IMPROVEMENT OF LAYING HEN PERFORMANCES BY DIETARY MANNANOLIGOSACCHARIDES SUPPLEMENTATION

Cristina Gabriela Radu-Rusu, I.M. Pop

Abstract
The goals of the study were to assess the effects of prebiotic mannanoligosaccharides feed additive on the performance and egg quality of commercial laying hens approaching the end of the laying period. The trial was setup at the Animal Husbandry Faculty's Experimental Farm in Iasi, Romania, during a 4 weeks period. The biological material consisted in 60 hens, 57 week old ISA Brown. The control group (30 hens) was fed with standard layer mixed feed, meaning a corn-soybean meal basal diet while the experimental treatment (30 hens) classic feed was supplemented with 0.1% prebiotic of mannanoligosaccharides kind (treatment A1). Several parameters were studied: hens living weight and feed intake dynamics, feed conversion ratio, laying intensity, egg mass production, eggs and eggshell weight, eggshell thickness, shell index, shell breaking strength, eggs with unconformities. The laying hens in the experimental group, whose fed was supplemented with prebiotic, gave higher performances, concerning the production parameters (laying intensity: +2.2%; egg mass production: +1.7%; feed conversion: -2.0%) and the shell quality (weight: +3.6%; thickness: +3.9%, breaking strength: +5.9%, eggs unconformities: -55.5%).

Key words: laying hens, mannanoligosaccharides, yield performances, egg quality

ÎMBUNATATIREA PERFORMANTEI GAINILOR OUATOARE PRIN SUPLIMENTAREA ALIMENTATIEI CU MANANOLIGOZAHARIDE

Cristina Gabriela Radu-Rusu, I.M. Pop

Rezumat
Obiectivele cercetarilor au fost de a evalua efectele utilizarii prebioticului de tip mananoligozaharid asupra productiei cantitative si calitative de oua, la gainile ouatoare aflate la sfârsitul perioadei de ouat. Experimentul s-a desfasurat în cadrul Biobazei Facultatii de Zootehnie Iasi, pe o perioada de 4 saptamâni. Materialul biologic folosit a fost reprezentat de 60 de gaini apartinând hibridului ouator ISA-Brown, în vârsta de 57 saptamâni. Lotul de control (30 gaini) a primit nutret combinat standard, de tip porumb-srot soia, în timp ce, în cazul lotului experimental (30 gaini) hrana a fost suplimentata cu 0,1 % prebiotic de tip mananoligozaharid (lotul A1). Parametrii studiati au fost: greutatea vie a pasarilor si evolutia consumului de hrana, conversia hranei, intensitatea de ouat, productia de masa ou, greutatea oualor si a cojii minerale, grosimea cochiliei, indicele cojii, rezistenta la spargere a cojii si proportia de oua cu defecte. Gainile ouatoare din lotul experimental, în hrana carora s-a adaugat prebiotic, au înregistrat performante superioare în privinta parametrilor productivi ai pasarilor (intensitatea de ouat: +2,2%; productia de masa ou: +1,7%; conversia hranei: -2,0%) si a calitatii cojii oualor (greutate: +3,6%, grosime: +3,9%, rezistenta la spargere: +5,9%, oua cu defecte: -55,5%).

Cuvinte cheie: gaini ouatoare, mananoligozaharide, performante productive, calitate ou