How to prevent and treat bovine respiratory distress syndrome in calves? Causes such as premature birth and hypoxia are complex

    Respiratory distress syndrome in newborn calves is clinically characterized by progressive difficulty breathing, bluish discoloration of the mouth and nose, and respiratory failure appearing shortly after birth (within 6 hours). It is seen mostly in premature calves born before full term and in calves delivered by cesarean section, and newborn calves from cows with pregnancy toxemia are even more prone to it. It is mainly related to premature birth, cesarean section, hypoxia, and acidosis, and both the incidence rate and mortality rate are high. Because the causes are complex, comprehensive measures should be taken for rescue to reduce losses to a minimum.

Calves

    Keep warm and provide oxygen promptly:After a calf is born, it transitions from a warm, nutritionally supported life inside the womb to an independent life outside it. Not only is its own development incomplete, but it is also unaccustomed to the outside world and has low resistance; combined with illness, hypoxia, or acidosis, its vitality is even poorer, so it needs a good environment and a suitable temperature (18°C to 21°C). As quickly as possible, use clean hands to remove the mucus blocking the calf's mouth and nose, keep the airway open, and give steam inhalation to reduce the viscosity of respiratory secretions.

    Correct acidosis:Correcting acidosis is an effective means of relieving acidosis in cattle; it addresses the harm acidosis causes to cattle and also dilates pulmonary blood vessels, improves pulmonary perfusion, and increases the oxygen-carrying capacity of hemoglobin. Method: each time use 5% sodium bicarbonate 10 milliliters per kilogram, add 10% glucose 250 milliliters, and administer by intravenous drip, which can raise the carbon dioxide combining power. If necessary, half can first be injected slowly intravenously, and then the remaining solution can be given by intravenous drip.

    Control heart failure:Strophanthin can be used; it strongly stimulates the myocardium and has low toxicity and accumulation, making it suitable for emergency treatment of acute cardiac weakness, collapse, and similar conditions. The dosage of strophanthin injection is 5 milliliters per time, once daily; intravenous injection should be slow, and it is best used together with glucose solution, but it should not be used long term. After the condition improves, switch to digitalis injection.

    Prevent cerebral edema:To control heart failure in calves, each time use 20% mannitol 5 to 10 milliliters per kilogram, 1 to 2 times daily. Sorbitol 8 to 10 milliliters per kilogram can also be used by rapid intravenous drip, generally finishing the drip within 15 to 30 minutes. If necessary, it can be repeated once after 3 to 6 hours. At the same time, use it alternately with diuretic solutions. If the head temperature is high and cooling is needed, a towel soaked in ice water can be wrapped around the calf's head and kept there until the temperature drops.

    Control hyperkalemia:An elevated blood potassium concentration is hyperkalemia, which can easily cause sudden cardiac arrest, so the blood potassium concentration must be lowered promptly. 15% glucose solution plus insulin can be used; generally, one unit of regular insulin is used for every 3 to 4 grams of glucose, given by intravenous drip.

    Improve cellular respiration:A deficiency of pulmonary surfactant causes difficulty breathing and reduced gas exchange; blood that has not been saturated with oxygen flows back to the heart, causing cyanosis and quickly leading to hypoxia and acidosis in the calf. Clinical signs: flaring of the nostrils, and in severe cases, breath-holding and apnea. Therefore, intracellular respiration must be improved promptly; cytochrome C 45 milligrams, adenosine triphosphate 50 milligrams, coenzyme A 150 units, and vitamin B6 200 milligrams can be given by intravenous drip.

    Prevent premature birth in cows:If a pregnant cow has pregnancy toxemia, it should be cured early to prevent respiratory distress syndrome in the calf. Also, regularly check the blood glucose of pregnant cows; when blood glucose is high, adjust promptly and give medication to keep blood glucose relatively stable. If a cow shows signs of premature birth, birthing assistance preparations should be made and drugs for stress rescue should be ready, adopting comprehensive therapy to reduce losses to a minimum.