical ruminal acidosis diagnostic is a rumenocentesis and determination of rumen liquid pH.
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