In order to facilitate the identification and individual production performance measurement, breeding, etc., the individual numbering should be performed after the lamb is born. There are four kinds of individual numbers: ear tag method, tattoo method, ear-cutting method, and horn-shaping method. The first two are more commonly used.
1) Ear tag method: Use round aluminum or rectangular hard plastic ear tag, first play (or write) on the ear tag number, and then wear in the ear in place. Generally, there are fewer holes in the upper rim of the ear, and it is installed. Ear tags are numbered with the species, year, and individual number; the first letter of the species's pinyin is used, and the year number is the fourth digit of the Gregorian year. For example, the Chinese Merino sheep are represented as “ZMâ€. Individual numbers can be based on the size of each flock, taking 3 or 4 digits; singles for the mantissa stands for rams and doubles for ewes. For example, "ZM7041" represents the Chinese Merino ram born in 2007 and has an individual number of 041. Tapping pins, bayonet clamps, piercing ear clamps, square ear tags, round ear tags, strip ear tags, and ram's branding numbers.
2) Tattooing method: The numbering rule is the same as that of the ear tag method, except that it adopts the method of acupuncturing the inner surface of the ear (left ear or right ear) on one side of the sheep with ink.
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