Performance of crossbred heifers in different step-down waste milk-feeding strategies
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Universidade Federal de Minas Gerais
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The aim of this study was to evaluate the consumption, performance, feed efficiency, glucose concentration, and
the cost per kilogram of weight gain of crossbred HolsteinGyr heifers (n = 33) subjected to one of the three waste milk
step-down strategies: 6L-30d/4L-60d/2L-90d (T1), 6L-45d/
4L-60d/2L-90d (T2), and 8L-30d/6L-60d/3L-90d (T3).
Heifers were weaned at the age of 91 days. Water and starter
were provided ad libitum. The average waste milk intake was
higher in T3 than in T1 and T2 strategies until 30 days and
between 60 and 90 days. The starter intake did not differ
among the strategies until 45 days, but it was higher in strategy
T1 than in strategy T3 between 60 and 90 days. The waste
milk step-down strategy did not influence the total dry matter
intake, average daily gain, body weight, and feed efficiency.
Glucose concentrations in plasma varied within a range that
could be considered normal and were similar among the treatments. The average cost per kilogram of weight gain was the
lowest in strategy T1 (US$3.0) compared to that in the other
strategies (T2, US$3.2, and T3, US$3.6). The 6L-30d/4L-60d/
2L-90d waste milk step-down strategy was the most effective,
since it increased the starter intake, led to normal glucose
concentrations in plasma, and caused similar weight gain
compared with the other strategies; however, it had a lower
cost per kilogram.
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https://link.springer.com/article/10.1007/s11250-016-1134-2