The nutrition of the early-weaned calf VIII. The effect on nitrogen retention of diets containing different levels of fish meal

Self Cite

1. A growth trial and nitrogen balance studies were carried out on 32 early-weaned calves fed on a basal diet containing fish meal or diets in which the fish meal nitrogen was partially replaced by urea or ammonium acetate or totally replaced by urea.2. Growth rate and feed conversion efficiency were highest on the fish meal diet and fell as urea replaced the fish meal.3. Rumen ammonia levels and urinary nitrogen excretion were highest, and nitrogen retention lowest, in the calves receiving the diet in which fish meal nitrogen was completely replaced by urea nitrogen.

Section: Rowett Research Institute Bucksbum Aberdeenmentioning

confidence: 99%

The nutrition of the early-weaned calf. X. The effect of replacement of fish meal with either urea or ammonium acetate on growth rate and nitrogen retention in calves fed ad libitum

Kay¹,

MacLeod²,

McKiddie³

et al. 1967

Self Cite

“…It follows, therefore, that the mean values for digestible protein intake of these calves represent the minimum protein requirements for the live-weights and live-weight gains observed. The value of 240 g./day is also below the allowance suggested by Preston, Whitelaw, MacLeod and Philip (1965) of between 267 and 342 g. digestible protein/day for Friesian calves of 82 kg. live-weight gaining at 0-91 kg./day, the minimum digestible protein requirement will be 240 g./day, and for a calf of 78-6 kg.…”

Section: Discussionmentioning

confidence: 54%

The protein requirement of the ruminant calf. II. Further studies on the effect of protein content of the concentrate mixture on the performance of calves weaned at an early age

Stobo¹,

Roy²,

Gaston³

1967

“…on diets varying in digestibility. A considerable amount of information has been obtained recently on the nitrogen metabolism of young calves fed on all-concentrate diets (see Preston, Whitelaw, MacLeod andBowers, Preston, McDonald, MacLeod and but there is less information of a similar nature for lambs fed on such diets. The following experiment was carried out to assess the intake of energy and utilisation of dietary nitrogen by lambs fed ad libitum on three simple all-concentrate diets during the latter stages of fattening.…”

Section: A Note On Energy Intake and Nitrogen Balance Of Fattening Lamentioning

confidence: 99%

A note on energy intake and nitrogen balance of fattening lambs given all-concrate diets

Davies

1966

The growth rate and food conversion efficiency of fattening lambs given all-concentrate diets have been reported by Philip Preston and Greenhalgh (1964). The lambs were weaned abruptly at 8 weeks old and fed thereafter ad libitum on cereal and protein supplement. Owen, Davies and Ridgman (1965) have reported the same measures of performance for artificially reared lambs fed from 30 lb. to slaughter at 75 lb. on diets varying indigestibility. A considerable amount of information has been obtained recently on the nitrogen metabolism of young calves fed on all-concentrate diets (see Preston, Whitelaw, MacLeod and Philip, 1965, and Bowers, Preston, McDonald, MacLeod and Philip, 1965) but there is less information of a similar nature for lambs fed on such diets. The following experiment was carried out to assess the intake of energy and utilisation of dietary nitrogen by lambs fed ad libitum on three simple all-concentrate diets during the latter stages of fattening.