Effects of Lactic Acid Type Compound Acidifier on Growth Performance,Nutrient Utilization,Intestinal Indices and Chicken House Air Quality of White-Feather Broilers

XU Qingqing;ZHANG Shaotao;YANG Haitao;LI Min;LI Junhui;ZHU Chengjie;YIN Ruoxin;YANG Weiren;Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention,College of Animal Science and Technology,Shandong Agricultural University;Shandong Zhongyujianxin Biotechnology Co.,Ltd.;Poultry Institute,Shandong Academy of Agricultural Sciences;

lactic acid type compound acidifier;;growth performance;;nutrient utilization;;intestinal indices;;chicken house air quality

This study was conducted to investigate the effects of lactic acid type compound acidifier on growth performance,nutrient utilization,intestinal indices and chicken house air quality of white-feather broilers. A total of 1 200 one-day-old white-feather broilers were randomly assigned into 2 groups with 6 replicates per group and 100 broilers per replicate. Broilers in the control group drank standard tap water;and those in the compound acidifier group drank the tap water containing 0. 15% lactic acid type compound acidifier daily for 6 hours in the first and the sixth week,and drank the tap water containing 0.15% lactic acid type compound acidifier every week of the second,the fourth and the sixth day for 8 hours in the second to the fifty week. The experiment lasted for 42 days. The results showed as follows:compared with the control group,1)compound acidifier extremely significantly increased the average daily gain and extremely significantly decreased the ratio of feed to gain of broilers(P<0.01). 2)Compound acidifier significantly increased the dietary ether extract and crude protein apparent utilization and serum contents of total protein and albumin of broilers(P<0.05),extremely significantly decreased the Escherichia coli number in cecum content(P<0.01). 3)Compound acidifier significantly increased the activities of amylase,lipase and trypsin in duodenum of broilers(P<0.05),extremely significantly increased the villus length in duodenum and jejunum at 21 days of age and in duodenum and ileum at 42 days of age(P < 0.01),extremely significantly increased the ratio of villus length to crypt depth in duodenum,jejunum and ileum(P<0.01),extremely significantly decreased the crypt depth in duodenum,jejunum and ileum at 21 days of age and in duodenum and jejunum at 42 days of age(P<0.01);and significantly decreased the ammonia and hydrogen sulfide concentrations in chicken house(P<0.05). In conclusion,drinking water adding lactic acid type compound acidifier can improve the growth performance and the nutrient apparent utilization of broilers,reduce the Escherichia coli number in cecum,improve the activities of digestive enzymes in small intestine,improve the absorption area of small intestine,and reduce the ammonia and hydrogen sulfide concentrations in chicken house.[Chinese Journal of Animal Nutrition,2020,32(11):5209-5220]