EurekaMag
+ Translate
+ Most Popular
Cunninghamia lanceolata plantations in China
Mammalian lairs in paleo ecological studies and palynology
Studies on technological possibilities in utilization of anhydrous milk fat for production of recombined butter-like products
Should right-sided fibroelastomas be operated upon?
Large esophageal lipoma
Apoptosis in the mammalian thymus during normal histogenesis and under various in vitro and in vivo experimental conditions
Poissons characoides nouveaux ou non signales de l'Ilha do Bananal, Bresil
Desensitizing efficacy of Colgate Sensitive Maximum Strength and Fresh Mint Sensodyne dentifrices
Administration of fluid by subcutaneous infusion: revival of a forgotten method
Tundra mosquito control - an impossible dream?
Schizophrenia for primary care providers: how to contribute to the care of a vulnerable patient population
Geochemical pattern analysis; method of describing the Southeastern limestone regional aquifer system
Incidence of low birth weights in a hospital of Mexico City
Tabanidae
Graded management intensity of grassland systems for enhancing floristic diversity
Microbiology and biochemistry of cheese and fermented milk
The ember tetra: a new pygmy characid tetra from the Rio das Mortes, Brazil, Hyphessobrycon amandae sp. n. (Pisces, Characoidei)
Risk factors of contrast-induced nephropathy in patients after coronary artery intervention
Renovation of onsite domestic wastewater in a poorly drained soil
Observations of the propagation velocity and formation mechanism of burst fractures caused by gunshot
Systolic blood pressure in a population of infants in the first year of life: the Brompton study
Haematological studies in rats fed with metanil yellow
Studies on pasteurellosis. I. A new species of Pasteurella encountered in chronic fowl cholera
Dormancy breaking and germination of Acacia salicina Lindl. seeds
therapy of lupus nephritis. a two-year prospective study

Metabolizable amino acids and energy requirements of Nellore and crossbred Angus × Nellore bulls fed rations of different crude protein concentrations


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



ISSN/ISBN: 1751-732X

PMID: 33516027

DOI: 10.1016/j.animal.2020.100036

Growth rate of cattle depends on their genetic makeup and nutrient intake. Moreover, increased growth rate may lead to increased amino acid (AA) requirements. Therefore, we evaluated the AA content of the empty body and estimated the net AA and energy requirements of purebred and crossbred beef bulls fed rations of different dietary CP concentrations. We performed a comparative slaughter experiment with 24 Nellore and 24 Angus × Nellore (A × N) bulls (8 months; initial shrunk BW: Nellore = 208.0 ± 12.78 kg; A × N = 221.9 ± 14.16 kg). Eight bulls (four Nellore and four A × N) were designated as the reference group, eight bulls (four Nellore and four A × N) were fed to maintenance level and 32 bulls (16 Nellore and 16 A × N) were fed ad libitum. The 32 bulls fed ad libitum were distributed using a completely randomized design in a 2 × 3 factorial scheme with two genetic groups (Nellore or A × N) and three dietary CP contents (100, 120 or 140 g CP/kg DM), being four groups with five bulls and two groups with six bulls. The experimental period lasted for 224 days. There were no interactions (P ≥ 0.056) between the dietary CP contents and genetic groups for any of the response variables. The dietary CP contents did not affect (P ≥ 0.062) the AA content in the empty body (g/kg empty BW [EBW]), with exception for Tryptophan (P = 0.027, linear effect). The dietary CP contents did not affect (P ≥ 0.051) AA content in the empty body (g/100 g of CP), with exception for Alanine (P = 0.013) that responded quadratically to dietary CP increase. The equations to estimate the net Lysine (Lys) and Methionine (Met) requirements (g/100 g of CP) were: Lys = 5.1 × EBW0.0594 and Met = 1.7 × EBW0.0255. Metabolizable Lys and Met to metabolizable energy (ME) ratios decreased as bulls EBW increased. Also, the metabolizable protein to ME ratio decreased as bulls EBW increased. In conclusion, the present study provides useful information regarding net and metabolizable requirements of AA of purebred and crossbred beef bulls. In the future, after the validation of the equations, these results can be used to calculate the AA requirements for growth of purebred and crossbred beef bulls. Nevertheless, it is important to highlight that the small sample size was one limitation of this present experiment.

Please choose payment method:






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

Accession: 072120067

Download citation: RISBibTeXText

Related references

Protein requirements of Nellore cattle and Nellore crossbred with Angus and Simmental. Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science 40(10): 2235-2243, 2011

Protein requirements of Nellore cattle and Nellore crossbred with Angus and Simmental. Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science 40(10): 2235-2243, 2011

Energy nutritional requirements for females of Nellore, Nellore x Angus and Nellore x Simmental fed on two forage: concentrate ratios. Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science 41(3): 753-761, 2012

Protein requirements for females of Nellore, Nellore × Angus and Nellore × Simmental fed on two forage: concentrate ratios. Revista Brasileira de Zootecnia 41(3): 762-770, 2012

Protein requirements for females of Nellore, Nellore x Angus and Nellore x Simmental fed on two forage: concentrate ratios. Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science 41(3): 762-770, 2012

Carcass characteristics and sensorial evaluation of meat from Nellore steers and crossbred Angus vs. Nellore bulls. Acta Scientiarum. Animal Sciences 39(4): 437-448, 2017

Energy and protein requirements for Angus and Nellore young bulls. Livestock Science 195: 67-73, 2017

Energy and protein requirements for growth and maintenance of F1 Nellore x Red Angus bulls, steers, and heifers. Journal of Animal Science 85(8): 1971-1981, 2007

Efficiency of metabolizable energy utilization for maintenance and weight gain and requirements of metabolizable energy and total digestible nutrients of Nellore bulls. Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science 30(3): 904-910, 2001

Efficiency of metabolizable energy utilization for weight gain and requirements of metabolizable energy and total digestible nutrients in F1 simental x Nellore bulls. Revista Brasileira de Zootecnia 28(2): 368-373, 1999

Carcass evaluation of young crossbred 1/2 Beefalo plus 1/2 Nellore and 1/2 Canchim plus 1/2 Nellore and commercial type Nellore bulls. Revista Brasileira de Zootecnia 27(4): 797-800, 1998

Efficiency of metabolizable energy utilization for maintenance and weight gain and metabolizable energy and total digestible nutrients requirements of F1 Limousin x Nellore bulls. Revista Brasileira de Zootecnia 31(3): 1286-1293, 2002

Efficiency of metabolizable energy utilization for maintenance and weight gain and metabolizable energy and total digestible nutrients requirements of F1 Limousin x Nellore bulls. Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science 31(3): 1286-1293, 2002

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

Nutritional requirements of energy, protein and macrominerals for maintenance and weight gain of young crossbred Nellore x Holstein bulls on pasture. Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science 41(3): 734-745, 2012