母兔妊娠期饲粮蛋氨酸水平对仔兔毛囊发育的影响

Methionine Level in the Diet for Pregnant Female Rabbits Affects Hair Follicle Development of Baby Rabbits

本文旨在研究母兔妊娠期饲粮蛋氨酸水平对仔兔毛囊发育的影响。选择体重、胎次和历史产毛量相近的健康长毛兔母兔54只,随机分为3组,每组18个重复,每个重复1只。妊娠期各组分别饲喂蛋氨酸水平为0.51%、0.71%和0.91%的饲粮。测定18胎龄、26胎龄、初生和2月龄时仔兔背部皮肤毛囊密度、直径以及2月龄时毛纤维直径。结果表明:1)仔兔的毛囊密度和直径以及2月龄粗毛纤维直径均随着蛋氨酸水平的升高呈增加趋势(P>0.05),0.91%组的2月龄细毛纤维直径显著大于0.51%组(P<0.05)。2)随着仔兔的发育,次级毛囊/初级毛囊逐渐增加,初生时0.51%组、0.71%组和0.91%组分别为5.84、5.56和5.81,至2月龄时分别为7.97、8.47和8.03。3)26胎龄至初生,0.51%组、0.71%组和0.91%组仔兔初级毛囊直径增加速度分别为0.58、0.57和0.61μm/d,初生至2月龄分别为0.11、0.11和0.12μm/d;初生至2月龄,0.51%组、0.71%组和0.91%组仔兔次级毛囊直径增加速度分别为0.00、0.01和0.01μm/d。结果提示,增加妊娠期母兔饲粮中蛋氨酸水平,有利于仔兔毛囊发育,能够提高细毛纤维直径。

This experiment was conducted to study the effects of methionine level in diet for pregnant female rabbits on the development of hair follicle of baby rabbits.Fifty-four healthy female long-haired Angora rabbits with similar body weight,parities and historical hair yield were randomly assigned into three groups with eighteen replicates in each group and one rabbit per replicate.Rabbits during pregnancy were fed diets with 0.51%,0.71% and 0.91% methionine,respectively.Hair follicle density and diameter in the back skin were determined at 18-day fetus,26-day fetus,newborn and 2-month-old,and hair fiber diameter at 2-month-old was also determined.The results showed as follows: 1) hair follicle density and diameter at each stage,coarse hair fiber diameter at 2-month-old showed a tendency of increasing with dietary methionine level(P>0.05),fine hair diameter in 0.91% group was significantly larger than that in 0.51% group at 2-month-old(P<0.05).2) With the development of baby rabbit,the ratio of secondary follicle and primary follicle increased gradually,at newborn of rabbits in group 0.51%,0.71% and 0.91% were 5.84,5.56 and 5.81,respectively,and at 2-month-old were 8.47,7.97 and 8.03,respectively.3) Baby rabbits in group 0.51%,0.71% and 0.91% gained increases of primary follicle diameter by 0.58,0.57 and 0.61 μm/d from 26-day fetus to birth,and 0.11,0.11 and 0.12 μm/d from birth to 2-month-old,respectively;they also gained increases on secondary follicle diameter by 0.00,0.01 and 0.01 μm/d from birth to 2-months-old,respectively.These results indicate that increase of methionine level in diet for female rabbits during pregnancy is a stimulation factor for the development of hair follicle of baby rabbits,and can improve their hair fiber diameter.