Effects of Dietary Energy and Protein Levels on Growing-Fattening Performance and Blood Biochemical Indicators of Holstein Bulls

LI Xiaomeng, LI Qiufeng, CAO Yufeng, GAO Yanxia, YU Chunqi, DU Liuliu, WANG Xiaoling, LI Jianguo

doi:10.3969/j.issn.1006-267x.2015.04.032

2015 , Vol. 27 >Issue 4: 1252 - 1261

DOI: https://doi.org/10.3969/j.issn.1006-267x.2015.04.032

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Effects of Dietary Energy and Protein Levels on Growing-Fattening Performance and Blood Biochemical Indicators of Holstein Bulls

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1. College of Animal Science and Technology, Agricultural University of Hebei, Baoding 071001, China;
2. Fucheng Wufeng Food Limited Company, Sanhe 065200, China

Received date: 2014-10-14

Online published: 2015-04-21

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Abstract

The objective of this study was to evaluate the effects of different dietary energy and protein levels on growing-fattening performance and blood biochemical indicators of Holstein bulls to select the most appropriate levels of nutrition parameters. Thirty Holstein bulls (weighted about 180 kg, aged 4 to 5 months) were allocated into three groups with ten bulls in each group. The three groups were provided with different nutritional level diets: low energy and protein levels diet (group Ⅰ), medium energy and protein levels diet (group Ⅱ) and high energy and protein levels diet (group Ⅲ). The experiment lasted for 362 days. The results showed as follows: 1) compared with group Ⅰ, daily gain (DG) in group Ⅲ was significantly increased (P<0.05) and that in group Ⅱ had an increasing trend (P>0.05), while feed/gain in group Ⅲ was decreased compared with that in groups Ⅰ and Ⅱ (P>0.05). 2)The contents of blood glucose and growth hormone in group Ⅲ were significantly increased compared with those in group Ⅰ (P<0.05), but no significant difference was found between groups Ⅱ and Ⅲ (P>0.05). The content of blood urea nitrogen in group Ⅲ was significantly decreased compared with that in group Ⅰ (P<0.05). 3) With the increasing of dietary energy and protein levels, apparent digestibility of crude protein and crude fat was raised, and group Ⅲ was significantly higher than group Ⅰ (P<0.05). According to above results, net energy for lactation [NE_L, MJ/(d·head)] and small intestinal digestible crude protein (IDCP) requirements [g/(d·head)] of growing-fattening Holstein bulls (weighted 180 to 500 kg) are calculated based on metabolic weight (W^0.75, kg) and DG (kg) as follows: NE_L=0.57W^0.75+1.02DG (R²=0.936 8); IDCP=2.65W^0.75+202.03DG (R²=0.892 9).

Key words： Holstein bull; energy; protein; growing-fattening performance; blood biochemical indicator

Cite this article

LI Xiaomeng, LI Qiufeng, CAO Yufeng, GAO Yanxia, YU Chunqi, DU Liuliu, WANG Xiaoling, LI Jianguo . Effects of Dietary Energy and Protein Levels on Growing-Fattening Performance and Blood Biochemical Indicators of Holstein Bulls[J]. Chinese Journal of Animal Nutrition, 2015 , 27(4) : 1252 -1261 . DOI: 10.3969/j.issn.1006-267x.2015.04.032

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