动物营养学报Issue(3)：910-917,8.DOI:10.3969/j.issn.1006-267x.2015.03.031
不同代谢蛋白质水平饲粮对8~10月龄后备奶牛生长发育、血液生化指标和体况评分的影响
Effects of Different Dietary Metabolizable Protein Levels on Growth and Development, Blood Biochemical Indices and Body Condition Scores of 8 to 10-Month-Old Heifers
摘要
Abstract
This study was conducted to investigate the effects of different dietary metabolizable protein ( MP) levels on growth and development, blood biochemical indices and body condition score ( BCS ) of 8 to 10-month-old heifers. Twenty four Chinese Holstein heifers were randomly divided into four groups with six heads per group, and were fed four different diets in which MP level was 9.03%, 9.55%, 10.09% and 10.57%, re-spectively, accordingly, IDCP level was 6.87%, 8.13%, 9.40% and 10.65%, respectively. The pre-experi-mental period was 15 days, and the experimental period was 60 days. The results showed as follows: 1) MP and IDCP satisfied the equation of MP=6.234+0.408×IDCP (R2=0.999, P<0.01, n=4). 2) The ADG in groups with MP levels of 9.03%, 9.55%, 10.09% and 10.57% was 0.93, 1.04, 1.09 and 1.00 kg/d, respec-tively, and 10. 09% group was significantly higher than 9. 03% group ( P<0. 05 ); the abdominal girth in 9.55% and 10.09% groups was significantly higher than that in 9.03% group ( P<0.05 or P<0.01) . 3) With the improvement of MP level, serum urinary nitrogen ( UN) content was increased accordingly, and 9.55%, 10.09% and 10.57% groups was significantly higher than 9.03% group at 8 to 9 months of age (P<0.01), while there was no significant difference among 9.03%, 9.55% and 10.09% groups at 10 months of age ( P>0.05) . 4) The BCS of all heifers in different groups was between 3.57 and 3.90 without significant difference (P>0.05), and the body was well developed. As growth and development, blood biochemical indices and BCS are considered, it is concluded that 10.09% MP level in diet can meet the needs of 8 to 10-month-old Chi-nese Holstein heifers gaining 1.09 kg/d in the present experimental condition.关键词
代谢蛋白质/荷斯坦后备奶牛/生长发育/体况评分Key words
metabolizable protein/Holstein heifers/growth and development/body condition score分类
农业科技引用本文复制引用
葛汝方,陈青,霍永久,朱建民,王梦芝,喻礼怀,王洪荣..不同代谢蛋白质水平饲粮对8~10月龄后备奶牛生长发育、血液生化指标和体况评分的影响[J].动物营养学报,2015,(3):910-917,8.基金项目
国家“十二五”科技支撑计划课题“后备牛营养需要量参数及配套精细饲养工艺研究”(2012BAD12B02-2) （2012BAD12B02-2）
