Alternative trace mineral supplementation strategies for improved cow performance

提高奶牛生产性能的替代微量矿物质补充策略

• 批准号: 560426-2020
• 负责人: Lardner, Herbert
• 金额: $ 3.33万
• 依托单位: University of Saskatchewan
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=723717
• 关键词: Alternative; trace; mineral; supplementation; strategies

This study will help to develop best animal management practices to improve cow-calf sector profitability and trace mineral (TM) supplementation programs for improved beef cow performance. This work will provide producers with evidence-based recommendations for mineral supplementation strategies during the breeding season and mitigate some potential reproductive impacts of high sulfate water. Injectable TM solutions are not currently licensed in Canada for cattle; however, use of effective injections may ensure that all cows have adequate TM status entering the breeding season. A reduction on non-pregnant cows would then lead to greater calving rates, increasing the pounds of calf weaned and economic returns to the cow-calf enterprise. A 3 year replicated study will be managed over three breeding seasons and will involve approximately 240 mature beef cows. The study will investigate the benefits of administering a TM injectable (compared to supplement TM free choice alone) on reproductive outcomes. Baseline values of mineral status will be measured 4 wk pre-calving, and cows will be randomly allocated to treatment after blocking by age. At 4 wk pre-calving, 4 wk pre-breeding, and at pregnancy 40 cows per treatment will have a blood sample drawn to determine mineral serum concentration. At 4 wk pre-calving, 4 wk pre-breeding, at breeding, and at pregnancy, a body condition score will be determined for all cows. A 63-d natural breeding program will be managed during the breeding season. Pasture clippings and water samples will be collected pre- and post-calving and monitored for mineral concentration throughout the study period. Blood samples will be analyzed for TM concentration. Ultrasound will be used to determine pregnancy 35 d after breeding. Reproductive performance will be evaluated by measuring overall pregnancy rate and calving rate. Calf weaning weights will also be recorded each yr to determine kg of calf weaned per treatment. Calf birth dates will be recorded to determine differences in calving distribution between treatments.A partial-budget analysis will be used to compare provision of MultiMin 90 with no provision of injectable mineral.

这项研究将有助于制定最佳动物管理实践，以提高母牛犊牛部门的盈利能力，并有助于制定微量矿物质 (TM) 补充计划，以提高肉牛的生产性能。这项工作将为生产者提供繁殖季节矿物质补充策略的循证建议，并减轻高硫酸盐水的一些潜在繁殖影响。加拿大目前尚未获得注射用 TM 解决方案用于牛的许可；然而，使用有效的注射可以确保所有奶牛在进入繁殖季节时都具有足够的 TM 状态。减少未怀孕的奶牛将导致更高的产犊率，增加断奶犊牛的体重和母牛企业的经济回报。一项为期 3 年的重复研究将在三个繁殖季节进行，涉及约 240 头成年肉牛。该研究将调查注射 TM 注射剂（与单独补充 TM 自由选择相比）对生殖结果的益处。将在产犊前 4 周测量矿物质状况的基线值，并在按年龄分组后将奶牛随机分配到治疗组。在产犊前 4 周、配种前 4 周以及怀孕时，每次处理将抽取 40 头奶牛的血液样本以确定矿物质血清浓度。在产犊前 4 周、配种前 4 周、配种时和怀孕时，将对所有奶牛进行身体状况评分。繁殖季节期间将实施63天的自然繁殖计划。在整个研究期间，将在产犊前和产犊后收集草屑和水样，并监测矿物质浓度。将分析血液样本的 TM 浓度。配种后35天用超声波确定是否怀孕。将通过测量总体妊娠率和产犊率来评估繁殖性能。每年还将记录犊牛断奶重量，以确定每次处理断奶的犊牛体重。将记录犊牛出生日期，以确定处理之间产犊分布的差异。将使用部分预算分析来比较提供 MultiMin 90 和不提供注射矿物质的情况。