DETERMINATION OF THE FEEDING VALUE OF FOOD INDUSTRY BY-PRODUCTS

Tatiana Dumitra Panaite, Rodica Diana Criste, Mariana Ropota, V. Criste, Gabriela Vasile, Margareta Olteanu, Monica Mitoi, Raluca Socoliuc, Al. Vlaicu

Abstract
    The use of plant by-products from the food industry in animal feeding is a way of reusing resources with a high feeding potential. With the view of their potential use in poultry diets, 5 by-products (rapeseeds meal, grape seeds meal, flax meal, buckthorn meal and pumpkin meal) were characterized chemically and physically to determine their feeding value. The chemical determinations revealed a variable content of protein, ranging between 11.91% (grape seeds meal) and 34.88% (pumpkin meal). The rape seeds meal has 33.15% protein, with high concentrations of limiting amino acids (1.85% lysine, 0.71% cystine and 0.71% methionine), compared to the grape seeds meal (0.42% lysine) or the buckthorn meal (0.16% cystine; 0,17% methionine). The flax meal has a high concentration of α linolenic acid (42.93 g/100 g total fatty acids), and the grape seeds meal has a high antioxidant capacity (493.074 mMTrolox/g). The grape seeds meal has a high concentration of Fe (362 mg/kg), while the rapeseed meal has a high concentration of manganese (82.9 mg/kg), selenium (1.2 mg/kg) and zinc (95 mg/kg). The pumpkin meal has high concentrations (mg/kg) of Co (0.78), Cu (19.2), Ni (447) and Mo (116). The gross energy level (MJ/kg) was 16.94 (rapeseeds meal); 18.07 (grape seeds meal); 18.94 (buckthorn meal); 19.31 (flax meal); 20.10 (pumpkin meal). These results show that the analysed by-products meet the feeding requirements to be used as feed ingredients in layer diets.

Key words: meals, rapeseed, grape seeds, flax, pumpkin, buckthorn, chemical composition

STABILIREA VALORII NUTRITIVE A UNOR SUBPRODUSE DIN INDUSTRIA ALIMENTARĂ

Tatiana Dumitra Panaite, Rodica Diana Criste, Mariana Ropota, V. Criste, Gabriela Vasile, Margareta Olteanu, Monica Mitoi, Raluca Socoliuc, Al. Vlaicu

Rezumat
    Valorificarea subproduselor vegetale, din industria alimentară, în hrana animalelor de fermă este o modalitate de refolosire a unor resurse cu potenţial nutritiv ridicat. In scopul includerii în raţiile găinilor ouătoare, au fost caracterizate fizico-chimic 5 subproduse (sroturi de rapiţă, sîmburi struguri, catina, dovleac şi in) în vederea stabilirii valorii lor nutritive. Determinările chimice au relevat un conţinut variabil de proteină cuprins între 11,91% (srot sâmburi struguri) şi 34,88% (srot dovleac). Srotul de rapiţă are 33,15% proteină cu concentraţii mari de aminoacizi limitanţi (1,85% lizina; 0,71% cistina; 0,72% metionina) comparativ cu şrotul samburi de struguri (0,42% lizina) sau srotul de catina (0,16% cistina; 0,17% metionina). Srotul de in se caracterizează printr-un conţinut ridicat de acid α linolenic (42,93 g/100g total acizi graşi) iar srotul din sâmburi struguri are capacitate antioxidantă mare (493.074 mMTrolox/g). Srotul din seminţe de struguri are un conţinut ridicat de Fe (362 mg/kg) iar srotul de rapita de mangan (82,9 mg/kg), seleniu (1,2 mg/kg) si zinc (95 mg/kg). Srotul de dovleac are concentratii (mg/kg) mari de Co (0,78), Cu (19,2), Ni (447) si Mo (116). Valoarea energiei brute (MJ/kg) a fost de: 16,94 (srot rapita); 18,07 (srot samburi struguri); 18,94 (srot catina); 19,31 (srot in); 20.10 (srot dovleac). Dupa finalizarea determinarilor fizico-chimice s-a constatat că aceste subproduse indeplinesc cerinţele nutriţionale pentru utilizarea ca materii prime furajere în hrana găinilor ouătoare.

Cuvinte cheie: sroturi, rapita, struguri, in, dovleac, catina, compoziţie chimică, microbiologie