A comparison of average daily gain,apparent digestibilities,energy balance,rumen fermentation parameters,and serum metabolites between yaks(Bos grunniens)and Qaidam cattle(Bos taurus)consuming diets differing in energy level

作     者：Hu Liu Jianwei Zhou Allan Degen Hongshan Liu Xuliang Cao Lizhuang Hao Zhanhuan Shang Tao Ran Ruijun Long Hu Liu;Jianwei Zhou;Allan Degen;Hongshan Liu;Xuliang Cao;Lizhuang Hao;Zhanhuan Shang;Tao Ran;Ruijun Long

作者机构：State Key Laboratory of Grassland Agro-Ecosystems Key Laboratory of Grassland Livestock Industry InnovationMinistry of Agriculture and Rural Affairs Engineering Research Center of Grassland IndustryMinistry of EducationCollege of Pastoral Agriculture Science and TechnologyLanzhou UniversityLanzhou730000China International Centre for Tibetan Plateau Ecosystem ManagementCollege of EcologyLanzhou UniversityLanzhou730000China Desert Animal Adaptations and HusbandryWyler Department of Dryland AgricultureBlaustein Institutes for Desert ResearchBen-Gurion University of NegevBeer Sheva8410500Israel Key Laboratory of Plateau Grazing Animal Nutrition and Feed Science of Qinghai ProvinceQinghai Academy of Animal Science and Veterinary MedicineState Key Laboratory of Plateau Ecology and AgricultureQinghai UniversityXining810016China 

出 版 物：《Animal Nutrition》 (动物营养（英文版）)

年 卷 期：2023年第12卷第1期

页      面：77-86页

核心收录：

学科分类：090502[农学-动物营养与饲料科学] 0905[农学-畜牧学] 09[农学] 

基　　金：This work was supported by the National Natural Science Foundation of China(32072757,U21A20250) the Key Research and Development Program for International Cooperation of Gansu Province,China(21YF5WA117) Key Research and Development and Conversion Program of Qinghai Province,China(2018-SF-145) 

主　　题：Yaks Dietary energy level Average daily gain Apparent digestibility Rumen fermentation Serum metabolite 

摘      要：Yaks(Bos grunniens),indigenous to the harsh Qinghai-Tibetan Plateau,are well adapted to the severe conditions,and graze natural pasture without supplements all year *** cattle(Bos taurus),introduced to the Qinghai-Tibetan Plateau 1,700 years ago,are raised at a lower altitude than yaks,provided with shelter at night and offered supplements in *** on their different backgrounds,we hypothesized that yaks have lower energy requirements for maintenance than *** test this hypothesis,we measured average daily gain(ADG),apparent digestibilities,energy balance,rumen fermentation parameters,and serum metabolites in growing yaks and cattle offered diets differing in metabolizable energy(ME)levels(6.62,8.02,9.42 and 10.80 MJ/kg),but with the same crude protein *** castrated yaks(155±5.8 kg)and 6 castrated Qaidam cattle(154±8.0 kg),all 2.5 years old,were used in 2 concurrent 4×4 Latin square *** and acid detergent fiber digestibilities were greater(P0.05)in yaks than in cattle,and decreased linearly(P0.05)with increasing dietary energy level;whereas,digestibilities of dry matter,organic matter,crude protein and ether extract increased(P0.05)linearly with increasing energy *** ADG was greater(P0.001)in yaks than in cattle,and increased(P0.05)linearly with increasing energy *** the regressions of ADG on ME intake,the estimated ME requirement for maintenance was lower(P0.05)in yaks than in cattle(0.43 vs.0.57 MJ/kg BW0.75).The ratios of digestible energy(DE):gross energy and ME:DE were higher(P0.05)in yaks than in cattle,and increased(P0.05)linearly with increasing dietary energy *** pH decreased(P0.05),whereas concentrations of total volatile fatty acids(VFAs)and ammonia increased(P0.01)with increasing dietary energy level,and all were greater(P0.05)in yaks than in *** of ruminal acetate and iso-VFAs were greater(P0.05),whereas propionate was lower(P0.05)in yaks than in cattle