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The aim of this study was to assess the effect of exclusion of roughage from the ration of early weaned lambs. The experiment was carried out with 30 lambs from the Blackhead Pleven sheep breed weaning at 19.6days of age with an weight of 9.3kg and divided in two groups. The lambs deprived of roughage intake by 26.8% more wheat grain, which is a prerequisite for a smaller expense of protein 4.6% and higher energy expenditure by 7.3%per kg gain. Average daily gain of lambs deprived of roughage was 2.9% less than lambs who received alfalfa hay (P>0.05). Lambs deprived of roughage have a higher carcas syield (P<0.05) and they accumulate by 9.2% more separable internal fat, which influenced the higher fatness, compared with lambs who received alfalfa hay. Insignificance was detected in the chemical composition of meat and weight of internal organs between the two groups of lambs. Keywords

The objective of this study was to compare the growth rate, rumen development and some quality parameters of carcass and meat in lambs weaned at 25 and 70 days of age. The average live weight gain during experimental period was 268 g per day for suckling lambs and 233 g per day for lambs on dry feed. The difference of 13.1% in daily gain was not significant at P<0.05. The lambs weaned at 25 days of age showed tendency for higher dressing percentage and carcass weight, more separable internal fat, and better carcass fattiness (P>0.05), compared to those weaned at 70 days of age. Therefore it is possible to obtain approximately the same growth in live weight and carcass in lambs weaned at 25 and 70 days of age. The lambs weaned at 25 kg live weight had higher weight of internal organs than the lambs weaned at 70 days, but the difference was significant (P<0.05) only for lung liver, small intestine, thick intestine and rumen. The length and thickness of rumen papillae were higher in lambs weaned at 25 days of age compared to the lambs weaned at 70 days of age (P<0.05). Significantly thicker was the rumen wall in the lambs weaned at 25 days of age compared to the weaned at 70 days (P<0.05).

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