Efeito do tanino no desempenho e características de carcaça de bovinos não castrados terminados em confinamento
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2019-03-07
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Universidade Federal de Goiás
Resumo
In order to increase the efficiency of the use of the nutrients supplied to the animals,
the use of additives becomes an option because it directly interferes with the ruminal
fermentation and consequently can improve the performance of the animals.
Antibiotics are the most commonly used additives in feedlots, but over the years the
use of antibiotic alternatives has been increasing due to the restriction of some
markets to the use of antibiotics in animal production. In this sense, the use of
tannins in the nutrition of beef cattle has been gaining strength as an alternative to
antibiotics. The objective of this study was to evaluate the performance and carcass
traits of steers in the finishing phase, receiving diets with the addition of a
commercial product based on tannins or Monensina. A total of 160 Nelore (64) and
Angus (96) with mean age of 20 months and initial weight of 342 ± 25 kg were used.
The experimental design used was a randomized complete block, being considered as
weights and breeds blocks, the experimental unit considered was the pen composed
by 8 animals and 5 replicates per treatment, totaling 20 experimental units. The
treatments evaluated were: M14 - Diet with 14% of CP and 25 ppm of Monensin;
MT14 - Diet with 14% of CP, 25 ppm of Monensin and 0.15%/DM of Tannins; T14 -
Diet with 14% of CP and 0.15%/DM of Tannins; MT13 - Diet with 13% of CP, 25 ppmof Monensin and 0.15%/DM of Tannins. The treatments provided the same diet for all
animals (90 and 10%, for concentrate and forage, respectively). The experimental
period was 105 days with 14 days of adaptation. The treatments MT14 and T14
presented values higher than the others for final weight (P = 0.002), dry matter
intake (P <0.001), intake per live weight percentage (P <0.001), total mean gain (P
= 0.005) and average daily gain (P = 0.005). Food efficiency (P = 0.157) was similar
among all treatments. The parameters of ribeye area (P = 0.332), subcutaneous fat
thickness (0.848), gluteus medius fat thickness (P = 0.830) and gluteus medius area
(P = 0.141) obtained by ultrasonography showed no difference between the
treatments. The final carcass weight (P = 0.075) and carcass ADG (P = 0.076) were
higher for the MT14 and T14 treatments compared to the others. Carcass yield did
not differ between treatments (P = 0.904). The use of a mixture of condensed and
hydrolyzable tannins was shown to be viable in the finishing of beef cattle, presenting
feed efficiency and carcass characteristics similar to the monensin additive in diets
with 14% and 13% crude protein.
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NASCIMENTO, K. S. Efeito do tanino no desempenho e características de carcaça de bovinos não castrados terminados em confinamento. 2019. 42 f. Dissertação (Mestrado em Zootecnia) - Universidade Federal de Goiás, Goiânia, 2019.