称量45日龄的小兔，体重应在0.75公斤以上，不能购买低于此标准的小兔。

A 45 day old rabbit should weigh at least 0.75 kilograms and should not be purchased below this standard.

看起来个头大，四肢强壮，体形匀称，眼睛清亮，动作敏捷，是好兔，切忌买有疥螨病或生理缺陷的长毛兔。

It looks big, with strong limbs, a symmetrical body shape, clear eyes, and agile movements. It is a good rabbit, and it is important not to buy a long haired rabbit with scabies or physiological defects.

看兔毛。长毛兔的毛以纯白色，浓密，细长为佳。判别法：用手指在长毛兔背上拔除少量兔毛，观察兔毛的颜色、粗、长等情况。

Look at rabbit fur. The fur of a long haired rabbit should be pure white, dense, and slender. Discriminant method: Use your fingers to remove a small amount of rabbit hair from the back of a long haired rabbit, and observe the color, thickness, and length of the rabbit hair.

辨公母鉴别幼兔的公母应查看其生殖孔。具体地说：用右手抓取兔颈皮肤，左手托住兔臀，用手指按压兔阴部。若紧贴肛门下方有与肛门大小相似的扁形孔穴，说明是一只母兔;若孔穴较圆，距离肛门稍远，说明是一只公兔;

To distinguish between male and female rabbits, one should examine their reproductive pores. Specifically, grab the skin of the rabbit's neck with your right hand, hold the rabbit's buttocks with your left hand, and press the rabbit's genitals with your fingers. If there is a flat hole closely below the anus that is similar in size to the anus, it indicates that it is a female rabbit; If the hole is relatively round and slightly far from the anus, it indicates that it is a male rabbit;

分龄法是根据长毛兔趾甲的颜色和形态来判断其年龄。指甲的基部呈粉红色，尖部呈白色，1岁兔趾甲上的红色与趾甲上的白色基本相等，1岁以上的兔趾甲上的白色多于红色。年轻兔子的趾甲短而平直，隐约可见;中年兔子的趾甲锐利而显露;老年兔子的趾甲显露出1/2的毛外。

The age classification method is to determine the age of a long haired rabbit based on the color and shape of its toenails. The base of the nails is pink, and the tips are white. The red color on the toenails of 1-year-old rabbits is basically equal to the white color on the toenails. The white color on the toenails of rabbits over 1 year old is more than red. The toenails of young rabbits are short and straight, faintly visible; The toenails of middle-aged rabbits are sharp and exposed; The toenails of elderly rabbits show half of their fur.