EurekaMag
+ Translate
+ Most Popular
Gaucher's disease;thirty-two years experience at Siriraj Hospital
A study of Macrobathra Meyrick from China (Lepidoptera, Cosmopterigidae)
First occurrence in ores of tetragonal chalcocite
Effects of trace element nutrition on sleep patterns in adult women
N.Z. range management guidelines. 2. Design of grazing management systems for tussock country
A case of lipoma of the esophagus
A revision of world Acanthosomatidae (Heteroptera: Pentatomidae): keys to and descriptions of subfamilies, tribes and genera, with designation of types
Life history of the coronate scyphozoan Linuche unguiculata (Swartz, 1788)
Perceptual restoration of obliterated sounds
Mutagenicity studies on two chromium(III) coordination compounds
The formation of the skeleton. I. Growth of a long bone. 1st appearance of a center of calcification
Leucopenia and abnormal liver function in travellers on malaria chemoprophylaxis
The joint commission: four key root causes loom large in sentinel event data
Treatment of vitiligo with topical 15% lactic acid solution in combination with ultra violet-A
Behaviour of dairy cows within three hours after feed supply: I. Influence of housing type and time elapsing after feed supply
Observations of the propagation velocity and formation mechanism of burst fractures caused by gunshot
Management and control of patients with type 2 diabetes mellitus in Lebanon: results from the International Diabetes Management Practices Study (IDMPS)
The diet composition and nutritional knowledge of patients with anorexia nervosa
Physoporella croatica Herak, 1958 of the Slovak karst Anisian (Slovakia, the West Carpathians Mts.)
Bright lights, big noise. How effective are vehicle warning systems?
Ein Plesiosaurier-Rest mit Magensteinen aus mittlerem Lias von Quedlinburg
Incidence of Chlamydia trachomatis in patients with sterility
Monster soup: the microscope and Victorian fantasy
Preliminary tests with residual sprays against poultry lice
Duration of the life of plants in phylogeny

Effects of increasing dietary crude protein levels on nitrogen balance and metabolizable protein requirements for maintenance in Nellore cattle


Effects of increasing dietary crude protein levels on nitrogen balance and metabolizable protein requirements for maintenance in Nellore cattle



Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science 36(4): 1212-1217



ISSN/ISBN: 1806-9290

DOI: 10.1590/s1516-35982007000500030

The objective of this trial was to investigate the effects of increasing dietary crude protein levels on N balance and metabolizable protein requirements for maintenance in Nellore heifers, bulls and steers averaging 16 months of age and body weight of 254.8, 285.1, and 265.6 kg, respectively. Animals were blocked by sexual category (heifers, bulls and steers) and randomly assigned to treatments in three replicated 4 x 4 Latin squares. Diets contained the following CP levels: 7, 10, 13, and 15%. Estimation of fecal DM output and duodenal DM flow was done using the internal marker indigestible ADF. Total collection of urine was conducted from day 13 to day 14 on each period. Metabolic fecal nitrogen, urinary endogenous losses and total endogenous losses were all estimated using a regression approach. No significant effect of sexual category was observed for any of the studied variables, excepting for N intake that was greater on steers than heifers. N intake, urinary and fecal N excretions, and N balance increased linearly when the dietary CP level varied from 7 to 15%. Fecal metabolic N and urinary endogenous N averaged 6.69 gN/kg of DMI and 0.133 g N/kg(0.75) across diets, respectively. The net protein requirement was estimated as 0.431 gN/kg(0.75) or 2.69 g of protein/kg(0.75). No effect of sexual category on metabolizable protein requirements for maintenance (approximately 4.0 g/k(0.75)) was observed in this trial.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 066205028

Download citation: RISBibTeXText

Related references

Effects of increasing dietary crude protein levels on nitrogen balance and metabolizable protein requirements for maintenance in Nellore cattle. Revista Brasileira de Zootecnia 36( 4, Suppl.): 1212-1217, 2007

Metabolizable amino acids and energy requirements of Nellore and crossbred Angus × Nellore bulls fed rations of different crude protein concentrations. Animal: An International Journal of Animal Bioscience 15(1): 100036, 2020

Ruminal fermentation characteristics and protein fraction effects on metabolizable protein synthesis of beef cattle fed different levels of crude protein. Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science 38(12): 2506-2515, 2009

Effects of Dietary Protein on Ruminal Fermentation, Nitrogen Utilization and Crude Protein Maintenance in Growing Thai-indigenous Beef Cattle Fed Rice Straw as Roughage. Journal of Animal and Veterinary Advances 9(18): 2396-2400, 2010

Increasing crude protein levels in diets of Nellore cattle: intake, ruminal and total tract digestibility, microbial protein synthesis, and ruminal metabolism. Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science 36(4): 1199-1211, 2007

Increasing crude protein levels in diets of Nellore cattle: intake, ruminal and total tract digestibility, microbial protein synthesis, and ruminal metabolism. Revista Brasileira de Zootecnia 36( 4, Suppl.): 1199-1211, 2007

Increasing crude protein levels in diets of Nellore cattle: intake, ruminal and total tract digestibility, microbial protein synthesis, and ruminal metabolism. Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science 36(4): 1199-1211, 2007

Effects of crude protein dietary levels on nitrogen mass balance of commercial broilers. Poultry Science 87: 142, 2008

Nitrogen balance and metabolizable energy determination of diets with different crude protein levels for broiler chickens. Arquivo Brasileiro de Medicina Veterinaria E Zootecnia 63(3): 659-669, 2011

Oscillating and static dietary crude protein supply. I. Impacts on intake, digestibility, performance, and nitrogen balance in young Nellore bulls. Translational Animal Science 3(4): 1205-1215, 2019

Does a reduction in dietary crude protein content affect performance, nutrient requirements, nitrogen losses, and methane emissions in finishing Nellore bulls?. Agriculture, Ecosystems and Environment 223: 239-249, 2016

Effects of Dietary Crude Protein Levels on Intake, Digestibility, and CRUDE PROTEIN BALANCE OF GROWING KOREAN NATIVE GOATS (CAPRA HIRCUS COREANAE). Journal of Animal and Plant Sciences 28(4): 981-988, 2018

Oscillating and static dietary crude protein supply: II. Energy and protein requirements of young Nellore bulls. Translational Animal Science 3(4): 1216-1226, 2019

Effects of dietary ruminally degradable starch and ruminally degradable protein levels on urea recycling, microbial protein production, nitrogen balance, and duodenal nutrient flow in beef heifers fed low crude protein diets. Canadian Journal of Animal Science 93(1): 123-136, 2013

Crude protein levels on beef cattle diets: ruminal metabolism, nitrogen balance, and microbial protein synthesis. Revista Brasileira de Zootecnia 35(1): 203-210, 2006