不同光照周期对蛋鸡高峰期血液激素水平的影响

Effect of Different Photoperiods on Blood Hormone of Laying Hens

将320只10周龄海兰褐商品蛋鸡,随机分为8组,每组4个重复,每个重复10只鸡。采用渐增和骤增两种增光方式,光照周期设11L∶13D、13L∶11D、15L∶9D、17L∶7D 4个水平。29周龄末,每个重复随机抽取2只鸡单笼饲养,每隔2 h采1次血,测定FSH、LH、P4和E2水平。结果表明:FSH和LH协同能促进卵泡成熟,促进卵巢分泌E2和P4,并引起排卵。以缓增,光照周期为11L∶13D(处理组Ⅱ)组的FSH、LH峰值含量最高;

At the age of 20 week, 320 Hyline （Brown） commercial hens were randomly assigned into 8 groups, with 4 replications per group, 10 hens in each replication. According to abruptly and slowly increscent methods, the experiment was designed to 11L： 13D, 13L ：11D, 15L ： 9D, 17L ： 7D four photoperiods. At the end of 29 week, 2 hens were randomly selected from each replication, in order to detect the level of FSH, LH, P4 and E2. The results showed that FSH cooperate with LH, which could accelerate ovum to maturate and arose ovary secreting E2 and P4, then ovulating, 11L： 13D photoperiod group by slowly increscent method（Group Ⅱ ） had the highest surge level of FSH and LH. The higher hormone secretion was not related to the longer photoperiod.