Influence of tannin-rich pine bark supplementation in the grain mixes for meat goats:Growth performance,blood metabolites,and carcass characteristics

摘要

The objective was to evaluate the use of condensed tannin(CT)-rich ground pine bark(PB)in grain mixed diets on meat goat growth performance,blood metabolites,and carcass characteristics.Twenty four Kiko crossbred(Capra aegugrus hircus)growing male kids(BW=36.9±2,5 kg)at approximately 8 months of age were assigned randomly to 2 treatments with 3 replicates per treatment and 4 goats per replicate.The goats were fed grain mixed diets composed of either 30%bermudagrass hay(BGH)plus concentrate(control)or 30%PB plus concentrate.Diets were fed at 1.2%of BW.In addition,all goats grazed a crabgrass/bermudagrass(CB)-based pasture.The feeding trial lasted for 55 d.Using ground PB as a supplement did not negatively affect BW,average daily gain(ADG),carcass characteristics,meat pH,and meat color compared to the control diet.Plasma gamma-glutamyl transferase(P=0.03),glucose(P<0.01)and Ca concentrations(P=0.04)were higher for PB than for BGH,respectively.The 30%PB supplementation does not negatively affect animal performance,blood metabolites,and carcass parameters.