评估和开发用于预测哺乳犊牛摄入量和生长的营养模型

Ruminants Pub Date : 2024-01-28 DOI:10.3390/ruminants4010004
G. C. Baldin, Caleb Hildebrand, Robert L. Larson, P. A. Lancaster
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引用次数: 0

摘要

本研究的目的是评估和建立预测犊牛在整个哺乳期的饲料摄入量和生长的方程,这些犊牛是吃牧草的肉用犊牛,还是吃收割的牧草的奶用犊牛。从已发表的论文(一篇使用奶瓶喂养奶牛犊牛,一篇使用哺乳期肉牛犊牛)中收集了奶和饲料的摄入量以及个体动物的体重数据。利用牛奶和饲料摄入方程以及生长方程构建了营养模型。此外,还从文献中收集了其他数据集,以便根据草料消化率、牛奶成分和生长情况制定调整原始营养模型的方程。总体而言,原始营养模型预测奶牛犊牛的饲料摄入量和体重的精确度为中高水平(CCC = 0.234 到 0.929),准确度较低(MB = -341.16 到 -1.58%)。此外,原始营养模型预测肉用犊牛的饲料摄入量和体重的精确度(CCC = 0.348 至 0.766)和准确度(MB = 6.39 至 57.67%)为中差。调整后的营养模型表现较好,最佳模型可精确(CCC = 0.914)预测饲草采食量,可精确(CCC = 0.978)且准确(MB = 2.83%)预测乳牛体重。调整后的最佳营养模型能高精度(CCC = 0.882 和 0.935)和中等精度(MB = -7.01 和 -7.34)预测肉用犊牛的饲料采食量和体重。对标准乳能量浓度和生长方程进行调整后,营养模型能够充分预测犊牛的饲料摄入量和生长情况。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluation and Development of a Nutrition Model to Predict Intake and Growth of Suckling Calves
The objective of this study was to evaluate and develop equations to predict forage intake and growth of calves throughout the suckling period of beef calves grazing on forage or dairy calves fed harvested forage. Milk and forage intake and body weight data for individual animals were collected from published theses (one using bottle-fed dairy calves and one using suckling beef calves). A nutrition model was constructed using milk and forage intake equations and growth equations. Additional datasets were compiled from the literature to develop equations to adjust the original nutrition model for forage digestibility, milk composition, and growth. In general, the original nutrition model predicted the forage intake and body weight of dairy calves with moderate-to-high precision (CCC = 0.234 to 0.929) and poor accuracy (MB = −341.16 to −1.58%). Additionally, the original nutrition model predicted forage intake and body weight in beef calves with poor-to-moderate precision (CCC = 0.348 to 0.766) and accuracy (MB = 6.39 to 57.67%). Adjusted nutrition models performed better with the best model precisely (CCC = 0.914) predicting forage intake and precisely (CCC = 0.978) and accurately (MB = 2.83%) predicting body weight in dairy calves. The best adjusted nutrition model predicted forage intake and body weight with high precision (CCC = 0.882 and 0.935) and moderate accuracy (MB = −7.01 and −7.34) in beef calves. Nutrition models were able to adequately predict the forage intake and growth of calves with adjustments made to standard milk energy concentrations and growth equations.
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