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
Digestion of concentrates in sheep. 4. The effects of urea on digestion, nitrogen retention and growth in young lambs.
TL;DR: It is suggested that barley diets for early-weaned lambs can with advantage be supplemented with non-protein N to increase the crude protein in the dry matter up to about 12%.
Journal ArticleDOI
Effects of live weight and energy intake on nitrogen balance and total N requirement of lambs.
J. L. Black,D. A. Griffiths +1 more
TL;DR: Results of 298 nitrogen balance studies from experiments with male cross-bred lambs, which had been either fasted, or fed entirely on liquid diets of varying protein content at various energy intakes up to ad lib, were used to quantitatively describe the effects of the amount and quality of absorbed protein, energy intake and live weight on N balance and total N requirement of lambs.
Journal ArticleDOI
Associative effects of mixed feeds. II. The effect of dietary addition of bicarbonate salts on the voluntary intake and digestibility of diets containing various proportions of hay and barley
TL;DR: In the first two experiments, fixed amounts of barley were offered, with hay freely available, while in the second, fixed ratios of hay and barley are offered ad libitum as mentioned in this paper, and it was concluded that negative associative effects could be largely avoided if the rumen pH was maintained above the level inhibitory to cellulolysis.
Journal ArticleDOI
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
TL;DR: In an experiment with ninetynine lambs the effects on the body composition of male and female lambs were examined when five diets containing different concentrations of crude protein (in the range 10-20%) were given at three levels of feeding as mentioned in this paper.
Journal ArticleDOI
Optimum dietary crude protein level for finishing Awassi lambs.
TL;DR: Results suggest that the optimum CP concentration is 16% and that any increase above this level will not result in any improvement in production.
References
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Journal ArticleDOI
Control of Estrus and Lambing Performance in Cycling Ewes Fed 6-Methyl-17-Acetoxyprogesterone
Journal ArticleDOI
Effect of energy level on the protein requirement of lambs fattened with and without stilbestrol.
J. R. Jones,D. E. Hogue +1 more
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Protein and energy requirements of lambs, weaned at six to eight weeks of age as determined by growth and digestion studies.
G. S. Ranhotra,R. M. Jordan +1 more
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A study of the protein requirements of fattening feeder lambs.
Journal ArticleDOI
The influence of the amount of protein and energy in the ration of replacement ewe lambs on body weight gains and wool production
TL;DR: Body weight gains and wool growth of lambs fed rations containing wheat straw or oat hulls did not increase to so great an extent as those fed corn starch, which would indicate that energy was a limiting factor for ma...
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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