The effect of source of nitrogen and level of its supplementation on the performance of growing-fattening bulls

Levy, David A.; Holzer, Z.; Samuel, V.; Bruckental, I.

doi:10.1017/s0003356100002592

Cited by 3 publications

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References 7 publications

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“…On the other hand Steen (1988a), supplementing high and medium quality roughages given to Holstein steers by protein from barley, soya-bean meal (SBM) and FM, found no such differences. Holzer, Levy, Samuel and Bruckenthal (1986) and Levy, Holzer, Samuel and Bruckenthal (1986) indicated that the source of protein is important when the metabolizable energy (ME) concentration of the diet is low, and during the early stages of growth. In particular, the use of NPN at live weights below 240 kg is not efficient.…”

Section: Introductionmentioning

confidence: 99%

The effect of source of nitrogen used for supplementation of high wheat silage diets for cattle

1990

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Link to this article: http://journals.cambridge.org/abstract_S0003356100005201How to cite this article: A. Brosh, Z. Holzer and D. Levy (1990). The effect of source of nitrogen used for supplementation of high wheat silage diets for cattle. ABSTRACTFive diets of identical metabolizable energy (ME) content were formulated, in which wheat silage, made from a variety bred for a high proportion of ears to roughage, was incorporated at the rate of 480 g/kg dry matter (DM). Their calculated ME density was 11-4 MJ/kg DM, the protein concentration of four of the five diets was 150 g/kg DM, and that of the fifth was 87 g/kg DM. The effectiveness of protein supplementation of such diets by non-protein nitrogen (NPN), fish meal (FM) or soya-bean and cottonseed oil meals (SBM and CSM) was studied in a digestibility and nitrogen balance trial, and in a feeding trial using Friesian and beef breed young bulls. One diet served as a negative control (NC). The apparent digestibility of organic matter (kg/kg DM) was 0-709, 0-708, 0-704, 0-680 and 0-667 (s.e. 00125) and nitrogen retention (g/kg M 075 per day) was 0-20, 0-65, 0-65, 0-64 and 0-68 (s.e. 0-059; P < 0-01) for the NC, NPN, FM, CSM and SBM supplemented diets, respectively. The feeding trial was divided into two periods; the first 100 days, and from day 101 to slaughter. The NC groups of both breeds gained significantly less in both periods of the experiment than did the supplemented groups. There were no significant differences among the supplemented groups.

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Section: Introductionmentioning

confidence: 99%

The effect of source of nitrogen used for supplementation of high wheat silage diets for cattle

1990

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Nutritional adaptation of heifers to diets containing poultry litter

Arieli

Pecht

Zamwell

et al. 1991

Livestock Production Science

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Effect of dietary protein concentration and source on the growth rate and on body composition of Holstein-Friesian male calves

et al. 2000

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Holstein-Friesian male calves, aged 160 to 450 days, and of live weight 180 to 530 kg, were used to determine the effects of dietary nitrogen level and dietary nitrogen source on performance. Experiment 1, tested dietary nitrogen level, and involved two trials with three dietary-nitrogen levels and equal dietary metabolizable energy (ME) 11·7 MJ/kg dry matter (DM). The crude protein (CP) level was reduced in the course of the trials by 40 g/kg, the experimental average CP in the diets being 146, 126 and 106 g/kg for the high (HP), medium (MP) and the low protein (LP) diets, respectively. The urea space (US) for estimation of body protein deposition and the rumen volume for calculation of empty body weight were measured in trial A of experiment 1. Experiment 2 involved four diets of equal ME concentrations; (11-7 MJ/kg DM), in three of which the CP contents were equal but from different sources: (a) 110 g/kg, all of it true protein (TP), negative control; (b) 130 g/kg, all of it TP; (с) 130 g/kg CP, 20 g/kg of it is poultry litter (PL) protein; (d) 130 g/kg CP, 40 g/kg of it is PL protein. Significantly lower US and ratio of US to live weight were found in the calves on the LP diet, from the age of 265 days than in the calves on the other diets. The ratio of US to live weight significantly decreased with increasing age in all protein level treatments. Until the age of 300 days the rumen volume was significantly higher on the LP diet than on the other diets. Calves on the HP diet had the highest daily gain and carcass gain. The recommendation to reduce the dietary protein as age increased to lower than 120 g/kg caused a reduction in the energy retained from the diet but protein deposition was not impaired. Protein deposition was impaired when the CP was reduced by 20 g/kg below the level recommended by the National Research Council. The inclusion of poultry litter in the diet, with ME concentration being maintained, did not reduce the rate of live-weight gain, and improved food conversion efficiency.

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The effect of source of nitrogen and level of its supplementation on the performance of growing-fattening bulls

Cited by 3 publications

References 7 publications

The effect of source of nitrogen used for supplementation of high wheat silage diets for cattle

The effect of source of nitrogen used for supplementation of high wheat silage diets for cattle

Nutritional adaptation of heifers to diets containing poultry litter

Effect of dietary protein concentration and source on the growth rate and on body composition of Holstein-Friesian male calves

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