SciELO - Scientific Electronic Library Online

 
vol.35 issue4Glycerin levels in the diets for crossbred bulls finished in feed-lot: ingestive behavior, feeding and rumination efficiencyBee pollen supplementation in diets for rabbit does and growing rabbits author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Acta Scientiarum. Animal Sciences

On-line version ISSN 1807-8672

Abstract

VALENTE, Eriton Egidio Lisboa et al. Requirement of energy and protein of beef cattle on tropical pasture. Acta Sci., Anim. Sci. [online]. 2013, vol.35, n.4, pp.417-424. ISSN 1807-8672.  https://doi.org/10.4025/actascianimsci.v35i4.21143.

Protein and energy requirements of beef cattle, aged between 4 and 18 months old, on tropical pastures, were estimated. Forty-six Nellore calves (138.3 ± 3.4 kg BW and 90-150 days old), kept on pasture, were distributed in a maintenance group (restricted feeding) or in nutritional plans, receiving a supplements with different amounts of protein and carbohydrate or non-supplemented. The net energy requirement for weight gain (NEg) was obtained by linear regression of logarithm of retained energy as a function of logarithm of empty body weight gain. The net energy requirement for maintenance (NEm) was estimated by the exponential relation between heat production and metabolizable energy intake. Net protein requirement for weight gain (RP) was estimated by multiple linear regression of retained protein in the weight gain of empty body (EBWG) and retained energy. The efficiency of metabolizable energy (ME) used for maintenance and for weight gain was 0.55 and 0.26, respectively. The ME requirement for maintenance was 124 kcal EBW-0.75. RP decreased in proportion to body weight increase. NEg and RP may be obtained by equations: RE (Mcal kg-1) = 0.044 x EBW0.75 x EBWG1.1302 and RP (g day-1) = -31.45 + 229.69 x EBWG - 8.75 x RE, respectively.

Keywords : grazing; Nellore; supplementation.

        · abstract in Portuguese     · text in English     · English ( pdf )

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License