一种新型缓释尿素替代日粮中部分豆粕对肉牛生长性能、养分消化率及血液生化指标的影响

doi:10.16431/j.cnki.1671-7236.2019.04.005

Abstract

Abstract:

This study was aimed to investigate the effects of a new slow-release urea substituting dietary part of some soybean meal on growth performance,nutrient digestibility and blood biochemical indexes of beef cattle.Eighteen healthy 7-month-old Simmental hybrid cattle weighted (315±5) kg were randomly divided into three groups:Soybean meal group,slow-release urea group and common urea group,with 6 cattle in each group.Soybean meal group was fed a test diet containing 11.12% (15.51% crude protein (CP),48.06% dry matter (DM)) of soybean meal (concentrate to forage ratio was 4:6).According to the principle of isoenergetic and isonitrogenic,the slow-release urea and common urea groups were fed with slow-release urea and common urea accounted for 1.41% and 1.15% of the respective diets,respectively.That is,75% of the soybean meal in the soybean meal group was replaced by slow-release urea and ordinary urea in the two test groups.Pre-test period was 14 days,and formal test period was 60 days.The results showed as follows:① There was no significant difference in average daily gain (ADG) and feed:gain (F/G) among all groups (P>0.05),but the average dry matter intake (ADMI) in slow-release urea and common urea groups was significantly lower than that in soybean meal group (P<0.05).② The apparent digestibility of DM and organic matter (OM) in slow-release urea and common urea groups were significantly higher than that in soybean meal group (P<0.05);The apparent digestibility of CP in slow-release urea group was significantly lower than that in common urea group (P<0.05),but there was no significant difference between slow-release urea and soybean meal groups (P>0.05);The apparent digestibility of ether extract (EE) was the lowest in common urea group and the highest in soybean meal group,and there was a significant difference among all groups (P<0.05);There was no significant difference in the apparent digestibility of neutral detergent fiber (NDF) and acid detergent fiber (ADF) among all groups (P>0.05).③ Compared with the soybean meal group,the replacement of some soybean meal by slow-release urea in the diet did not affect the blood biochemical indicators of beef cattle (P>0.05);The albumin (ALB),alanine aminotransferase (ALT) and aspartate transaminase (AST) in slow-release urea group were significantly higher than that in common urea group (P<0.05).The results showed that some soybean meal in the diet could be replaced by slow-release urea and common urea in the production of beef cattle,and the effect of soybean meal being replaced by slow-release urea was better than that of common urea.

Key words: beef cattle; slow-release urea; growth performance; nutrient digestibility; blood biochemical indexes

CLC Number:

S816.7

ZHAO Erlong, FENG Chunyan, WANG Jianfei, BAI Jun, LI Yanjiao, LI Meifa, XIN Junping, GE Yu, LI Lizhi, LIANG Huan, XU Lanjiao, QU Mingren, LI Tingting. Effect of a Slow-release Urea Substituting Dietary Soybean Meal on Growth Performance,Nutrient Digestibility and Blood Biochemical Indexes of Beef Cattle[J]. , 2019, 46(4): 994-1001.

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Effect of a Slow-release Urea Substituting Dietary Soybean Meal on Growth Performance,Nutrient Digestibility and Blood Biochemical Indexes of Beef Cattle

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