With the increasing use of antibiotics as growth promoters and even for therapeutical purposes on breeding of food-producing animals, there is the worldwide interest related to the ingestion of antibiotical residues on food and their effects on human health. The ingestion of food containing antibodies residues can cause bacterial resistence to the antibodies usually used on human therapies, what difficult the treatment of human infectious illnesses. Antibiotic sensitivity test was realized on Listeria spp. Strains, which were isolated from bovine meat samples, according to the National Committee for Clinical Laboratory Standards (NCCLS), 2003. According to the finding results, all isolated strains showed resistance to gentamicine, cefoxitine, ampicyline, clindamicine, oxacycline and sulfazotrim. L. innocua isolated strains showed resistance to gentamicine, cefoxitine, tetracycline, vancomicine, oxacycline and clindamicine. | Com o aumento do uso de antimicrobianos como promotores de crescimento e até mesmo com fins terapêuticos na criação de animais de produção, existe o interesse global referente ao consumo de baixos níveis de resíduos de antimicrobianos em alimentos e os efeitos destes na saúde humana. A ingestão de alimentos contendo resíduos de fármacos antimicrobianos pode ocasionar resistência bacteriana aos antimicrobianos utilizados rotineiramente na terapêutica humana, dificultando o tratamento de enfermidades infecciosas humanas. Neste experimento foi realizado o teste de sensibilidade aos antimicrobianos em cepas de Listeria spp. isoladas a partir de amostras de carnes bovinas, através da metodologia descrita pelo NCCLS em 2003. De acordo com os resultados, todas as cepas isoladas foram resistentes à maioria dos antimicrobianos testados. As cepas de L. monocytogenes foram resistentes à gentamicina, cefoxitina, ampicilina, clindamicina, oxaciclina e sulfazotrim. As cepas de L. innocua isoladas foram resitentes à gentamicina, cefoxitina, tetraciclina, vancomicina, oxaciclina e clindamicina.

Caprines were used in a change-over design to evaluate dry matter (DM) and crude protein (CP) degradability of the following byproducts: soybean meal 1 (SM1), heat-processed soybean (HPS), cotton seed meal (CSM), meat and bone meal 1 (MBM1), meat and bone meal 2 (MBM 2), soybean meal 2 (SM2), fish meal (FM), babasu meal (BM), blood meal (BLM) and chicken viscera meal (CVM) through in situ nylon bag technique. Napier grass (Pennisetum purpureum Schum) was fed as the only roughage. Effective degradability of CP was 68.47% (SM1), 65.60% (SM2), 60.71% (CSM), 65.69% (HPM), 61.59% (MBM1) and 62.58% (MBM2), while effective degradability of DM was 75.48% (SM1), 73.05% (SM2), 52.39% (CSM), 70.38% (HPM), 44.45% (MBM1), 47.01% (MBM2), 48.43% (FM), 38% (BM), and 53.82% (CVM), considering 0.05/h turnover (r). | Caprinos foram utilizados num delineamento change-over 2 (5 x 5) para estudar a degradabilidade da matéria seca e proteína bruta dos subprodutos: farelo de soja¹ (FS1), soja integral tostada (SIT), farelo de algodão (FA), farinha de carne e ossos 1 (FCO1), farinha de carne e ossos 2 (FCO 2), farelo de soja 2 (FS2), farinha de peixe (FP), torta de babaçu (TB), farinha de sangue (FSA) e farinha de vísceras de frango (FVF), pela técnica dos sacos de náilon in situ. O capim napier foi o único volumoso. A degradabilidade efetiva da PB foi de 68,47% para o FS1; 65,60% para o FS2; 60,71% para o FA; 65,69% para a SIT; 61,59% para a FCO1; e 62,58% para a FCO2, enquanto a degradabilidade efetiva da MS foi 75,48% para o FS1; 73,05% para o FS2; 52,39% para o FA; 70,38% para a SIT; 44,45% para a FCO1; 47,01% para a FCO2; 48,43% para a FP; 38% para a TB; e 53,82% para FVF, com r de 0,05/h.

In the conditions of the Republic of Belarus there were analyzed high productive traits of meaty calves and cross breeds bred in accordance with a system cow-calf, as well as the possibilities of using veal meat obtained in ecologically safe areas for infant food production. At the age of 6,5-7 months the weight of fresh carcass of bull-calves of sharolez breed in comparison with aberdin-angus х black-motley herdmates was on 41,6 kg (Р less than 0,001) higher, carcass yield and slaughter yield – on 13,8% (Р less than 0,001) and 13,6% (Р less than 0,001), respectively. The fat content in sharolez meat was 4,9% against 8,9%; protein - 21,9% against 18,8%. The black-motley suckling bull-calves surpassed their herdmates which were grown up by technology of dairy cattle breeding at the age of 6-6,5 months according to indexes of weight of fresh carcass - on 16,3 kg or 21,7% (Р less than 0,01); according to indexes in a slaughter yield - on 16,6% (Р less than 0,001); and according to indexes meat flesh in a carcass - on 1,5%. According to quality indexes, amino acid structure, acceptable concentration of toxic elements content, pesticides, antibiotics, radionuclides and other harmful substances the veal meat of calves which were bred on a system a cow-calve in ecologically pure zones proved to be important meat raw materials to produce infant food products.