育肥后期锦江牛能量代谢规律及需要量的研究

doi:10.16431/j.cnki.1671-7236.2019.03.011

Abstract

Abstract:

This experiment was conducted to investigate the energy metabolism and requirement of Jinjiang steers in the latter stage of fattening.The Jinjiang steers in the present study were chosen from our previous study,which were fed at different energy levels in the early stage of fattening (The NE_mf of the five diets were 6.02,6.38,6.74,7.10 and 7.46 MJ/kg with 10 heads per group and test period was 116 d).After the early stage of fattening,the group were unchanged and the total of 35 remaining cattle with (355.94±35.11) kg average body weight in five group were re-continued for fattening feeding.The steers were fed 5 diets with different energy levels,which were formulated according to 100% (group A),106% (group B),112% (group C),118% (group D) and 124% (group E) of NE_mf for the expected weight gain of 1.2 kg/d (China Feeding Standards of Beef Cattle (NY-T 815－2004)),respectively.The NE_mf in five diets of groups A,B,C,D and E were 6.21,6.58,6.95,7.33 and 7.70 MJ/kg,respectively.The feeding test and digestion and metabolism test were carried out to measure the growth performance and energy metabolism indexes of Jinjiang steers,and then the models were built to predict the digestive energy requirement and metabolism energy requirement.The pre-test period was 10 d and test period was 128 d.The results showed as follows:①The total energy intake of Jinjiang steers at the latter stage of fattening of groups D and E was significantly reduced than that of other groups (P<0.05).②Group B had the highest energy utilization efficiency,with total energy digestibility and metabolic rate were 90.59% and 83.36%,respectively.③There was a positive linear correlation between average daily gain and digestive energy intake/metabolizable energy intake (R²=0.997,R²=0.993),the digestive energy requirement and metabolizable energy requirement of Jinjiang steers could be estimated by the following equations:DE_m=0.770W^0.75＋40.088×ADG;ME_m=0.645W^0.75＋38.603×ADG (DE_m represented digestive energy requirement (MJ/d);ME_m represented metabolizable energy requirement (MJ/d);W^0.75represented metabolic body (kg);ADG represented average daily gain (kg/d)).The digestive energy requirement and metabolizable energy requirement for maintenance of Jinjiang steers were 0.770 and 0.645 MJ/(kg W^0.75·d),respectively.Digestible energy and metabolizable energy required for per kilogram of body weight gain were 40.088 and 38.603 MJ,respectively.

Key words: Jinjiang steers; digestible energy; metabolic energy; energy requirement

CLC Number:

S823

BAI Jun, ZHAO Erlong, LI Meifa, XIN Junping, XU Lanjiao, QU Mingren, YI Zhonghua, YANG Shitang, YANG Jianjun, LI Yanjiao. Energy Metabolism and Requirement of Jinjiang Cattle in the Latter Stage of Fattening[J]. , 2019, 46(3): 732-739.

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Energy Metabolism and Requirement of Jinjiang Cattle in the Latter Stage of Fattening

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