Effects Of Arginine,Gamma-Aminobutyric Acid,Organic Chromium And Selenium On Yellow-Feathered Broilers Exposed To Heat Stress

Yellow-feathered broilers are widely distributed in East and Southeast of China.Compared with white-feathered broilers,they are small in size,slow growth rate,and sensitive to the external environment.The absorption and metabolism of the same additives may also be different in this body.Meanwhile,yellow-feathered broiler has a large amount of slaughter,which has reached or exceeded half of the broiler’s slaughter.However,there are few reports on its anti-heat stress additives.So it is important to study some additives that could relieve heat stress on actual production.Therefore,this experiment selected several additives such as arginine,γ-aminobutyric acid,organic chromium and selenium which exert effective anti-heat stress effects on other animals,and studied their effects on yellow-feathered broilers exposed to heat stress.Experiment 1: This experiment studied the effects of arginine on yellow-feathered broilers exposed to heat stress.240 35-day-old male yellow-feathered broilers were selected and separated into 4 groups with 6 replicates with 10 birds,which according to 2*2 factors(temperature and arginine).This groups included normal temperature group(basal diets),normal temperature + arginine group(added 0.6% Arg into basal diets),heat stress group,heat stress + arginine group(added 0.6% Arg into basal diets).After giving experimental diets on 7 days,7 days of heat stress were given.Results showed that heat stress improved the body temperature,breathing rate and F/G significantly(P<0.05),while decreased ADFI,ADG and the activities of antioxidant enzymes in yellow-feathered broilers(P<0.05).There were no significant effects on body temperature,breathing rate,ADFI,ADG,F/G and the activities of antioxidant enzymes after giving 0.6% arginine to yellow-feathered broilers(P>0.05).In summary,heat stress significantly reduced the growth performance and antioxidant function of yellow-feathered broilers,while 0.6% arginine showed no effects on growth performance in yellow-feathered broilers,only found that it increased the antioxidant function of the body to a certain extent.Experiment 2: This experiment studied the effects of N-carmine glutamic acid(NCG)on yellow-feathered broilers exposed to heat stress.270 1-day-old male yellow-feathered broilers were selected and randomly divided into control group,the pre-addition group(1-18 d,added at 0.1%)and the whole addition group(1-49 d,added at 0.1%),with 6 replicates with 15 birds.Weight at 36 d,and adjusted at 10 birds per pen,which according to the average weight of per replicate.Then gave heat stress at 35℃ and lasted for 14 d.Results showed that nosignificant effects on body temperature,breathing rate,ADG,ADFI,F/G,meat quality,the relative weight of organs and the activities of some antioxidant enzymes between the control group and the whole addition group(P>0.05),there also had no significant effects between the control group and the pre-addition group(P>0.05),which indicated that adding 0.1%NCG to the diets failed to alleviate the growth performance,organ development and antioxidant function of yellow-feathered broilers exposed to heat stress.Experiment 3: This experiment studied the effects of GABA,organic chromium and selenium on yellow-feathered broilers exposed to heat stress.240 35-day-old male yellowfeathered broilers were selected and separated into 4 groups with 6 replicates with 10 birds,which included control group(basal diets),GABA group(added 100mg/kg GABA into basal diets),chromium picolinate group(added 1.20mg/kg organic chromium),sodium selenite group(added 0.30mg/kg selenium).After giving experimental diets on 7 days,14 days of heat stress were given at 35℃.Results showed that 100mg/kg GABA,1.20mg/kg organic chromium and 0.30mg/kg selenium can significantly increase BW,ADG and ADFI(P<0.05),while reduce F/G,the activities of some enzymes that reflected organ damage and antioxidant function significantly(P<0.05),selenium also increased the relative weight of immune organs and villus height of intestine(P<0.05).In conclusion,100mg/kg GABA,1.20mg/kg organic chromium and 0.30mg/kg selenium can improve growth performance,immune and antioxidant function,as well as protecting intestine health in yellow-feathered broilers exposed to heat-stressed conditions.