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atti delle giornate di coniglicoltura asic 2011 - Fondazione iniziative ...

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Lavori scientifici - sessione Nutrizione e Fisiologia<br />

INFLUENZA dELLA SOmmINISTRAZIONE dI dIETE<br />

IpOpROTEIchE IN cONIgLI IN AccREScImENTO<br />

masoero G., ChiCCo r., soLomiTa m.<br />

CRA-PCM, Torino, Italy<br />

Giorgio Masoero, CRA-PCM, Via Pianezza 115, 10151 Torino, Italy - Tel. +39 347 5463061<br />

*Correspon<strong>di</strong>ng author: giorgio_masoero@alice.it<br />

AbSTRAcT<br />

Effects of low protein <strong>di</strong>ets fed to growing rabbits in varied housing and water<br />

con<strong>di</strong>tions<br />

a factorial 2×2×2 design was used to study the effects of nitrogen levels of the <strong>di</strong>ets<br />

(P = normal protein level vs. L = Low-protein with 4 amino-acids integration),<br />

housing system (i = in<strong>di</strong>vidual cages vs. G = Group by 7 rabbits) and water regimens<br />

(L = ad libitum 24/24 vs. r = restricted 20/24 h) on a total of 92 growing rabbits<br />

raised from 45 to 73 d. Twenty-four animals pre-selected by live nir spectroscopy<br />

were slaughtered and controlled in carcass by nirs. Low protein <strong>di</strong>et <strong>di</strong>d not improved<br />

protein utilisation with equality in all other traits. Group raising strongly reduced<br />

growth (-15%), feed intake (-6%), feed conversion efficiency (iC+15%), skin<br />

% (-7%), liver % (-18%) with greater incidence of slaughter (+14%) and chilling<br />

losses (+37%) and kidneys (+7%), and with strong <strong>di</strong>fferentiation of nirs spectra in<br />

carcass (avg. r2 0.54) but not in live. The water restriction reduced the intake of feed<br />

(-5%), increased the meat aci<strong>di</strong>fication (ph:-2%), strongly increased a<strong>di</strong>posity in renal<br />

(+110%) and scapular sites (+121%) with evident effects in live nir scans of ear<br />

and loin (0.76) and average on the carcass (0.45).<br />

Key Words: Aminoacids, Housing, Water restriction, Rabbit.<br />

INTROdUZIONE<br />

il razionamento alimentare dei giovani è consigliato negli allevamenti come agente<br />

mitigatore <strong>di</strong> mortalità (Foubert et al., 2008). Tuttavia il metodo è meno efficace,<br />

anzi controproducente secondo bovera et al. (2008). autori francesi (Verdelhan<br />

et al., 2004) hanno introdotto la restrizione idrica, anche severa (accesso<br />

1,5; 3; 4h/24h) come agente in<strong>di</strong>retto <strong>di</strong> razionamento alimentare (consumi:<br />

-22; -17; -9%) evidenziando una sostanziale contrazione dell’abbeverata e quin<strong>di</strong> dei<br />

liquami (-38; -28; -13%). una riduzione dell’acqua <strong>di</strong> bevanda, e del correlato consumo<br />

solido, può interferire con un sod<strong>di</strong>sfacimento aminoaci<strong>di</strong>co ottimale, per il quale<br />

si richiederebbe dunque una maggiore concentrazione. obiettivo della presente prova<br />

99

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