Productive response of fattening lambs to the supplementation with extract tannins

Abstract

To determine the effect of supplementation tannin extract level (TE) on feedlot performance finishing hair lamb, was realized one experiment with a randomized complete block design, in that were used 48 hair lamb (3/4 Katahdin x 1/4 Pelibuey) with average 70 ± (standard deviation) 5 d old SD and an body weight of 21.3 ± 3.23 kg SD during a period of 70 day. The treatments were: 1) diet formulated with corn grain, soybean meal and corn straw, with nutritional support according physiology requirement, without addition of TE (Control; n = 12); 2) control diet plus supplementation with 0.15 % of TE (TE 15; n = 12); 3) control diet plus 0.3% of TE (TE 30; n = 12); and 4) control diet plus 0.45 % of TE (TE 45; n = 12). Results were analyzed by ANOVA (P ≤ 0.05), and the influence of TE level on productive response was explored using polynomial contrasts. Average daily gain (ADG) and feed conversion (feed/gain ratio) was improved (P ≤ 0.05) with the diet supplemented with 0.15 and 0.30% of TE, and body weight last was higher (P = 0.05) in the lamb feeding with supplemented diets 0.15% TE. Quadratic response was observed (P ≤ 0.05) to the TE supplementation level; the regression analyses suggest that better productive response may be found with TE 0.2% supplementation level (R2 = 0.75; P < 0.01). It is concluded, that intake of supplemented diets with TE improved ADG and feed conversion, and the better performance it is obtained with 0.2 % of TE in the diet.