The nutritive value of rumen micro-organisms in ruminants

Storm, E; Ørskov, E. R.

doi:10.1079/bjn19830114

Cited by 170 publications

(40 citation statements)

References 30 publications

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“…Storm et al (1983) indicaram a eficiente utilização da proteína microbiana ruminal de cordeiros em crescimento mantidos pela nutrição intragástrica. Porém, a proteína fornecida pela síntese microbiana ruminal é inadequada para sustentar a alta taxa de crescimento, requerido nos sistemas intensivos de produção.…”

Section: R Bras Zootec V31 N3 P1307-1314 2002unclassified

Desempenho de cordeiros alimentados com diferentes níveis protéicos

Zundt¹,

Macêdo²,

Martins³

et al. 2002

R. Bras. Zootec.

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RESUMO -O experimento foi conduzido com o objetivo de avaliar níveis crescentes de proteína bruta (PB) na dieta de cordeiros em confinamento, por meio de seus efeitos sobre o desempenho animal. Trinta e dois cordeiros "tricross" ( 1 / 2 Texel + ¼ Bergamácia + ¼ Corriedale), sendo 16 machos inteiros e 16 fêmeas, com idade média de 5 meses e peso vivo de 30 kg , foram alimentados durante 57 dias com dietas isoenergéticas (72% NDT), variando os níveis protéicos (12, 16, 20 e 24 % PB). Os animais foram identificados, pesados e distribuídos nos quatro tratamentos. Os cordeiros permaneceram em baias individuais, cobertas, com piso ripado e suspenso. Os parâmetros estudados foram ganho de peso, consumo de matéria seca, conversão alimentar e o custo de produção do quilograma de carcaça. A utilização de dietas, com diferentes níveis protéicos na terminação de cordeiros, mostrou efeito linear positivo para ganho de peso e negativo para conversão alimentar. Verificou-se que a utilização de dietas com níveis protéicos crescentes não influenciou o consumo de matéria seca dos cordeiros. Observou-se viabilidade econômica na terminação de cordeiros, utilizando-se dietas entre 12 e 24% de PB, entretanto, o maior retorno foi obtido com a ração contendo 12% PB. Não houve efeito de sexo para os parâmetros analisados.Palavras-chave: consumo, conversão alimentar, custo de produção, ganho de peso, ovinos, proteína Performance of Lambs Fed with Different Protein LevelsABSTRACT -The experiment was carried out to evaluate increasing crude protein (CP) levels in drylot lambs diet, and its effects on animal performance. Thirty two tricross lambs (1/2 Texel + ¼ Bergamácia + ¼ Corriedale), being 16 males and 16 females, with average age 5 months and live weight 30 kg, were fed for 57 days, with isoenergetic diets (72% TDN), but with different protein levels (12, 16, 20 and 24% PB). The animals were identified, weighted and distributed in the four treatments. The lambs were kept underroof in individual pens with lathing and a suspended floor. The studied parameters were weight daily gain, dry matter intake, feed efficiency, and cost per kilogram of carcass. The use of diets with different protein levels in lamb termination, showed a positive linear effect for weight daily gain and negative feed efficiency. It was verified that the use of diets with increasing protein levels did not influence the dry matter intake of the lambs. It was concluded that the diets between 12 and 24% crude protein were economical for finishing lambs in drylot, however, the largest return were gotten with the ration contends 12% CP. There were no sex effects for the analyzed parameters.

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Section: R Bras Zootec V31 N3 P1307-1314 2002unclassified

Desempenho de cordeiros alimentados com diferentes níveis protéicos

Zundt¹,

Macêdo²,

Martins³

et al. 2002

R. Bras. Zootec.

View full text Add to dashboard Cite

show abstract

“…A buffering solution was also infused at the rate of 2500 ml/d to maintain a rumen p k between 6-2 and 6.7, as previously described (Orskov et al 1979). Freeze-dried micro-organisms isolated from whole rumen contents (Storm & Orskov, 1983) were reconstituted in 2500 ml water daily and infused abomasally together with trace minerals and vitamins. The vessels holding the reconstituted microbial infusate were kept at Oo.…”

Section: Infusates and Infusion Proceduresmentioning

confidence: 99%

“…Large-scale isolation of rumen micro-organisms was described in an earlier paper in this series (Storm & Orskov, 1983). The present paper describes the results of four experiments in which RMO were infused abomasally in sheep otherwise maintained by intraruminal infusion of volatile fatty acids (VFA) and minerals (Orskov et al 1979).…”

mentioning

confidence: 99%

“…Using this method, the quantities of RMO and energy infused could be estimated accurately and varied independently of each other. A preliminary account of some of this work has already been published (Storm & Orskov, 1982).…”

mentioning

confidence: 99%

“…Furthermore, the AA composition of this material appears to be constant irrespective of dietary and animal conditions (Storm et al 1983). It has been difficult to obtain precise estimates of the nutritive value of microbial N for ruminants due to difficulties in isolating sufficient quantities of rumen micro-organisms (RMO) for experiments with large animals, though some evaluations of nutritive value have been undertaken using rats (Johnson et al 1944;McNaught et al 1954; Mason & Palmer, 1971).…”

mentioning

confidence: 99%

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