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

GE Rufang, CHEN Qing, HUO Yongjiu, ZHU Jianmin, WANG Mengzhi, YU Lihuai, WANG Hongrong

doi:10.3969/j.issn.1006-267x.2015.03.031

2015 , Vol. 27 >Issue 3: 910 - 917

DOI: https://doi.org/10.3969/j.issn.1006-267x.2015.03.031

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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

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1. College of Animal Science and Technology, Yangzhou University, Yangzhou 255009, China;
2. The Experiment Farm of Yangzhou University, Yangzhou 255008, China

Received date: 2014-09-25

Online published: 2015-03-18

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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%, respectively, accordingly, IDCP level was 6.87%, 8.13%, 9.40% and 10.65%, respectively. The pre-experimental 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, respectively, 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 Chinese Holstein heifers gaining 1.09 kg/d in the present experimental condition.

Key words： metabolizable protein; Holstein heifers; growth and development; body condition score

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GE Rufang, CHEN Qing, HUO Yongjiu, ZHU Jianmin, WANG Mengzhi, YU Lihuai, WANG Hongrong . 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[J]. Chinese Journal of Animal Nutrition, 2015 , 27(3) : 910 -917 . DOI: 10.3969/j.issn.1006-267x.2015.03.031

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