Study On The Relationship Between The Humid And Hot Pig Housing Environment And The Thermoregulatory Behavior Of Growing Swine And Sows In Southeast China

The restrain effect of environment conditions on the level of pig production has been prominence increasingly in intensive systems of animal production and people have been paying attention to it increasingly, so the level of environmental control!, has been an important symbol of modern pig production. High relative humidity and hot environment in pig housing can cause serious heat stress for the pig, heat stress influences productivity of swine by altering their exchange with the environment, feed intake rate, average daily gain, oestrus and litter rate of sows, survive rate of piglets and behavior of swine. At the same time, there are little report about the research on the relationship between high humid and hot pig housing environment in southeast China and the thermoregulatory behavior of sows and growing pigs at the present, especially, much less research using modern technology and equipments in the field of animal research. Additionally, there aren?t applicable cooing systems for pig housing in southeast China at the present, pig farms usually design cooling systems and schemes for pig housing according to experiences. In order to improve the pig production in these areas, it is necessary to develop an economical and efficient cooling system for pig housing on the basis of research on pig?s thermoregulatory behavior in relation to the hot environmental conditions. Oestrus detection and the optimal time of insemination of sows is an important activity within sow husbandry, it directly influences the litter rate of sows. Some methods that farms are used to detect sow s oestrus inside and outside China would take a great deal of labour input, for instance, it takes about 30% of the overall labour input in Europe. It is necessary for improving sows reproduction to seek convenience method of oestrus detection. iv With the view of the above eondition, this paper was expected to engaging in pig?s thermoregulatory responses to high humid and hot pig housing in southeast China using an animal physiological parameters on條ine telemetry system (DSI) and animal environment and infrared behavior detecting system, discussing the effects of humid and hot environment on the performance, body temperature, heart rate and activity of growing pigs, and discussing the environmental need of pig production, providing theory gist for environmental control and cooling systems of pig production in summer. At the same time, this paper was expected to study sows oestrus detection, the optimal time of insemination and the relationship between oestrus of sows and environment using an animal environment and infrared behavior detecting system. The following are some in detail: In the aspect of environment analysis of pig housing in summer, this research was measured in real time the temperature and relative humidity of experimental close pig housing with negative pressure ventilation in July, August and September by using animal environment and infrared behavior detecting system. It was round that the environment of pig housing in summer in southeast China wasn?t beneficial to pig production through measuring data analysis: the highest temperature, average daily temperature and average daily relative humidity of pig housing were 35 0C, 290C and 60% respectively in the end of July; the highest temperature, a...