Energy Metabolism and Requirement of 12 to 13-Month-Old Xiangzhong Black Cattle

LIU Daoyang; FU Daibo; QU Mingren; ZHU Yuankui; LI Fuqiang; DENG Xintang

doi:10.3969/j.issn.1006-267x.2013.12.031

Chinese Journal of Animal Nutrition >

2013 , Vol. 25 >Issue 12: 3013 - 3019

DOI: https://doi.org/10.3969/j.issn.1006-267x.2013.12.031

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Energy Metabolism and Requirement of 12 to 13-Month-Old Xiangzhong Black Cattle

LIU Daoyang ,
FU Daibo ,
QU Mingren ,
ZHU Yuankui ,
LI Fuqiang ,
DENG Xintang

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1. Key Laboratory of Animal Nutrition in Jiangxi Province, Jiangxi Agricultural University, Nanchang 330045, China;
2. Hunan Tianhua Industrial Co., Ltd., Loudi 417100, China

Received date: 2013-06-23

Online published: 2013-11-19

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Abstract

This experiment was conducted to explore the energy metabolism and requirement of 12 to 13-month-old Xiangzhong black cattle. Thirty healthy Xiangzhong black cattle with a similar body weight of (275.67±13.88) kg and aged 12 to 13 months of age were selected and randomly divided into 5 groups with 6 replicates in each group. Beef cattle were fed 5 different levels of energy diets which were formulated according to the expected weight gain 1.0 kg/d of energy required for 70% (group Ⅰ), 85% (group Ⅱ), 100% (group Ⅲ), 115% (group Ⅳ) and 130% (group Ⅴ), respectively. Feeding test and digestion and metabolism test were carried out to measure the growth performance and energy metabolism indexes of Xiangzhong black cattle, and to build the models for predicting the digestive energy requirement and metabolizable energy requirement. Pre-test period was 7 d and test period was 50 d. The results showed as follows: there was a high degree of positive linear correlation between daily gain and digestive energy intake/metabolizable energy intake (R²=0.913, R²=0.906); the average daily gain of group Ⅲ (1 097 g/d) was similar to the expected result; the average daily gain (1 250 g/d) and energy utilization efficiency of group Ⅳ were maximum; gross energy digestibility, gross energy metabolic rate and gross energy digestible energy were (67.51±4.35)%, (58.05±4.49)% and (85.92±1.28)%, respectively; the digestible energy requirement and metabolizable energy requirement of Xiangzhong black cattle could be estimated by the equations:DE=0.648W^0.75+33.12DG; ME=0.506W^0.75+32.15DG. DE represented digestive energy requirement (MJ/d); ME represented metabolizable energy requirement (MJ/d); W^0.75 represented the units of metabolic body weight (kg); DG represented daily gain (kg/d). Overall, the digestible energy requirement and metabolizable energy requirement for maintenance of Xiangzhong black cattle are 0.648 and 0.506 MJ/(kg W^0.75·d), respectively. Digestible energy and metabolizable energy needed per kilogram gain are 33.12 and 32.15 MJ, respectively. China Feeding Standard of Beef Cattle (NY/T 815—2004) is suitable for the Xiangzhong black cattle.

Key words： Xiangzhong black cattle; digestive energy; metabolizable energy; requirement

Cite this article

LIU Daoyang , FU Daibo , QU Mingren , ZHU Yuankui , LI Fuqiang , DENG Xintang . Energy Metabolism and Requirement of 12 to 13-Month-Old Xiangzhong Black Cattle[J]. Chinese Journal of Animal Nutrition, 2013 , 25(12) : 3013 -3019 . DOI: 10.3969/j.issn.1006-267x.2013.12.031

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