Intensive beef production. 12. Replacement of concentrates with chopped dried grass

Kay, M.; Massie, R.; Macdearmid, A.

doi:10.1017/s0003356100029470

Cited by 5 publications

(2 citation statements)

References 6 publications

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“…Moreover there is no direct evidence that fasting metabolism is a satisfactory basis for estimating energy retention in growing animals. Tests made to date of the ME system in practical feeding trials have suggested that it tends to overestimate performance particularly at higher body weights (Alderman, Morgan and Lessells, 1970;Kay, Massie and MacDiarmid, 1971).…”

Section: Introductionmentioning

confidence: 99%

Prediction of the Energy Requirements for Growth in Beef Cattle 1. The irrelevance of fasting metabolism

Webster¹,

Brockway²,

Smith³

1974

Anim. Sci.

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1. According to the Agricultural Research Council (1965) energy retention in cattle is predicted from metabolizable energy (ME) intake, the net availabilities of ME for maintenance (k m ) and for fattening (k f ) and measurements made of fasting metabolism (F). The present experiments were designed to examine the validity of the use of F as a basis from which to predict energy retention. 2. Four British Friesian and four Aberdeen Angus steers were fed, from weaning to slaughter at about 450 kg, a barley-based, pelleted diet at two levels calculated to yield overall efficiencies of retention of ME of 20% and 10% respectively. Successive measurements were made of the energy balance of each animal at intervals of 4 to 8 weeks. 3. The metabolizability of the diet was measured for both sheep and cattle. In both species metabolizability was greater at the higher level of feeding. In sheep k f measured directly or estimated from metabolizability was 0-61. 4. Measured values for F in cattle agreed closely with values given by the Agricultural Research Council. 5. Basal metabolism in the growing animal (F') was predicted by extrapolation to zero intake of measurements made on animals in positive energy balance. Log F' during growth was proportional to log body weight 073 . Expressed in terms of the usual exponent of metabolic body size, F' was about 440 kJ/kg 0 " 75 per 24 hr throughout growth. There were no major differences in F' attributable to breed or to level of food intake. 6. The results indicate that F is not a good basis from which to predict energy retention in steers.

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Section: Introductionmentioning

confidence: 99%

Prediction of the Energy Requirements for Growth in Beef Cattle 1. The irrelevance of fasting metabolism

Webster¹,

Brockway²,

Smith³

1974

Anim. Sci.

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“…IN earlier experiments the effects were examined of partially replacing dietary concentrates with straw (Kay, Macdearmid and MacLeod, 1970;Kay, Macdearmid and Massie, 1970) or dried grass (Kay, Massie and Macdearmid, 1971) on the live-weight gain of young British Friesian steers. Two growth trials (Trials 1 and 2) and one digestibility trial (Trial 3) are now reported in which the effects of substitution of either swedes (Brassica napus) or potatoes (Solatium tuberosum) for dietary concentrates were determined.…”

Section: Introductionmentioning

confidence: 99%

Intensive beef production 13. Replacement of concentrates with root crops

Kay¹,

Macdearmid²,

Massie³

1972

Anim. Sci.

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1. Two growth trials and a digestibility trial were carried out with a total of 84 British Friesian steers to investigate the substitution of root crops for a part of the concentrates in an all-concentrate diet. In Trial 1 six experimental diets were offered ad libitum and contained, on a dry-matter basis, (1) 100% concentrates, (2) 34%, (3) 66%, (4) 87% sliced swedes and (5) 66%, (6) 87% whole potatoes. In Trial 2, five diets were offered ad libitum and contained (1) 100% concentrates or (2) 34%, (3) 50%, (4) 66%, (5) 100% swedes. 2. In both the growth trials when the steers weighed less than 350 kg live weight, daily dry-matter intake was lower for steers offered the highest proportion of swedes than for steers offered concentrates. Substitution of potatoes for concentrates resulted in a higher daily dry-matter intake and daily live-weight gain than did substitution of swedes. 3. In Trials 1 and 2 rate of live-weight gain and in Trial 2 carcass gain were similar for steers on treatments 1 and 2. In Trial 2 liveweight gain declined from 1-05 to 0-87 kg/day and carcass gain declined from 0-62 to 0-51 kg/day between steers on treatments 1 and 5. 4. The replacement of concentrates with swedes or potatoes did not affect the overall digestibility of dry matter.

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Efficiencies of Energy Utilization during Growth

Webster¹

1976

Meat Animals

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Intensive beef production. 12. Replacement of concentrates with chopped dried grass

Cited by 5 publications

References 6 publications

Prediction of the Energy Requirements for Growth in Beef Cattle 1. The irrelevance of fasting metabolism

Prediction of the Energy Requirements for Growth in Beef Cattle 1. The irrelevance of fasting metabolism

Intensive beef production 13. Replacement of concentrates with root crops

Efficiencies of Energy Utilization during Growth

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