Desempenho na fase de recria e características da carcaça de bovinos de origem leiteira submetidos a diferentes estratégias de alimentação
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2010-02-18
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Universidade Federal de Goiás
Resumo
In order to evaluate the performance in the growing phase on pasture and the quantitative and qualitative characteristics of carcass and meat from 24 of crossbred dairy steers under different nutritional strategies, the experiment was conducted in two phases. In the first phase (growing) the steers were maintained on Brachiaria brizantha pasture, from 6 to 11 months of age under two levels of supplementation (high and medium) corresponding to the supply at a rate of 1.0 and 0.5 % of live weight in the experimental group, respectively. This phase we evaluated the effects of nutrient levels on the performance and development of body measurements and their correlation with weight gain. Animals of the high level of supplementation (TA) had the highest ADG and more consistent with the evolution of the periods (0.95, 1.09, 1.07, 1.00, 0.93 and 0.23 kg / days), with only the middle of the sixth period shorter (p <0.05) than the other, resulting in greater (p <0.05) final weight (231.26 vs. 197.55 kg),
while the animals treatment of medium level of supplementation (TM) had higher ADG oscillations between periods (0.83, 0.59, 0.75, 0.78, 0.44 and 0.35 kg / day), with statistical difference (p <0.05) between all periods, except
between the first and fourth. The TA group had higher (p <0.05) results for the variables girth (and final Gain), length (final and gain), hip height (final and gain), withers height (final) scrotal (final) and did not differ (P> 0.05) for gain in
scrotal circumference and cinnamon. The gain in heart girth was positively correlated with weight gain in average daily total with coefficients of 0.77 and 0.70 for TM and TA, respectively. Later in the second phase of the experiment,
from 11 to 15 months of age, the animals were maintained in the feedlot with the energy level high or medium corresponding to the inclusion of 50 or 80% concentrate on DM of the total diet, respectively. The hot carcass yield was
significantly higher for the high level of concentrate in the finishing (50.16 vs. 48.62%). The average level of supplementation during the growing phase resulted in a greater percentage of carcass fat in relation to the high (25.61 vs. 23.39%). The percentage of fore and rear were not affected. However, the percentage of needle point was higher in animals with high level of supplementation in the growing and who subsequently received the average level of concentrate in the termination, as compared to animals receiving nutrition level in both phases (13,41 vs 12.22%). The high level of supplementation in the growing gave rise to longer carcass (134.48 vs 131.43 cm), more tender meat (4.72 vs. 6.66 Kg/cm3) and beef and red color lighter
(3.88 vs. 2.89 points). The area of rib eye, fat thickness, marbling score and conformation were not influenced by nutrient levels with average values of 51.46 cm2, 2.9 mm, 5.93 points, 10.33 points, respectively.
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REZENDE, Pedro Leonardo de Paula. Performance in growing phase and meat and carcass s characteristics from crossbreed dairy origin steers
submitted to different feed strategies. 2010. 85 f. Dissertação (Mestrado em Ciências Agrárias - Veterinaria) - Universidade Federal de Goiás, Goiânia, 2010.