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

Stobo, I. J. F.; Roy, J. H. B.; Gaston, Helen J.

doi:10.1017/s0003356100038241

Cited by 14 publications

(1 citation statement)

References 11 publications

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“…The results of these trials led to the establishment of a requirement of 15 % digestible crude protein (dcp), equivalent to about 17.5 % crude protein (cp). This is slightly more than Stobo et al (1967) regarded as optimal, namely 15 % cp.…”

Section: Introductionmentioning

confidence: 85%

The influence of the degradability of concentrate protein in the rumen and of the lysine content of the concentrate on growth and feed efficiency in early-weaned calves.

Veen¹,

Vahl²

1984

NJAS

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In two feeding trials involving 96 rearing calves each and based on a 2 x 3 factorial design, a comparison was made between concentrates containing rapidly and slowly rumen-degradable protein and among concentrates with lysine 6, 7 and 8 g/kg or 7, 8 and 9 g/kg. In a third trial involving 84 animals, 2 feeds containing rapidly and slowly degradable protein were compared. Calves were weaned at 6 weeks and remained in the trial an additional 5 to 6 weeks. Concentrates were fed freely from 21 days old and in 2 trials after weaning the calves were fed according to a plan based on body weight. Hay or prewilted grass silage was given freely. Difference in protein degradability between feeds with rapidly degradable protein and those with slowly degradable protein was 28 and 36% in the second and third trials. Treatments involving concentrates with slowly degradable protein resulted in a higher daily weight gain. Feed efficiency was usually improved. Increase in lysine content of the concentrate from 6 to 8 g/kg or from 7 to 9 g/kg resulted in a significant linear rise in daily weight gain and a linear rise in feed efficiency. In 2 of the 3 trials intake of roughage (1 x prewilted grass silage, 1 x hay) was positively affected by presence in the concentrate of slowly degradable protein. Lysine content of the concentrate had no effect on roughage intake. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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Section: Introductionmentioning

confidence: 85%

The influence of the degradability of concentrate protein in the rumen and of the lysine content of the concentrate on growth and feed efficiency in early-weaned calves.

Veen¹,

Vahl²

1984

NJAS

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References

1974

Intensive Beef Production

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The crude protein requirement of the early-weaned calf given urea, meat meal or soya bean meal with and without sulphur supplementation

Leibholz

Kang

1973

Anim. Sci.

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SUMMARYTwo experiments were conducted with 84 male British Friesian calves to estimate their nitrogen and sulphur requirements between 5 and 11 weeks of age. A basal 12 % crude protein (CP) diet was supplemented with meat meal, soya bean meal or urea to 15 or 18 % CP, and with sulphur to reduce the nitrogen to sulphur ratios of the diets to about 10 to 1.The weight gains and feed conversion ratios of the calves given the 12% CP diets were significantly poorer than those of the calves fed on the diets containing 15 or 18% CP, irrespective of the CP supplement used. The supplementation of the urea-containing diets with sulphur caused a significant increase in feed intake and weight gain.The digestibility of nitrogen and dry matter increased with increasing CP content of the diets and was greater for the diets supplemented with urea than for those supplemented with meat meal or soya bean meal. Sulphur additions also increased the nitrogen digestibility. The retention of nitrogen, when corrected for feed intake, was greater in the calves fed on the diets containing 18% CP than in those fed on the 15% and 12% CP diets.The supplementation of the diets with sulphur increased the digestibility of sulphur, its excretion in urine and its retention. The concentration of urea in the blood plasma increased with increasing dietary CP content, and was higher in calves given urea.

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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

Abstract: 1967). 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.

Cited by 14 publications

References 11 publications

The influence of the degradability of concentrate protein in the rumen and of the lysine content of the concentrate on growth and feed efficiency in early-weaned calves.

The influence of the degradability of concentrate protein in the rumen and of the lysine content of the concentrate on growth and feed efficiency in early-weaned calves.

References

The crude protein requirement of the early-weaned calf given urea, meat meal or soya bean meal with and without sulphur supplementation

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