Comparison Study of Growth Performance,Nutrient Digestion,Rumen Fermentation and Blood Physiological Indexes between Yaks (Bos grunniens) and Cattle (Bos taurus) under Low-Concentrate Barn Fattening北大核心CSCD |
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作者姓名: | 甘水燕 刘红山 裴成芳 吴刀知才让 周建伟 李发弟 |
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作者单位: | 1.兰州大学草地农业科技学院730020;2.天祝藏族自治县畜牧技术推广站733200; |
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基金项目: | 甘肃省重点研发计划(21YF5WA117);武威市市列科技计划(2022WWKJJHXMRWS)。 |
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摘 要: | This study was aimed to compare the growth performance, nutrient digestion, rumen fermentation and blood physiological indexes between yaks (Bos grunniens) and cattle (Bos taurus) under low-concentrate barn fattening, which provide data reference and technical support for breed and feeding technology selection of fattening beef cattle in the Qinghai-Tibetan Plateau. In this experiment, six healthy yaks [(211 ±6) kg] and six healthy Qaidam cattle [(210±7) kg], all castrated and 4 years of age, were selected and raised in individual metabolic cages. The experimental diets consisted of concentrate (2.0 kg / d per head) and forage (ad libitum) . The pre-experiment lasted for 10 days, and the trial lasted for 95 days. The results showed as follows: 1) total dry matter intake were significantly lower in yaks than cattle (P<0.05), whereas average daily gain was not different between yaks and cattle (P>0.05), therefore, feed / gain was significantly lower in yaks than cattle (P<0.05) . 2) There was no difference between yaks and cattle in apparent digestibilities of nutrients (P>0.05) . 3) Ruminal pH tended to be higher (P = 0.083), and the concentrations of iso-volatile fatty acids (VFAs) were significantly greater in yaks than cattle (P<0.05), whereas the concentrations of total volatile fatty acids (TVFA), acetate, propionate and butyrate were not significantly different between yaks and cattle (P>0.05) . 4) Concentrations of ammonia nitrogen, free amino acid nitrogen and soluble protein nitrogen in rumen were significantly greater in yaks than cattle (P<0.05) . 5) The red blood cells (RBC) amount, hemoglobin (HGB) content, hematocrit (HCT) and red blood cell volume distribution width (RDW-CV) were significantly lower (P < 0. 05), whereas mean corpuscular volume (MCV), mean corpuscular hemoglobin (MCH) content and platelets (PLT) amount were significantly higher in yaks than cattle (P<0.05) . In conclusion, yaks have lower feed intake, but have a greater feed conversion efficiency than cattle, therefore, yaks can produce a greater economic benefits than cattle under low-concentrate barn fattening system. © 2023 Authors. All rights reserved.
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关 键 词: | 牦牛 黄牛 生长性能 养分表观消化率 瘤胃发酵 血液生理指标 |
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