Effects of sunflower straw replacement of corn stover on digestive performance,lactation performance,rumen fermentation indexes,and serum biochemical indexes of dairy cows
The paper was to investigate the effects of sunflower straw replacing corn stover on the digestive performance,lactation performance,rumen fermentation indexes,and serum biochemical indexes of dairy cows.Eighty Chinese Holstein cows with no significant differences in parity,body weight,and milk yield were selected and randomly divided into four groups of 20 replicates each,with each head as a replicate.The control group was fed a basal diet,and unflower straw in the experimental groups was replaced with 20％(Group Ⅰ),50％(Group Ⅱ),and 100％(Group Ⅲ)corn stover in the basal diet,respectively.The experiment lasted for 100 days,including 10 days of pre-test and 90 days of formal experiment.The results showed that compared with the control group,the dry matter intake of the three experimental groups was significantly increased(P＜0.05),the apparent digestibility of dry matter was significantly increased(P＜0.05),the apparent digestibility of crude protein in all experimental groups was extremely increased(P＜0.01).The somatic cell count in the milk of Group Ⅱwas significantly reduced(P＜0.05),the microbial protein content in Group m was significantly decreased(P＜0.05).Groups Ⅱ and Ⅲ showed a significant increase in the levels of total protein and albumin in serum at 60 and 90 days(P＜0.05).The production efficiency of Group Ⅰ increased by 4.51 yuan/head per day.The study shows that replacing corn stover with 20％sunflower stalks can increase dairy cows'feed intake,improve digestion and absorption of nutrients,and improve milk production and quality,with no adverse effects on the rumen environment and liver and kidney function,and with better economic benefits.
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