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
Protein energy relationships with particular references to energy undernutrition: A review
S.A. Chowdhury,E. R. Ørskov +1 more
TL;DR: During energy undernutrition, the use of the dietary protein-energy ratio to estimate tissue protein requirements has limited value for ruminants, even when based on absorbed amino acids, because endogenous fat can serve as a source of energy to fuel protein accretion.
Journal ArticleDOI
Protein requirements of growing lambs.
TL;DR: A large variation exists in the estimated protein requirements of growing and fattening lambs; differences in feedstuffs used for the various determinations, and particularly differences in the extent of degradation of dietary protein within the rumen and subsequent amino acid absorption, are likely to be principal causes.
Journal ArticleDOI
The effect in an intensive production system of type of cereal and time of weaning on the performance of lambs
TL;DR: The lambs weaned at either 13 or 20 weeks had a greater weight at weaned, a greater growth check at weaning and a lower rate of feed intake, while the lambs given diets ad libitum had a higher feed efficiency and growth rate.
Journal ArticleDOI
The effect of ingesting a saltbush and barley ration on the carcass and eating quality of sheepmeat.
TL;DR: The lower body-fat content and lower metabolisable energy and digestible organic matter intake did correlate with the sheep fed the S + B diet, having a significantly lower percentage of unsaturated fat and equal levels of saturated fat than the C treatment.
References
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Protein utilization in ruminants. i. blood urea nitrogen as affected by protein intake.
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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