Desempenho e viabilidade econômica de tourinhos de diferentes grupos genéticos, suplementados no pasto com fonte mineral ou energético-mineral, com posterior terminação em confinamento
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2017-12-01
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Universidade Federal de Goiás
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The aim of this study was to evaluate the performance and economic viability of young bulls
backgrounded in rotated pasture of Cynodon spp. cv. Tifton 85, in the rainy season. Eightyone
bull calves with average age of 12 months and average weight of 252±33 kg were used.
The experiment was conducted in a completely randomized design in a 2x3 factorial
arrangement, using mineral supplement (MS) and energy-mineral supplement (EMS), and
three genetic groups Nellore (NEL), ½Canchim½Nellore (CAN) and ½Brangus½Nellore
(BRN). The average forage availability was 13.6 kg DM/day per animal. The consumption of
MS was statistically similar between genetic groups with overall mean of 0.073 kg/day per
animal. The consumption of EMS was higher for the BRN with 2.10 kg/day, followed by
CAN with 1.57 kg/day and lower for NEL with 1.28 kg/day. Average daily weight gain
(ADG) and total weight gain were higher for animals receiving EMS than those receiving MS
(P<0.05). In the MS treated animals, the BRN had ADG of 0.64 kg, and the NEL and CAN
were similar with average of 0.46 kg/day. For animals that consumed EMS, the CAN had
higher ADG with 0.97 kg, and the NEL and BRN were similar with average of 0.86 kg/day.
Levels of glucose, cholesterol, total protein, albumin and creatinine were not changed by the
type of supplement or genetic groups. Higher levels of urea were found in NEL and CAN
animals with MS. The BRN were more compact, with greater development of chest and
hindquarters, the CAN had intermediate development of thorax and hindquarters, and
presented greater growth in length, while the NEL had higher growth in height and lower in
thorax and hindquarters. The highest spending on MS per animal/day was for the NEL
(R$0.14), the lowest for the BRN (R$0.06), and intermediate for the CAN (R$0.07). For
animals treated with EMS the highest spending per animal/day was for the BRN (R$1.95), the
lowest for the NEL (R$1.14), and intermediate for the CAN (R$1.40). The cost of EMS was
higher in all genetic groups in relation to MS. The net income per animal with MS was better
for the BRN with R$282.04, followed by the CAN with R$197.18, and lower for the NEL
with R$117.21. For bulls that received EMS, the CAN had the best net revenue of R$317.40
per animal, followed by BRN with R$175.55 and lower for NEL with R$165.30. The NEL
and CAN bulls that received EMS had a higher economic return than those treated with MS,
whereas BRN had a better return for animals treated with MS. The energy-mineral
supplement provided better performance of animals. The use of energy-mineral supplement
during the rainy season in Tifton 85 grass is recommended only for Nellore and
½Canchim½Nelore bulls, for ½Brangus½Nelore the mineral supplement is recommended.
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GUIMARÃES, Tiago Pereira. Desempenho e viabilidade econômica de tourinhos de diferentes grupos genéticos, suplementados no pasto com fonte mineral ou energético-mineral, com posterior terminação em confinamento. 2017. 93 f. Tese (Doutorado em Zootecnia) - Universidade Federal de Goiás, Goiânia, 2017.