NON-CARCASS COMPONENTS OF NELLORE BOVINES SLAUGHTERED WITH DIFFERENT WEIGHTS

AbstractThe objective of the experiment was to evaluate byproducts yield of non-castrated Nellore males slaughtered at different weights. Forty Nellore males with average weight of 350 kg at the beginning of the feedlot were used. In a completely randomized design, the animals were divided into four groups: 0 to 2-teeth animals with carcass weight up to 238.0 kg (young and light carcasses); 2-teeth animal with carcass weights ranging from 238.1 to 258.0 kg (young and middle weight carcasses); 2-teeth animal with carcass weight over 258.0 kg (young and heavy carcasses) and animals with four or six teeth, regardless of carcass weight (adults). Animals were fed during 84 days with diet calculated to reach average weight gain of 1.2 kg/day. Hide weight was higher for young and heavy animals in relation to young and light and adult animals. Regarding the non-carcass components yield, we verified difference for liver percentage, which was higher for young and heavy animals (1.91%) in relation to young with middle weight carcasses (1.49%). Economic analysis showed that the non-carcass components of young animals with heavy carcass result in higher income (R$ 208.00), followed by young animals with middle weight carcasses (R$ 193.56), and the incomes of adult and of young and light animals, respectively, R$ 21.42 and R$ 23.42 lower than the first one. No carcass components add to industry from R$ 0.71 to R$ 0.80 per carcass kilogram.

摘要：本试验旨在评估不同屠宰体重的未去势内洛尔公牛（Nellore）的副产品产出率。试验选用40头育肥期初平均体重为350 kg的内洛尔公牛。采用完全随机试验设计，将试验动物分为4组：①0~2齿且胴体重不超过238.0 kg组（青年轻胴体组）；②2齿且胴体重介于238.1~258.0 kg组（青年中胴体组）；③2齿且胴体重超过258.0 kg组（青年重胴体组）；④4或6齿（无论胴体重）组（成年组）。试验动物经84天育肥，日粮配方设计目标为日均增重1.2 kg。青年重胴体组的皮重显著高于青年轻胴体组与成年组。在非胴体组分产出率方面，各组肝脏占比存在显著差异：青年重胴体组的肝脏占比（1.91%）显著高于青年中胴体组（1.49%）。经济分析结果显示，青年重胴体组的非胴体组分可实现更高收益（208.00巴西雷亚尔），其次为青年中胴体组（193.56巴西雷亚尔）；成年组与青年轻胴体组的收益分别较青年重胴体组低21.42巴西雷亚尔与23.42巴西雷亚尔。每千克胴体可为行业带来0.71~0.80巴西雷亚尔的附加收益。