This experiment was conducted to investigate the effect of the body weight at the beginning of fattening on the growth rate and carcass characteristics of Suffolk male lambs. The period of fattening was 2 months from 8 months old. Nineteen male lambs were grouped into the following four groups of the body weight at beginning of the treatment; 1) 30kg, 2) 35kg, 3) 40kg, and 4) 45kg. To each group of 1), 2) and 3), five male lambs were allocated and four to the heaviest body weight group.
1. The heavier body weight at the beginnig of the treatment resulted in the lower growth rate. The average daily gain in each group was 155g, 142g, 128g and 115g for the 30kg, 35kg, 40kg and 45kg body weight group, respectively.
2. Increasing with the body weight at the beginning of the treatment, the body weight at the end of the treatment and the dressing percentage increased. The dressing percentage was 49.0%, 49.3%, 50.4% and 51.2% for the group of 30kg, 35kg, 40kg and 45kg, respectively.
3. Fat thickness tended to increase with increasing the body weight at the beginning of fattening.
4. Under the conditions of this experiment, the body weight of male lamb at the beginning of the fattening should be more than 35kg for the better carcass characteristics and the better carcass grading of lambs.

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1. Suffolk male lambs were grazed on the orchard grass (Dactylis glomerate, L.), perennial ryegrass (Lolium perenne, L.) or timothy (Phleum pratense, L.) pasture for 98 days to study the effect of the grass species on the body weight gain and the carcass characteristics.
2. The average stocking rates were 17.4, 18.6 and 14.0 lambs/ha on the orchardgrass, perennial ryegrass and timothy pasture, respectively.
3. The body weight gain was 120, 122 and 141 g/day on the orchardgrass, perennial ryegrass and timothy pasture, respctively.
4. On the timothy pasture, the final body weight of lambs was 46.1kg and quality of the “lamb” was better than on other pastures.
5. The total carcass weight produced was 86.2, 96.0 and 86.9kg per hectare on the orchardgrass, perennial ryegrass and timothy pasture, respectively.

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1. The body weight gain and carcass characteristics of Suffolk male lambs grazed for 110 days on the grass pastures receiving two levels (480 and 1920kg/ha) of a compound fertilizer (12 : 9 : 12) were studied. And also, Suffolk X Scottish Half-bred were compared with Suffolk on the more fertilized pastures.
2. The average stocking rate was 15.6 lambs/ha on the less fertilized pasture and 26.4 lambs/ha on the more fertilized pasture.
3. The body weight gain of Suffolk lambs was 79g/day on the less fertilized pasture and 111g/day on the more fertilized pasture. Suffolk Lambs on the more fertilized pasture reached to 20.5kg of the carcass weight, but they were unsuitable for “lamb” in terms of fat thickness and rib eye area.
4. The body weight gain of Suffolk X Scottish Half-bred lambs on the more fertilized pasture was 110g/day. They did not reach to 20kg of the carcass weight, but they were superior to Suffolk lambs in terms of fat thickness and rib eye area.
5. Carcass output per hectare was 54.3kg on the less fertilized pasture and 135.3kg on the more fertilized pasture.

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