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较轻和较重的初始重量对单源牛肉公牛的生长性能和尸体特征的影响

Thomas C Norman¹, Erin R DeHaan¹, Forest L Francis¹

¹Department of Animal Science, South Dakota State University, Brookings, SD 57007, USA.

Animals : an open access journal from MDPI

|February 24, 2024

概括

较重的初始重量转向显示出更大的增长,但降低了料效率. 与较轻的牛相比,更重的牛也产生了更肥胖的尸体,有更高的石分数.

科学领域:

动物科学动物科学
牛肉牛生产牛肉牛生产
料管理料管理

背景情况:

最初的体重 (BW) 是影响料区性能的一个关键因素.
了解初始BW对生长,料利用和尸体特征的影响对于优化牛肉生产至关重要.

研究的目的:

确定初始体重 (BW) 如何影响生长表现,饮食净能量 (NE) 利用效率以及料场牛的尸体特征.
为了比较初始轻量级 (LIW) 和初始重量级 (HIW) 牛群之间的结果.

主要方法:

一个为期209天的养场实验,涉及70只夏洛莱×红格斯牛.
根据初始的身体质量,马匹被分为两组:LIW (273 ± 16.0 公斤) 和HIW (356 ± 14.2 公斤).
数据被分析使用随机的完整块设计,用笔作为实验单位.

主要成果:

高初始体重 (HIW) 的公牛表现出更高的最终BW,体调整后的BW和每日料摄入量 (DMI).
与LIW牛相比,HIW牛的累积平均日益 (ADG) 较高,但料转换较差.
HIW牛生产的尸体具有更高的热尸体重量 (HCW),大理石分数和产量等级 (YG),但每个HCW的皮面积减少.

结论:

最初的体重显著影响养场牛的生长表现和尸体特征.
较重的初始重量方向盘实现更大的整体增长,但料效率较低.
牛的初始BW影响了尸体的脂肪和大理石化,更重的牛产生更肥的尸体.

关键词:

牛肉是牛肉,牛肉就是牛肉.身体重量体重体重饮食净能量是指饮食中的净能量.

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