Effects of Cotton Residue Biofeed on Growth Performance,Rumen Fermentation Parameters,Blood Indices and Rumen and Rectal Flora Structure of Fattening Cattle
The aim of this experiment was to study the effects of cotton residue biofeed on growth perform-ance,rumen fermentation parameters,blood indices and rumen and rectal flora structure of fattening cattle.Sixty Angus beef cattle weighing(306.71±2.69)kg were selected and randomly divided into 3 groups with 20 cattle in each group.Cattle in the control group(CK group)were fed a basal diet,and others in experimental groups were fed the experimental diets which used cotton residue biofeed replacing 30％(group H)and 45％(group S)corn silage in the basal diet.The pre-experimental period lasted for 15 days,and the experimental period lasted for 60 days.The results showed as follows:1)the average daily dry matter intake of group H was significantly higher than that of group CK and group S(P＜0.05).The average daily gain of group S was sig-nificantly lower than that of group CK and group H(P＜0.05),and the feed to gain ratio was significantly higher than that of group CK and group H(P＜0.05).2)The rumen pH and ammoniacal nitrogen content of group CK were significantly lower than those of group H(P＜0.05).The rumen acetic acid content of group S was significantly lower than that of group CK and group H(P＜0.05),and the rumen propionic acid content of group H was significantly higher than that of group CK and group S(P＜0.05);the rumen acetic acid/propi-onic acid of group H and group S was significantly lower than that of group CK(P＜0.05),and group S was significantly lower than group H(P＜0.05).3)The blood white blood cell count,aspartate transaminase activ-ity and albumin and triglyceride contents of group CK were significantly lower than those of group S(P＜0.05).The blood urea nitrogen content of group H and group S was significantly higher than that of group CK(P＜0.05),and group S was significantly higher than group H(P＜0.05).The blood hydroxybutyrate dehy-drogenase and lactate dehydrogenase activities of group H were significantly lower than those of group S(P＜0.05).The blood glucose content of group H was significantly higher than that of group CK and group S(P＜0.05).4)At the phylum level,the rumen and rectal dominant phyla of 3 groups were Firmicutes and Bacteroi-dota.At the genus level,the rumen dominant genera of group CK were Prevotella,Lachnospiraceae_NK3A20_group and Rikenellaceae_RC9_gut_group,the rumen dominant genera of group H were Streptococ-cus,Weissella and Prevotella,and the rumen dominant genera of group S were Lactococcus,Weissella and Rikenellaceae_RC9_gut_group;the rectal dominant genera of group CK were Romboutsia,Turicibacter and Clostridium_sensu_stricto_1,the rectal dominant genera of group H were Enterococcus,Clostridium_sensu_stricto_1 and Romboutsia,and the rectal dominant genera of group S were Enterococcus,Turicibacter and Romboutsia.In summary,replacing corn silage with 30％cotton residue biofeed in the diet is beneficial for growth of fattening cattle,can reduce the stress sensitivity and acidosis,and can change the rumen and rectal flora structure at the genera level.[Chinese Journal of Animal Nutrition,2024,36(11):7097-7107]
万方数据
维普
