Effects of Xylo-Oligosaccharides and Taurine on Growth Performance,Diarrhea Rate and Nutrient Apparent Digestibility of Calves
This experiment was designed to explore the effects of xylo-oligosaccharide(XOS)and taurine(Tau)on growth performance,diarrhea rate and nutrient apparent digestibility of calves.Select 60 healthy male Holstein calves aged around 45 days of age and divide them into 4 groups according to the principle of similar weight[(80±1)kg](each group had 15 replicates,with 1 cow per replicate).The 4 groups were the control group(C group),10 g/(d·calf)XOS group(X group),4 g/(d·calf)Tau group(T group),10 g/(d·calf)XOS+4 g/(d·calf)Tau group(XT group).The additives were fed to the calves until 77 days of age.Calf feed intake and diarrhea rate were recorded daily.Calves were weighed and measured before morning feeding at 45,63,77 and 93 days of age.Feces were collected for 3 consecutive days at 63,77 and 93 days of age to determine apparent digestibility of nutrients.The results showed as follows:1)there was no significant difference in the initial weight of calves among the four groups(P＞0.05),while the final weight of calves in the T group was significantly higher than that that in the C and XT groups(P＜0.05).At the age of 45 to 63 days,there was no significant difference in average daily gain(ADG)and average daily feed intake(ADFI)among the four groups of calves(P＞0.05).The feed to weight ratio(F/G)in the X,T,and XT groups was significantly lower than that in the C group(P＜0.05).At the age of 64 to 77 days,there were no significant differences in ADG,ADFI and F/G among the four groups of calves(P＞0.05).At the age of 78 to 93 days,the ADG in T group was significantly higher than that in C,X and XT groups(P＜0.05),and the ADFI was significantly higher than that in C group(P＜0.05),but there was no significant difference com-pared with X and XT groups(P＞0.05);there was no significant difference in F/G among the four groups(P＞0.05).Age had a significant impact on the growth performance of calves.As the age increase,the ADG and ADFI of calves significantly increased(P＜0.05),F/G significantly decreased(P＜0.05).The interaction effect between treatment and age had no significant effect on growth performance(P＞0.05).2)The diarrhea rate and fecal score of calves aged 45 to 63 days in the X,T and XT groups were significantly lower than those in the C group(P＜0.05).Compared with the C group,the diarrhea rate of calves aged 45 to 63 days in the X,T and XT groups decreased by 30.11％,32.69％ and 34.62％,respectively.Age had a significant impact on calf diarrhea rate,and the diarrhea rate in each group gradually decreased with age.The interaction effect between treatment and age had no significant impact on diarrhea rate(P＞0.05).3)The addition of XOS and Tau had no significant effect on the body size indexes and body size indexes of calves at different time periods(P＞0.05).Age had a significant impact on the body size indexes and body size indexes of calves(P＜0.05).As age increase,the body size indexes of calves significantly increased(P＜0.05),while the body length in-dex,body index and chest circumference index significantly increased(P＜0.05),while the circumference in-dex significantly decreased(P＜0.05).The interaction effect between treatment and age had no significant effect on both body size indexes and body size indexes(P＞0.05).4)At the age of 63 and 77 days,there was no significant difference in the apparent digestibility of dry matter(DM),crude fat(EE),crude protein(CP),neutral detergent fiber(NDF)and acidic detergent fiber(ADF)among the groups(P＞0.05).At 93 days of age,the apparent digestibility of CP and NDF in the T group was significantly higher than that in the C and XT groups(P＜0.05);there was no significant difference in the apparent digestibility of DM,EE and ADF among the groups(P＞0.05).Age had a significant impact on the apparent digestibility of nutrients in calves(P＜0.05).As age increase,the apparent digestibility of nutrients in calves increased significantly(P＜0.05).The interaction effect between treatment and age had no significant effect on the apparent digestibility of nutrients(P＞0.05).In summary,adding 4 g/(d·calf)Tau to calf drinking water has the best effect on im-proving calf growth performance,diarrhea rate,apparent digestibility of CP and NDF.[Chinese Journal of Animal Nutrition,2024,36(1):374-386]
calfxylo-oligosaccharidetaurinediarrhea ratebody sizeapparent digestibility of nutrients
万方数据
维普
