猪应激的原因、临床表现、及防治措施(国外英文资料).docVIP

猪应激的原因、临床表现、及防治措施(国外英文资料) First, the cause of heat stress 1, pig is a constant temperature animal, subcutaneous fat thick, juice gland is not developed, the body heat distribution is slow, not good at evaporation through the skin to regulate body temperature, so the pig is very resistant to heat. Pig farming practice proves, the optimum temperature increases with the increase of body weight and age, the suitable temperature of newborn piglets weaned piglets is 27--29 Deg. C, 21--24 DEG C, finishingpigs 15--25 C, farrowing and lactation sows 16--18 C. In the optimum range of environmental temperature, the heat and heat dissipation of pig keeps dynamic balance, so the pigs body temperature keeps constant, feed utilization rate is high, growth rate is fast, and disease resistance is strong. 2, the environmental temperature exceeds the optimum temperature range, the pigs heat is greater than the heat, the pig will by increasing the evaporation of breathing and radiation cooling, or by reducing feed intake, thereby reducing the body heat production regulation of body temperature balance. By increasing heat dissipation and reducing heat production, the bodys temperature balance can not be maintained, which raises the body temperature of pigs. According to reports, 18--28 kg piglets at 35 C, body temperature by normal body temperature rise 1..4 degrees centigrade. Long term exposure to high temperatures of the pig, if the heat produced from excessive accumulation in the body can not, it is easy to make the temperature high, resulting in changes in the neuroendocrine system of pigs, caused by heat stress and even heat stroke. Two, the clinical manifestations and hazards of heat stress Heat stress in pigs can lead to slow growth or stagnation, and heat stress in pigs can affect fertility. Pigs mainly for depression, loss of appetite, body temperature, heartbeat, shortness of breath or breathing. 1, boar - low libido, semen quality decreased, sperm count decreased, vitality