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Abstract. During the last ten years, the interest in precision farming technologies has increased. Next to crop and horticultural industries, they are also developing for livestock farming purposes. For dairy herds it is dairy management systems, but in meat production used technologies for control of fast growth and assessment of carcass quality. The use of ultrasound for recording purposes of lamb fattening results in Latvia is becoming more and more important. The aim of the research was to explain the changes of the ram (hereafter: lamb) muscle and fat layer depth during the fattening period by using ultrasound technologies. In study 45 fattening lambs are used, of which 24 were meat-type breeds (MT), and 21 Latvian Dark Head with meat-type crossbred (XX) lambs. At the beginning and at the end of fattening the age and live weight of lambs between the research groups did not differ. The Longissimus Dorsi (hereafter: LD) muscle depth of the MT breed lambs was on average 23.6, but XX lambs -24.1 mm, significant differences were obtained to the fat tissue depth, respectively 2.04 and 1.77 mm (p ≤ 0.05). The MT breed lamb LD muscle depth during fattening increased by an average of 6.05 mm, which is 1.09 mm more than for the XX group lambs (p ≤ 0.05). The depth of fat tissue increase by the research groups was similar on average of 2.0 mm. During intensive fattening of the MT breed lambs per each fatty tissue mm the depth of muscle increased by an average of 3.09 mm and for the XX lamb group about 2.94 mm.