<b>Requirement of energy and protein of beef cattle on tropical pasture</b> - doi: 10.4025/actascianimsci.v35i4.21143
Resumo
Protein and energy requirements of beef cattle, aged between 4 and 18 months old, on tropicalpastures, 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.
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