Terminação de vacas e novilhas com diferentes períodos de confinamento
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Data
2020-12-08
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Universidade Federal de Goiás
Resumo
The performance, carcass and meat characteristics and economic viability of Nellore cows and
heifers feedlot finished during 40 or 60 days were evaluated. The experimental design used was
completely randomized with treatments in a 2 x 2 factorial arrangement, with two female
categories and two confinement periods. Twenty-two cows with 74.3 months and 22 heifers
with 20.4 months were used. The experimental diet included corn silage and concentrate
containing 18% CP and 74% NDT. In the 21-days adaptation period, cows showed much lower
performance. The food consumption expressed as a percentage of body weight was higher in
heifers, with average daily weight gain of 821 and 938 g, while cows practically maintained
their weight with average daily weight gain of 62 and -291 g. Heifers were more efficient in
feed conversion during adaptation. After the adaptation period, cows showed greater average
daily weight gain, with similar feed conversion to heifers. The cold carcass yield was higher
(p<0.04) in heifers, which also showed greater subcutaneous fat thickness (P<0.01) with the
40-day finishing, but with no difference to the 60-day finishing. The increase in the feedlot
period provided a higher marbling content (P<0.01) in the Longissimus lumborum muscle in
both categories, the increase being more evident in cows. The net profit from finishing the
heifers was 47.2% higher (P<0.5) in relation to the profit obtained with the cows.
Descrição
Palavras-chave
Confinamento , Adaptação , Terminação , Vacas , Feedlot , Adaptation , Finishing , Heifes , Cows , Novilhas
Citação
BRANDÃO, B. M. Terminação de vacas e novilhas com diferentes períodos de confinamento. 2020. 27 f. Dissertação (Mestrado em Zootecnia) - Universidade Federal de Goiás, Goiânia, 2020.