Effects of RFI classification and strategic supplementation of low quality diets to optimize beef cow performance

RFI 分类和低质量日粮策略补充对优化肉牛生产性能的影响

• 批准号: 460734-2013
• 负责人: Mandell, Ira
• 金额: $ 2.21万
• 依托单位: University of Guelph
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=597819
• 关键词: Effects; RFI; classification; strategic; supplementation

The beef cow is often managed to meet nutrient requirements for only a limited time of the year. During the rest of the year, the cow may be fed diets, deficient or limiting in one or more nutrients. Ontario is blessed with the ability to produce nutrient dense forages which can be are wasted on beef cows if fed ad libitum throughout the year. Cow-calf producers can make more money on these high quality forages by feeding them to weaned calves and growing cattle. Nutritional strategies need to be developed to use lower quality forages where there is strategic supplementation of nutrients to ensure the health and reproductive success of the gestating cow. This approach offers the most viable solution to lower cost of production and increase returns to cow-calf producers. The study will evaluate the following nutritional management programs: 1) feeding high quality forages ad lib to ensure intake of all essential nutrients but at a cost of wasting nutrients and depositing excess condition on cows, 2) feeding high amounts of crop residues which may compromise the nutritional needs of the cow without supplementation, & 3) strategic supplementation of low quality diets such that supplementary nutrients are only provided at specific time intervals (weekly, twice per week, or 3 times per week). Research is also needed to examine genetics of feed efficiency or residual feed intake (RFI) in beef cows and evaluate these genetics across diverse nutritional programs. Cows classified as low RFI are more efficient at converting feed for maintenance and production purposes. Costs of production should decrease if the cow herd is made up predominantly of low RFI cows. The experimental design of the project will test the success of specific nutritional management programs and how specific genetics perform when nutrients are limiting. This will include assessing growth performance, body condition, reproductive performance, and calf production. This project will demonstrate how specific genetics perform across diverse nutritional regimens, and how strategic supplementation of low quality diets can be used to lower costs of production for Ontario cow-calf producers.

牛肉牛通常只能在一年中的有限时间内满足营养需求。在今年的剩余时间里，牛可能会被喂食，一种或多种营养素不足或限制。安大略省有能力产生营养密集的饲料，如果全年供气，牛肉奶牛可能会浪费牛奶。牛排生产商可以通过将它们喂给断奶犊牛和种植牛，从而在这些高质量的草料上赚更多的钱。需要开发营养策略，以使用较低的质量饲料，在策略补充营养，以确保妊娠牛的健康和生殖成功。这种方法为降低生产成本并增加了牛群生产商的回报提供了最可行的解决方案。该研究将评估以下营养管理计划：1）进食高质量的草料，以确保摄入所有必需的营养素，但要付出浪费营养和对奶牛的过量状况的成本，2）2）喂养高量的物种残留物，这些残留物可能会损害牛的营养需求，而无需补充饮食，并提供了饮食量的较低的饮食（3）策略性的饮食（3）策略性的饮食（3）每周两次，或每周3次）。还需要研究以检查牛奶牛中的饲料效率或残留饲料摄入量（RFI）的遗传学，并在各种营养计划中评估这些遗传学。归类为低RFI的母牛在转换饲料以进行维护和生产目的方面更有效。如果牛群主要由低RFI母牛组成，则生产成本应降低。该项目的实验设计将测试特定的营养管理计划的成功，以及当营养限制时特定的遗传学性能。这将包括评估生长绩效，身体状况，生殖性能和小牛生产。该项目将展示特定遗传学在各种营养方案中的表现，以及如何使用低质量饮食的战略补充来降低安大略省牛牛奶生产商的生产成本。