Abstract
ABSTRACT Forty eight crossbred calves, 24 males and 24 females, with weight and age of 203.6±3.7kg and 11.8±1.0 months were allotted to the following treatments: MT- mineral salt ad libitum and sugar cane mixed with 10g kg-1 mixture of urea and ammonium sulfate in a 9:1 proportion; MA - sugar cane mixed with 16g kg-1 of a concentrate of urea (550g kg-1), ammonium sulfate (60g kg-1) and minerals (390g kg-1); SU - sugar cane mixed with 50g kg-1 of a concentrate of soybean meal (830g kg-1), urea (52g kg-1) and minerals (118g kg-1) and MC - corn silage mixed with 10g kg-1 of a concentrate of urea (500g kg-1), ammonium sulfate (50g kg-1) and minerals (450g kg-1). Minerals mixed with sugar cane (MA) resulted in greater weight gain (0.258 x 0.188kg d-1) for similar intakes of DM (3.29 x 3.30kg d-1). Substitution of part of urea nitrogen in the MA by soybean meal (SU) resulted in greater ADG (0.538 x 0.258kg d-1), due to higher sugar cane intake (4.10 x 3.13kg d-1). ADG of calves receiving corn silage was greater (0.406 x 0.258kg d-1) than for calves receiving sugar cane.
Highlights
The production of sugar cane in Brazil in 2016 was 694.54 million tons
Supplementation with minerals, which are deficient in sugar cane in relation to calf requirements, mixed with forage (MA) instead of being offered ad libitum in trough (MT) resulted in greater ADG (0.258 x 0.188kg/calf)
Crossbred calves (3⁄4 Zebu x Holstein) that received mineral salt supplementation mixed with sugar cane nitromineral concentrate showed greater weight gain and feed efficiency than those supplemented ad libitum in the trough
Summary
The production of sugar cane in Brazil in 2016 was 694.54 million tons. Of that amount it was estimated that about 10% was used for forage. The greater average weight gain of calves that received the minerals along with the urea and ammonium sulfate (MA) may have been the result of better efficiency in the utilization of the nutrients because no effect on dry matter intake was observed (3.29 x 3.30kg).
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