Two experiments were carried out during one year to evaluate growth metabolic profiles and carcass characteristics of Italian local strains of Muscovy duck males (MD) and Common duck females (CD) fed with diets containing sorghum. In the first trial the ducks were fed ad libitum, from day old to slaughtering age, three experimental isoenergetic and isoproteic diets, let A (corn based diet), diet B (half corn and half high tannin sorghum - HTS), diet C (HTS - based diet). In the second trial ducks were fed ad libitum, from day old to slaughtering age, three experimental isoenergetic diets, diet A1 (corn based diet), diet B1 (low tannin sorghum - LTS plus, 1.5 g/Kg, starter, or 2.5 g/Kg, finisher, of dl-metionine) diet C1 (50% low tannin sorghum - LTS with 50% HTS plus, 1.5 g/Kg, starter, or 1.5 g/Kg, finisher, of dl-metionine). Individual live weights and feed consumption were recorded weekly per pen, plasma samples were drawn at slaughter age, carried out at 11 weeks for MD and 8 weeks old for CD. In the first trial live weights of MD and CD fed with diet C were lower than live weights of birds fed with the other two diets (MD: 2053g vs. 3537g and 3000g; CD: 1520g vs. 1805g and 1738g; P < .01). Presence of tannin reduced food intake and depressed metabolism, particularly in MD, affected the productive efficiency and the slaughtering traits. In the second trial productive performances of MD and CD fed C1 did not show the lack of growth but CD showed higher plasma glucose levels in the diet containing sorghum, probably also for the metionine addition. Higher traits of RCC were observed in MD fed with diet A1 and C1 than in birds fed with diet B1. Higher incidence of the breast muscles were observed in MD fed diet A1 than group fed diet C1.
|Autori:||Bagliacca M; Paci G; Marzoni M; Biagi G; Avanzi CF|
|Titolo:||Effect of sorghum in diets for ducks|
|Anno del prodotto:||1997|
|Appare nelle tipologie:||1.1 Articolo in rivista|