光是對豬的生存、xingweiheshengchanjuyouzhijiezuoyongdezhongyaoyinsuzhiyi。hongwaixianhekejianguangjuyouguangrexiaoying
，qizhonghongwaixianhekejianguangdechangbobufen
，ketiaojiezhujitiderejineng。youyuhongwaixiankechuantoupifudajilimi
，shishenbuzuzhishengwen，cujinpifuxueyexunhuan，jiasuxinchendaixiehexibaozaishengguocheng

，yincijuyouzhentong
、消炎和促進傷口愈合的作用。適當接受太陽熱輻射
、陽yang光guang的de沐mu浴yu不bu僅jin讓rang豬zhu感gan覺jiao到dao舒shu爽shuang，同tong時shi又you有you一yi定ding殺sha菌jun和he促cu進jin細xi胞bao成cheng熟shu的de作zuo用yong，對dui某mou些xie喜xi陰yin性xing寄ji生sheng蟲chong也ye有you一yi定ding的de殺sha滅mie或huo抑yi製zhi作zuo用yong，減jian少shao皮pi膚fu病bing的de發fa生sheng率lv。但dan長chang時shi間jian的de陽yang光guang直zhi接jie照zhao射she，600納米～1000納米的紅光可穿透顱骨，使顱內溫度升高，導致腦部損傷的“日射病”
，豬表現焦躁不安、昏厥
、痙攣等中暑症狀
，嚴重時會因呼吸和循環障礙而死。眼睛接受過量的太陽輻射，可使水晶體及眼內液升溫引起視力障礙、白內障及視網膜脫離等症狀。由此可見，酷暑高溫時強烈的太陽輻射對豬的體熱調節、shengchanlihejiankangjunbuli。xiangfanzaihanlengjijiezeyingzhuyizhuchanghezhushedexiangyanghecaiguang，duiyujianhuanlengyingji
，cujinzhuzhijiankang，gaishanzhushexiaoqihoudouyouzhongyaoyiyi。

陽光中的紫外線具有較強的生物學效應。適當的紫外線照射，可使皮膚中7—脫氫膽固醇變成VD3
，從而促進腸道對鈣的吸收
，促進骨骼生長發育，預防佝僂病；紫外線還具有促進體內代謝作用，從而可以提高豬的生產力和飼料轉化率
；紫外線還具有殺死細菌、病毒真菌的作用，增強免疫力。但紫外線過量照射會造成豬的皮炎等。

增加夜間光照
，便於豬采食，增加營養，促進生長。較充足的光照可促進豬性成熟，有利於豬的發情、配種、妊娠和生長發育。陽光可促進種豬體內VE的吸收及性功能的正常發揮，較長的光照時間可促進性腺係統發育，性成熟較早；短duan光guang照zhao
，特te別bie是shi持chi續xu黑hei暗an，抑yi製zhi性xing係xi統tong發fa育yu，性xing成cheng熟shu延yan遲chi。在zai實shi際ji生sheng產chan中zhong，我wo們men都dou知zhi道dao對dui於yu個ge別bie長chang期qi乏fa情qing的de母mu豬zhu放fang到dao外wai邊bian曬shai一yi段duan時shi間jian太tai陽yang後hou就jiu能neng正zheng常chang發fa情qing。

qiangguangduizhutizhifangdechenjiyoujianmanzuoyong，anguangkeshizhutizhifangchenjijiakuai。guangzhaoqiangdudebianhuaduizhuxingchengshudeyingxiangyeshifenxianzhu，shijianzhengming，zaikaifangzhushesiyangdezhuxingchengshuxianzhuzaoyufengbisheneisiyangdezhu。guangzhaoxianzhuyingxiangzhu（特別是仔豬）demianyigongnenghejitiwuzhidaixie。shidangyanchangguangzhaoshijianhuotigaoguangzhaoqiangdu，kezengqiangshenshangxianpizhidegongneng

，tigaomianyili
，cujinshiyu，zengqiangzaizhuxiaohuajineng，tigaozengzhongsuduyuchenghuolv。danqiangguangyehuiyinqizhuxingfen
、fanzao，zengjiazhudehuodongshijian，jianshaoxiuxishuimianshijian，yingxiangzhudeshengchangfayu，shenzhichuxianchizaiheburubuliangdengxianxiang，youzaidesiwanglvhuizengjia。ruoguangshizhuzhenjing
，fanyingchihuan
，fanzhilvjiangdi，tizhixiajiang。