Effects of dietary chromium supplementation on performance, liver and blood metabolites of kids
This study was carried out to determine the effects of supplementing chromium-methionine (Cr-Met) on fattening performance, liver and blood metabolites in Mahabadi goat kids. Thirty-two male kids (BW = 22 ± 2 kg, 4mo) were used in a completely randomized design to one of 4 treatments: control, 0.5, 1.0 and 1.5 mg Cr as Cr-Met/animal/d. The diet was formulated to meet the requirements recommended by NRC with 30 % forage (alfalfa and corn silage): 70 % concentrate ratio as TMR. The diets were the same, except for top-dress addition of Cr-Met fed in 2 equal meals (0700 and 1700 h) and orts were collected before morning meal. Animals were housed individually for 84 d. Animals were weighed in 21-d intervals. For measuring blood metabolites (glucose and cholesterol), blood samples were collected every 21 d before morning feeding. The end of trial following 16h fasting kids were slaughtered and some of the liver were immediately stored at −20C for assessing moisture, fat and crude protein content. Data considering dry matter intake(DMI), average daily gain (ADG) and blood metabolites were analyzed by Mixed Model procedure and liver metabolites with GLM MODEL procedure and adjust Tukey-Kramer (SAS 9.1). Intake (DMI), ADG, liver metabolites and blood plasma cholesterol were not significantly affected by dietary Cr-Met (P > 0.05). However supplementing diet with chromium significantly decreases plasma glucose relative to the control (P< 0.05). In conclusion, the results of this experiment indicated that dietary supplementation of Cr-Met failed to affect growth performance, plasma cholesterol and liver metabolites but decreased plasma glucose of Mahabadi goat kids.
Chromium-methionine, Blood metabolite, Mahabadi goat kid