EurekaMag.com logo
+ Site Statistics
References:
53,869,633
Abstracts:
29,686,251
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on LinkedInFollow on LinkedIn

+ Translate

Efficiency of metabolizable energy utilization for maintenance and weight gain and requirements of metabolizable energy and total digestible nutrients of calves fed rations with different forage levels



Efficiency of metabolizable energy utilization for maintenance and weight gain and requirements of metabolizable energy and total digestible nutrients of calves fed rations with different forage levels



Revista Brasileira de Zootecnia 27(5): 1031-1036



The work was realized to estimate the efficiency of metabolizable energy (ME)utilization for maintenance and weight gain, and the requirements of ME and total digestible nutrients (TDN) of growing calves fed with different forage levels in the diets. Forty-eight Holstein X Zebu bull calves, 60 days old with initial average live weight (LW) of 60 kg, were used. Eight animals were slaughtered at the beginning of the feeding trial to serve as reference. Thirty two animals were ad libitum fed with concentrate and chopped Coast-cross (Cynodon dactylon) grass hay and allotted to four groups of eight animals, in accordance with each feeding system, treatments (T). The following forage levels were used in the diet on the dry matter basis: T1=10, T2=25, T3=40, T4=55%, on a dry matter (DM) basis and eight animals were fed diets with 90% of rough age and 10% of concentrate(T5), slightly above maintenance (maintenance group). Four animals from each treatment were slaughtered when target 180 +- 10 kg LW (group 2) and the other four when target 300 +- 10 kg LW (group 1) and the animals at the maintenance group were slaughtered with variable weights and average age of those in the groups 1 and 2. The efficiencies of ME utilization for maintenance and weight gain were estimated by regression analysis, between net energy for maintenance or net energy for weight gain in function of ME of the diets. The ME and TDN requirements for animals of 100 and 300 kg LW, were 6.90 and 11.53 Mcal ME and 1.91 and 3.19 kg TDN/kg of empty body weight gain, respectively. The efficiencies of ME utilization for maintenance and weight gain estimated were .61 and .40, .62 and .37, .62 and .31, .61 and .30 and .53 and .11, respectively for diets with 2.70, 2.64, 2.40, 2.38 and 2.28 Mcal ME/kg DM.

(PDF emailed within 1 workday: $29.90)

Accession: 003123313

Download citation: RISBibTeXText



Related references

Efficiency of metabolizable energy utilization for weight gain and requirements of metabolizable energy, total digestible nutrients and metabolizable protein of Holstein bull calves. Revista Brasileira de Zootecnia 28(1): 214-221, 1999

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 maintenance, weight gain, metabolizable energy and total digestible nutrients requirements of Nelore bulls. Revista Brasileira de Zootecnia 31(1 Suppl.): 514-521, 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

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 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, March-April, 1999

Energy requirements for maintenance and net efficiency of metabolizable energy utilization for maintenance and weight gain of Moxoto kids. Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science 37(8): 1475-1482, 2008

Energy requirements for maintenance and net efficiency of metabolizable energy utilization for maintenance and weight gain of Moxoto kids. Revista Brasileira De Zootecnia: 8, 1475-1482, 2008

An evaluation of total digestible nutrients, metabolizable energy, and net energy for the prediction of energy requirements for beef cattle in Ontario. Canadian Journal of Animal Science 53(3): 471-477, 1973

BOARD-INVITED REVIEW: Efficiency of converting digestible energy to metabolizable energy and reevaluation of the California Net Energy System maintenance requirements and equations for predicting dietary net energy values for beef cattle. Journal of Animal Science 94(4): 1329-1341, 2016

Net energy metabolizable energy and total digestible nutrients applications in predicting average daily gain for ontario cattle. Canadian Journal of Animal Science 52(3): 584, 1972

Empty body weight gain, protein, faty and energy deposit and utilization of metabolizable energy for energy deposit in black and white bulls. 2. Relationship between energy deposit and intake of metabolizable energy. Archiv für Tierernahrung 48(3): 287-301, 1995

Investigations into empty body weight gain, protein, fat and energy deposition as well as into the utilization of metabolizable energy for energy deposition in Black and White bulls. 3. Relations between energy deposition and intake of metabolizable energy. Archives of Animal Nutrition 48(3): 287-301, 1995

Efficiency of utilization of metabolizable energy when rearing bull calves on rations with different energy-to-protein ratios. Soviet Agricultural Sciences (3): 40-43, 1987

Estimation of metabolizable energy requirements for maintenance and energetic efficiency of weight gain in Bos taurus and Bos indicus cows in tropical Mexico. Journal Of Animal And Veterinary Advances: 2, 421-428, 2010