| The experiment was conducted to study the effects of hop residues on growth performance in broilers. A total of 300 AA male broilers, 0 day age, were divided into six groups according to a completely randomized design, of which, 5 test groups for 4%, 8%,12%,16 and 12% of hop redidue respectively,one group for 0% of hop residue for control. Each group contained of five replicates with 10 broilers. The trial lasted 6 weeks(0-3weeks and 3-6weeks).The results were showed as follows:1,The dead and discarded rate of group 4% and 8% was higher than that of control group. The dead and discarded rate of group 12%,16% and 20% was lower than that of control group. The 6-week-aged weight of group 8%,12%,16% and 20% has decreased 16.7%(P<0.01),21.5%(P<0.01),25.1%(P<0.01)和37.9%(P<0.01)than control group. 8%,12%,16% and 20% hop residue decreased average daily weight gain and feed conversion rate of the broilers in each group with the increasing of hop residue in the diet during the total phase of 1st～42nd days. There were no significant differences at 4%(P>0.05).2,In this experiment,the live weight,dressed weight,dressing percentage, eviscerated weight with giblet, percentage of eviscerated with giblet, eviscerated weight, percentage of eviscerated yield, leg weight, brisket weight, leg muscle weight, leg muscle rate, brisket muscle weight, brisket muscle rate, abdomen fat weight, abdomen fat rate had no significant relevant with the level of hop residue(P>0.05).3,The ether extract of group 4% and 8% was significantly higher than that group of 20% (P<0.05).The leg muscle pH value of 24h after slaughter of 16% group was significantly lower than that of group 12% (P<0.05). The differences of dry matter,crude protein, drip loss percentage, missing water ratio, water holding capacity, the brisket muscle pH value of 1h and 24h after slaughter, the leg muscle pH value of 24h after slaughter, cooking loss, tenderness(shear force value)were not significant(P>0.05).4,The result of viscera growth showed that:there were not significant differences on the weight and Index of live, heart, spleen and gizzard among treatments(P>0.05).5,The result of Liver And Kidney Function showed that: the kidney superoxide dismutase (SOD) of group 4% was significantly lower than that of group 16%(P<0.05) and control group(P<0.05). the kidney catalase(CAT) of group 12% was significantly lower than that of group 16%(P<0.05).No differences were found on the liver superoxide dismutase(SOD), the glutathione peroxidase (GSH-Px), catalase(CAT), malondialdehyde(MDA), Total anti-oxidation capacity(T-AOC), glutamic pyruvic transaminase(GPT), glutamic oxaloacetic transaminase(GOT), lactate dehydrogenase(LDH), cholinesterase(CHE), aldolase(ALD) of liver and kidney among 6-week broilers fed with diets of different hop residue(P>0.05).6,The result of nutrient retemtion showed that: 8%,12%,16% and 20% hop residue decreased apparent energy and dry matter retention ratio of the broilers in each group with the increasing of hop residue in the diet(P<0.01 or P<0.05). There were no significant differences at group 4% and control group(P>0.05).20% of hop residue significantly decreased crude protein apparent retention ratio(P<0.01), calcium apparent retention ratio(P<0.01) and phosphorus apparent retention ratio(P<0.05);16% of hop residue significantly decreased crude protein apparent retention ratio(P<0.05);8% and 12% of hop residue significantly decreased calcium apparent retention ratio(P<0.01 or P<0.05);4% of hop residue decreased the apparent crude protein, calcium and phosphorus retention ratio, but not significant (P>0.05).7,The diet with hop residue less than 8% can inhibit intestinal beneficial microbe(lactic acid bacteria) and harmful microbe(escherichia coli).Respectively, more than 16%,the growth and reproduction of intestinal escherichia coli(harmful microbe) was promoted and that of intestinal lactic acid(bacteriabeneficial microbe) was significantly inhibited.There was harmful influence on intestinal microbiological balance of broilers.8,Supplement of hop residue less than 4% to the diet of broilers is completely viable with consideration of utilizing hop resource,reducing the waste of hop residue, reducing pollution to entironment and improving economic benefit.
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