INFLUENCE OF FEEDING INTENSITY AND LIVE M ASS ON NUTRIENT CONTENT OF LEAN, ADIPOSE AND BONE TISSUES AND TENDONS OF CARCASS OF SIMMENTAL BULLS, HEIFERS AND STEERS

In the fattening experiment 54 bulls, 45 heifers and 45 steers of the German Simmental breed were feed either on a high energy level (maize silage ad libitum and 1.8 kg concentrate) or on a low energy level (ma ize silage restrictively and 1.0 kg concentrate). Slaughter points wer e at 200 kg (beginning of the experiment), 350 kg, 425 kg (only heifer s), 500 kg and 575 kg respectively 650 kg (only bulls and steers) of l ive mass. One half was cut into 13 joints following the method of DLG and afterwards separated into lean, adipose and bone tissues as well a s tendons. In these tissues of the cuts chemical analysis of fat, prot ein and ash was accomplished. From these data nutrient content of lean , adipose and bone tissue and tendons was calculated for the whole car cass. The fat content of lean tissue increased under intensive feeding conditions for bulls from 1.6% to 3.3%, for heifers from 2.3% to 5.1% and for steers from 1.7% to 6.2%. The low feeding intensity led to an increase of 4.3% for heifers and 5.4% for steers, whereas the fat con tent of lean tissue of bulls not altered. The mean protein content of 21.5% and the mean ash content of 1.3% of the lean tissue was not infl uenced due to live mass, sex and feeding intensity. On the high energy level the fat content of adipose tissue increased from 43% to 66% for bulls, from 57% to 74% for heifers and from 50% to 77% for steers. Th e restrictive feeding caused only fat contents of 58% for bulls and 71 % for heifers respectively steers. The mean protein content of the adi pose tissue decreased from 11% to 7%, whereas the mean ash content of 0.28% showed no changes with rising live mass and due to sex and feedi ng intensity. The mean fat content of the bone tissue (15.2%-19.7%) wa s as well as the mean protein content of 21.3% slightly influenced by live mass, sex and feeding intensity. The ash content increased with r ising live mass from 24.7% to 28.4% (intensive feeding) respectively 3 0.7% (restrictive feeding). With rising live mass the fat content of t endons increased from 14% to 16-25%. Heifers and steers showed in comp arison to bulls as well as animals on the high energy level in compari son to animals on the low energy level higher fat contents in the tend ons. The mean protein content of 27.6% and the mean ash content of 0.7 8% was not altered due to live mass, sex and feeding intensity