|Dietary group||ADG (g/d)||ADG (lbs/d)|
|Ad libitum concentrate|| |
|Restricted concentrate|| |
|Zero grazing (forage)|| |
|Fresh grass (grazing)|| |
Compared to the lambs fed ad libitum concentrate, the lambs fed restricted concentrate diets required an additional 20 days to reach slaughter weight (103.4 lbs). The forage-fed lambs required 40 additional days of feeding.
The lambs fed ad libitum concentrate had better feed conversion than those on mixed or forage diets. Concentrate-fed lambs had higher body condition scores and carcass ratings than those fed mixed or forage diets.
As would be expected, the carcasses from the concentrate-fed lambs had more back fat than carcasses from any other feeding group. Carcass yields were also higher, attributed primarily to a lighter full digestive tract.
In contrast, forage feeding produced lambs with similar muscle development and color of lean, but with less fat.
Source: Small Ruminant Research Journal, November 2010.