The Research Of Environmental Benefits Of Improvac Used In Pig Breeding

As a traditional technology of pig breeding industry, the boar castration has been being used for thousands of years at home and abroad. The technology can effectively avoid uncontrollable aggressive behavior and smell of boar during the breeding process, but it also has problems of influencing the growth efficiency, increasing mortality and damaging animal welfare issues. In order to solve these problems and keep the advantages of traditional castration, researchers have set up a scheme of immunology, namely injecting live pig with Improvac immune control vaccine in the breeding process by immunization instead of artificial emasculation. Comparing with the actual results of Improvac immune control vaccine used in the three different climatic provinces domestically, this research has studied the environmental and economic benefits of weight gain and feed conversion ratio, and the pollution reduction benefits of pollutant indexes such as CODcr, TN, TP, and NH3-N. The main results of experiments were as follows:(1) The T tests were done in Hainan, Hunan and Heilongjiang provinces. The difference of the analysis results were:The difference of the pollutant indexes including CODcr, TN, TP and NH3-N was very slight (P>0.05) according to the two comparative groups’data. But the difference was big (P<0.05) between the Improvac group and the artificial castration group. These indicated that the Improvac immune control vaccine was not only unrestricted by the breeding climate and breeding farm size, but also more effectively in reducing pollutant indexes compared with artificial castration.(2) By the analysis results of live pig weight gain and the feed conversion ratio in the experiments, it could conclude that the weight gain of Improvac group was higher than that of artificial castration group, but there was an opposite result about the feed conversion ratio during the feeding period in different experimental province. It was showed that the using of Improvac immune control vaccine could make a better profit in breeding live pigs.(3) According to the daily average pollutant yield of every group in the experimental period, and the difference between artifical castrastion and immue castration in the breeding way, it could conclude that the main pollutant indexes including CODcr, TN, TP, and NH3-N of Improvac group were lower than that of artificial castration group in the live pig breeding process. (4) The pollutant yield of weight gain was defined as the sum of all the daily pollutant data, divided by the weight gain from the feeding period to the marketing period. According to the average pollutant yield of weight gain by comprehensively analyzing the experimental results in the three provinces, it was illustrated that:the pollutant indexes including CODcr, TN, TP, and NH3-N of the Improvac group decreased by3.82%,7.76%,7.77%and8.47%respectively, compared with that of the artificial castration group.