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High-density diet improves growth performance and beef yield but affects negatively on serum metabolism and visceral morphology of Holstein steers.
Journal of Animal Physiology and Animal Nutrition ( IF 2.7 ) Pub Date : 2020-03-19 , DOI: 10.1111/jpn.13340
Qinghua Qiu 1 , Xinjun Qiu 1 , Chaoyu Gao 1 , Aziz Ur Rahman Muhammad 2 , Binghai Cao 1 , Huawei Su 1
Affiliation  

The objective of this study was to evaluate the effect of different dietary densities on growth performance, carcass characteristics, meat quality, serum metabolism, ruminal papillae morphology and liver injuries of steers. For this purpose, a total of eighteen Holstein steers were randomly fed one of the three diets: high energy and protein diet (H), standard energy and protein diet (C), and low energy and protein diet (L) for 11 months fattening with three‐step finishing strategy. Steers fed with H diet had higher (p < .05) average daily gain, feed efficiency, hot carcass weight, serum aspartate aminotransferase to alanine aminotransferase ratio, and monounsaturated fatty acids along with continuous low ruminal pH value, severer hepatic steatosis and ruminal papillae parakeratosis. Meanwhile, steers fed L diet increased the proportion of C20:0, C22:6n‐3, saturated fatty acids and n‐3 polyunsaturated fatty acids along with lower n‐6 to n‐3 ratio in longissimus dorsi muscle as compared to that of steers fed H diet. Dietary densities did not influence (p > .10) proximate nutrients and sensory characteristics of beef. The present study indicates that Holstein steers could achieve better growth and carcass performance under high‐density diet, whereas they are under threat of visceral injuries and metabolic disorders. This study gives comprehensive relationship between productivity and animal health and suggests that a proper diet should be adopted for fattening Holstein steers in consideration of both beef quality and quantity and animal health.

中文翻译:

高密度饮食可改善生长性能和牛肉产量,但会对荷斯坦ste公牛的血清代谢和内脏形态产生负面影响。

这项研究的目的是评估不同饮食密度对生长性能,car体特性,肉质,血清代谢,瘤胃乳头形态和and牛肝损伤的影响。为此,总共向18个荷斯坦stein牛随机喂食三种饮食之一:高能量和蛋白质饮食(H),标准能量和蛋白质饮食(C)和低能量和蛋白质饮食(L),持续11个月的育肥三步整理策略。饲喂高脂饮食的牛较高(p <.05)的平均日增重,饲料效率,hot体热重,血清天冬氨酸转氨酶与丙氨酸转氨酶之比,单不饱和脂肪酸以及瘤胃pH值持续低下,严重的肝脂肪变性和瘤胃乳头状角化病。同时,饲喂L日粮的ste牛增加了背最长肌的C20:0,C22:6n-3,饱和脂肪酸和n-3多不饱和脂肪酸的比例,同时降低了n-6与n-3的比例。 ers饲H饮食。饮食密度不影响(p > .10)牛肉的营养成分和感觉特征。本研究表明,在高密度饮食下,荷斯坦stein牛可以实现更好的生长和car体性能,而它们面临内脏伤害和代谢紊乱的威胁。这项研究给出了生产力与动物健康之间的综合关系,并建议应考虑到牛肉的质量和数量以及动物健康,采用适当的饮食来增肥荷斯坦stein牛。
更新日期:2020-03-19
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