The growing period is very important in the life of the animal, since it may affect its productive and reproductive carreer. In this phase, many hormones are involved in regulating metabolism, namely GH, but also leptin could play an important role, considering its tissue of origin. In order to investigate leptin plasmatic levels and its correlations with GH and body weight, a research was carried out on 20 Sarda breed lambs. Blood samples were withdrawn fortnightly, from day 40° to day 210°, and the body weight of each animal was registered. Animals grazed during the day and in the night they were kept in the sheep pen where they received 300 g/head of concentrated feed containing 16% protein and 12.5% ME/kg of dry matter. Hay and water were ad libitum. Leptin and GH were analysed by RIA. The data were submitted to correlation and variance analysis. Leptin plasmatic levels displayed an increasing trend until 11th blood withdrawal, in correspondence with the end of the greatest body weight increase. GH blood levels showed a decreasing trend (P<0.01), while body weight values were increasing. Body weight was positively related to leptin and negatively to GH. The data point up that the low leptin values found at the beginning of the trial, might be involved in stimulating feed intake, and the high GH values promote molecular partition.
Carcangiu V., Vacca G.M., Parmeggiani A., Marogna G., Rapposelli E., Bini P.P. (2004). Variazioni dei livelli ematici di leptina, GH e del peso corporeo in agnelli di razza Sarda in accrescimento.. s.l : s.n.
Variazioni dei livelli ematici di leptina, GH e del peso corporeo in agnelli di razza Sarda in accrescimento.
PARMEGGIANI, ALBAMARIA;
2004
Abstract
The growing period is very important in the life of the animal, since it may affect its productive and reproductive carreer. In this phase, many hormones are involved in regulating metabolism, namely GH, but also leptin could play an important role, considering its tissue of origin. In order to investigate leptin plasmatic levels and its correlations with GH and body weight, a research was carried out on 20 Sarda breed lambs. Blood samples were withdrawn fortnightly, from day 40° to day 210°, and the body weight of each animal was registered. Animals grazed during the day and in the night they were kept in the sheep pen where they received 300 g/head of concentrated feed containing 16% protein and 12.5% ME/kg of dry matter. Hay and water were ad libitum. Leptin and GH were analysed by RIA. The data were submitted to correlation and variance analysis. Leptin plasmatic levels displayed an increasing trend until 11th blood withdrawal, in correspondence with the end of the greatest body weight increase. GH blood levels showed a decreasing trend (P<0.01), while body weight values were increasing. Body weight was positively related to leptin and negatively to GH. The data point up that the low leptin values found at the beginning of the trial, might be involved in stimulating feed intake, and the high GH values promote molecular partition.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
