Journal ArticleDOI
The nutrition of the early weaned lamb:I. The influence of protein concentration and feeding level on rate of gain in body weight
R. P. Andrews,E. R. Ørskov +1 more
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The results agree reasonably well with estimates of protein requirements for lambs given by the Agricultural Research Council (1965) and the overall optimum dietary crude protein concentration for growth between 16 and 40 kg body weight was about 17·0, 15·0 and 11·0% when the mean digestible energy intake was 3·0.Abstract:
The live-weight gains of male and female lambs were measured during growth from 16 to 40 kg live weight when five cereal-based diets varying in dietary crude protein concentration (from 10 to 20%) were given at three levels in a 5×3×2 factorial design.Males grew faster than females by about 15% (P < 0·001); this difference increased with age and with the amount of feed given (P < 0·05). Growth rate responded linearly to increase in feeding level (P < 0·001) and curvilinearly to increase in dietary protein concentration (P < 0·01). A significant interaction (P < 0·01) occurred whereby growth increased with higher protein concentrations as feeding level increased.At the highest feeding level (near ad libitum) the results suggest that the optimum dietary crude protein concentration for growth was about 17·5, 15·0, 12·5 and 12·5% at body weights of 20, 25, 30 and 35 kg respectively. The overall optimum dietary crude protein concentration for growth between 16 and 40 kg body weight was about 17·0, 15·0 and 11·0% when the mean digestible energy intake was 3·0, 2·6 and 2·1 Mcal/day.The results agree reasonably well with estimates of protein requirements for lambs given by the Agricultural Research Council (1965).read more
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Journal ArticleDOI
Effects of crude protein content, protein degradability and energy concentration of the diet on growth and carcass characteristics of market lambs fed high concentrate diets
TL;DR: Diet 5 reduced growth rate, increased days on test, decreased feed efficiency, decreased dressing percentage, reduced internal fat and marginally decreased subcutaneous fat deposition, compared with a higher energy diet.
Journal ArticleDOI
Source and level of supplemental protein for growing lambs.
N. Dabiri,Michael L. Thonney +1 more
TL;DR: There was little difference in ADG or G:F between lambs fed the diets with 15 or 17% CP, suggesting that a CP level of 15% with supplemental protein from soybean meal would be optimal for 25- to 40-kg growing Finnsheep x Dorset lambs.
Journal ArticleDOI
The nutrition of the early weaned lamb:III. The effect of ad libitum intake of diets varying in protein concentration on performance and on body composition at different live weights
TL;DR: The percentages of nitrogen or of ether extract in the dry matter of the carcass or of the whole empty body were found to be related non-linearly to the empty-body weight at time of slaughter, which led to the finding of dietary effects on body composition during the growth period of the lambs and to the tendency for these differences in body composition to diminish as mature live weight was approached.
Journal ArticleDOI
The nutrition of the early weaned lamb. IV. Effects on growth rate, food utilization and body composition of changing from a low to a high protein diet
TL;DR: It is concluded however that the improvement in food conversion ratio following the change is attributable mostly to difference in the composition of gain, while derived estimates of the ratio of metabolizable energy intake above maintenance to the energy content of empty-body gain gave some suggestion of an improvement in efficiency of utilization of metabolized energy for gain.
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Protein utilization in ruminants. i. blood urea nitrogen as affected by protein intake.
Related Papers (5)
The nutrition of the early weaned lamb:II. The effect of dietary protein concentration, feeding level and sex on body composition at two live weights
R. P. Andrews,E. R. Ørskov +1 more