| Behavioral Stereotypies have been described as abnormal behaviors that are relatively invariant, regularly repeated, and without an obvious function. There has been public concern about the Stereotypies of livestock, along with the development of applied animal behavior science and animal welfare science. Many scientist consider Stereotypies an indicator of poor welfare and a measurement of good or poor welfare. A lot of work is performing to study the behavioral Stereotypies in the academia..In this thesis, some experiments were conducted to investigate the effects of different production environments on sows' behavioral Stereotypies, by observing the performance of Stereotypies of the different breeds of gilts or multiparous sows' in different production systems. And, a study was carried out firstly to investigate Halothane Gene on the performance of sows' Stereotypies.l)The Study on the Stereotypies in Sows That Were in Individual Farrowing PenSow was kept in individual farrowing pen(3 mx3.1m) with the provision of straw .Food was dispensed into the concrete two times every day. All sows defecated 4 times every day out of door. Two experiments were conducted in this study.In Experiment one, 48 gilts or multiparous sows of Yorkshire , Landrace, and Chinese Min were used, the Experiment began 2 weeks before parturition. Sows were observed between 8:00-10:00 A.M and 2:00-4:00 P.M for 2 days every week. During observation scan sampling was adopted and the time duration for each observation is one minute.In Experiment two, 32 gilts or multiparous sows of Yorkshire and Landrace were used. Every sow was observed on three occasions(approximately 4 or 5, 7 or 8, 11 or 12 weeks after pregnancy) . Observations started at feeding and continued for 150 mintues. During observation scan sampling was adopted and the time duration for each observation is one minute.The results showed there were not vacuum chewing behavior in all groups. Many sows rooted or chewed Straw and bit bar. Oral behavioral Stereotypies of sows were often expressed after feeding, the difference of behaviors between breeds with same parity is little. Multiparous sows expressed more oral behavioral Stereotypies than gilts sows.2)The Study on the Stereotypies in Sows That Were Housed in Group PenIn Experiment, 48 gilts or multiparous sows of Yorkshire and Landrace whose Feed intake were restricted were used. Sows were kept in group of 4 in pregnancy pen(3 .55m><4m). All animal were divided into 12 groups according parity, breeds and pregnancy stage. Everysow was observed for 3 days. Observations started at 30 minutes before feeding and continued for 150 minutes. During observation scan sampling was adopted and the time duration for each observation is one minute.The results showed that every group expressed many vacuum chewing, bar-biting or manipulating trough behavior. Behavioral stereotypies were often expressed before sand after feeding. Different breeds and parity had significant impact on performance of behavioral stereotypies3)The Study on the Stereotypies in Sows That Were in Individual Farrowing crateTwo experiments were conducted in this study.In Experiment one, 76 gilts or multiparous sows of Yorkshire , Landrace, Yorkshirex Landrace and Duroc were used. Sows whose Feed intake were restricted were kept in Individual Farrowing crate(0.6m><2.1m). 2 weeks before parturition. Sows were observed between 8:00-10:00 A.M and 1:30-3:30 P.M for 2 days every week. During observation scan sampling was adopted and the time duration for each observation is one minute.In Experiment two, 12 multiparous sows of Yorkshire, Duroc and Landrace were used. All animal were divided into 3 groups according breeds. Every sow was observed for 7weeks in Individual Farrowing crate and for 2 weeks in dry sow pen(2.5m><3m). Sows were observed between 8:00-10:00 A.M and 1:30-3:30 P.M for 2 days every week.During observation scan sampling was adopted and the time duration for each observation is one minute.The results showed that every...
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