Muscle fibre types in rabbit offspring in relation to different maternal dietary lysine contents. Forty-three does was fed control (C; Lysine: 0.68%) and 43 does a lysine supplemented diet (L; Lysine: 0.80%) during pregnancy and lactation. At birth, half litters of C does were put under C does (CC group), the other half under L does (CL group). The same procedure was followed for offspring of L does (LC and LL groups). Ten CC and 10 LL rabbits were slaughtered at kindling, 10 rabbits of each group (CC, CL, LC and LL) were slaughtered at 17d of age, 10 CC and 10 LL rabbits were slaughtered at 81d of age. The L. dorsi muscles were removed after death and fibre type percentage (αW, αR, βR) and morphometric traits were determined. At kindling age, the sphericity was higher in LL than in CC rabbits (P<0.01). Higher dietary lysine during lactation reduced the size and the percentage of β fibres in 17-days pups (P<0.10). At commercial slaughter age the LL rabbits showed lower percentage of βR fibres (P<0.05) than CC rabbits.
Etude morphométrique et histochimique des fibres musculaires des lapereaux issus de mères nourries avec un aliment supplémenté en lysine
DALLE ZOTTE, ANTONELLA;
2005
Abstract
Muscle fibre types in rabbit offspring in relation to different maternal dietary lysine contents. Forty-three does was fed control (C; Lysine: 0.68%) and 43 does a lysine supplemented diet (L; Lysine: 0.80%) during pregnancy and lactation. At birth, half litters of C does were put under C does (CC group), the other half under L does (CL group). The same procedure was followed for offspring of L does (LC and LL groups). Ten CC and 10 LL rabbits were slaughtered at kindling, 10 rabbits of each group (CC, CL, LC and LL) were slaughtered at 17d of age, 10 CC and 10 LL rabbits were slaughtered at 81d of age. The L. dorsi muscles were removed after death and fibre type percentage (αW, αR, βR) and morphometric traits were determined. At kindling age, the sphericity was higher in LL than in CC rabbits (P<0.01). Higher dietary lysine during lactation reduced the size and the percentage of β fibres in 17-days pups (P<0.10). At commercial slaughter age the LL rabbits showed lower percentage of βR fibres (P<0.05) than CC rabbits.Pubblicazioni consigliate
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