评估制定的饮食净能量值和从完成牛肉牛的生长性能中确定的净能量值之间的差异
Michael L Galyean1, Kristin E Hales2, Zachary K Smith3
1Department of Veterinary Science, Texas Tech University, Lubbock 79409, USA.
Journal of animal science
|July 9, 2023
概括
从养场牛生长绩效数据中计算维护 (NEm) 和收益 (NEg) 的净能量显示出与表格值的良好一致. 然而,这些预测的准确性是有限的,需要进一步的研究来提高肉牛营养管理的准确性.
科学领域:
- 动物营养和新陈代谢
- 动物生理学 动物生理学
- 肉牛生产系统 肉牛生产系统
背景情况:
- 加利福尼亚净能源系统允许将干物质摄入量 (DMI) 分为养场牛的维护和增益成分.
- 准确估计维护净能量 (NEm) 和净能量增益 (NEg) 对于优化牛生长性能和评估管理决策至关重要.
研究的目的:
- 评估从生长性能数据中预测的NEm和NEg值以及从料成分的表格能量值中得出的值之间的一致性.
- 确定影响生长表现预测牛肉的NEm和NEg值精度的因素.
主要方法:
- 利用了来自21项研究的747笔资料,将增长性能预测的NEm和NEg与2016年国家科学院出版物中的表格值进行比较.
- 使用回归分析与随机研究效应的调整来评估预测和表格能量值之间的一致性.
- 分析了余量和评估变量,如增益:料比率,食成分,生长性能,尸体特征和能量,以解释预测的不精确性.
主要成果:
- 回归分析表明,增长绩效预测与表格NEm和NEg值之间的截止点 (接近零) 和斜率 (接近一) 之间没有显著差异.
- 对于NEm和NEg的余量平均分别为-0.003和-0.005,表明接近一致,但突出了潜在的精度问题.
- 预测的准确性是适度的,只有40.3%的NEm和30.9%的NEg值在表格值的2.5%之内;增益:料比率显示了五分位数之间的差异,但解释了维护能源需求或保留能源的变化很小.
结论:
- 虽然增长性能预测的NEm和NEg与表格值保持一致,但它们的精度不足以对肉牛进行高度准确的预测.
- 收益:料比,虽然是一个有区别的变量,但并没有显著改善能源组件的预测.
- 为了提高净能预测的精度,需要进一步研究,包括包含详细的饮食,生长,尸体和环境数据的大型数据集,以及关于维护要求和能量保留的基本研究.
更多相关视频
09:09Protocol for Assessing the Relative Effects of Environment and Genetics on Antler and Body Growth for a Long-lived Cervid
Published on: August 8, 2017
7.4K
08:29Measuring Liver Mitochondrial Oxygen Consumption and Proton Leak Kinetics to Estimate Mitochondrial Respiration in Holstein Dairy Cattle
Published on: November 30, 2018
11.4K
相关概念视频
01:01Production Efficiency
16.9K
Net production efficiency (NPE) is the efficiency at which organisms assimilate energy into biomass for the next trophic level. Due to low metabolic rates and less energy spent on thermoregulatory processes, the NPE of ectotherms (cold-blooded animals) is 10 times higher than endotherms (warm-blooded animals).
16.9K
01:29Oxygen Requirements and Growth Patterns
162
Microorganisms exhibit diverse oxygen requirements and growth patterns driven by their metabolic strategies and environmental adaptations. Oxygen, while essential for many organisms, can also be toxic under certain conditions, shaping how microorganisms grow and survive.Oxygen Requirements of MicroorganismsMicroorganisms are classified based on their ability to use or tolerate oxygen:Obligate aerobes like Mycobacterium tuberculosis need oxygen for energy production, as it serves as the terminal...
162
01:19Energy Balance
462
The human body gets energy from the three macronutrients: carbohydrates, proteins, and fats. Energy is released when the chemical bonds in the organic compounds present in the food are broken down. The energy content of food is measured in kilocalories (kcal), defined as the amount of heat required to raise the temperature of one kilogram of water by one degree Celsius. This value is determined by measuring the temperature change of the water surrounding a calorimeter after the complete...
462
00:51Energy Budgets
9.3K
Organisms must balance energy intake with the energy required for growth, maintenance and reproduction. These trade-offs result in a variety of survivorship and reproductive strategies, including semelparity and iteroparity. Semelparous species, like annual plants, have only one reproductive episode in their lifetimes and consequently have short lifespans. Iteroparous species, by contrast, have many reproductive events during their lifetimes but have relatively few offspring. These two...
9.3K