Food-habits Of Grazing Shanhei Pig

As China's accession to the WTO and the realization of global economic integration,Chinese animal husbandry to the world of animal husbandry and convergence,we must break the traditional mode of development and take the organic development.Northeast of China has a good ecological environment and resource advantages in organic livestock.Shanhei pig is lean pig in north China,is the fine variety trained by modern genetic breeding technology.In accordance with the requirements of organic pig production,in its growth cycle,a certain period of time must be kept grazing after three months feeding.It is great significance for production of Shanhei pig that Shaihei pig intake condition in the habits of forage.Plant species and number,grazed by 47 ShanHei pigs,were studied by combining direct observation and microhistological analysis in Xiyang Town,Yongji County,Jilin Province in May,July and October.The results showed that 48 plant species were grazed by ShanHei pig,including 20 families(40 species) seed plants,6 ferns,1 moss and 1 lichen.A wide variety of forage grass was grazed,herbages constitute 59%, wood plant constitute 29%,fern constitute 8%.Lichen and moss occasionally were grazed.Aboveground plant is the main intake,in particular,more stems and young leaves,less fruit category.Intake of shrubs and arbors were mainly Ulmus propinqua,followed by young shoots of the Quercus mongolica,Acer ginnala, Juglans mandshurica,bark of Larix,and so on.Intake of herbages mainly concentrated in Carex callitrichos. Lathyrus humilis and Trifolium repens were higher degree of preference.From the classification of plants,the Shanhei pig higher intake of plants concentrated in the Cyperaceae,Legnminosae and Aceraceae.Intake was changed with the seasons.Compared to the autumn,herbages intake are more in summer. Ulmus propinqua,Acer ginnala and Carex callitrichos are more eaten,moss and lichen are less eaten in summer and autumn.The plant skin and Shanhei pig dejecta were observed by the microhistological analysis.The plant species Shanhei pig grazed was identified in accordance with the horny cell structure in indigested dejecta. Those results were similar to the results that were based on the direct observation.So the microhistological analysis cart be used as reference in surveying plant species intake of grazing animals.