Sánchez Zazil, Galina Carlos Salvador, Vargas Bernardo, Romero Juan José, Estrada Sandra
Department of Reproduction, Faculty of Veterinary Medicine and Zootechnics, National Autonomous University of Mexico, Mexico City 04510, Mexico.
Regional Postgraduate in Tropical Veterinary Sciences, Veterinary Medicine School, National University, Heredia 40101, Costa Rica.
Animals (Basel). 2020 Jan 10;10(1):111. doi: 10.3390/ani10010111.
The level of adoption of herd management information system veterinary automated management and production control program (VAMPP) Bovine and its impact on productivity of 912 specialized dairy systems with at least 5 years of information recorded was studied. Herds were classified as low ( = 389), medium ( = 343), or high ( = 180) adoption level on the basis of extent and consistency of record keeping for variables related to production, reproduction, and health. For each herd, within-year averages were obtained for six performance traits: age at first calving (AFC), days open (DO), daily milk yield (DMY), productive life (PL), incidence of clinical mastitis (MAST), and incidence of lameness (LAM). These variables were investigated with a generalized linear mixed model that included the fixed effects of the adoption level, follow-up year, and their interaction, adjusted by the fixed effects of herd size, agroecological zone, calendar period, breed group, and the random effects of variation between/within herds. A significant effect of the adoption level over all the variables was observed, except DMY and PL. The follow-up year was significant for all the variables except LAM. There were marked reductions for AFC and DO in the first 4 years of follow-up. AFC was higher and DO shorter in the low compared to medium and high level of adoption herds ( < 0.001). DMY showed a significant increasing trend ( < 0.001), regardless of the adoption level. There was higher MAST and LAM incidence in the higher adoption level ( < 0.05). The economic benefit was estimated through a stochastic simulation model using an approach based in partial budget analysis. For a herd with a medium level of adoption, the change in gross margin (GM $USD) and marginal return rate (MRR %) for the first 5 years of use of the system was estimated. Under these conditions, there was a GM of $6890 and MRR of 163%. Variation of ±10% in DMY and DO caused changes in the GM of ±$1000 and ±$110, respectively, and in MRR ±24% and ±4%, respectively. The trends suggest a positive influence of VAMPP in productive and reproductive traits during the first years of implementation, with less benefit for the low adoption levels.
研究了牛群管理信息系统兽医自动化管理与生产控制程序（VAMPP）奶牛系统的采用水平及其对912个记录信息至少5年的专业奶牛场生产效率的影响。根据与生产、繁殖和健康相关变量的记录保存程度和一致性，将牛群分为低采用水平（=389）、中等采用水平（=343）或高采用水平（=180）。对于每个牛群，获取了六个生产性能性状的年内平均值：初产年龄（AFC）、空怀天数（DO）、日产奶量（DMY）、生产寿命（PL）、临床乳腺炎发病率（MAST）和跛足发病率（LAM）。使用广义线性混合模型对这些变量进行研究，该模型包括采用水平、随访年份及其交互作用的固定效应，并通过牛群规模、农业生态区、日历时期、品种组的固定效应以及牛群间/牛群内变异的随机效应进行调整。观察到除DMY和PL外，采用水平对所有变量均有显著影响。随访年份对除LAM外的所有变量均有显著影响。在随访的前4年中，AFC和DO显著降低。与中等和高采用水平的牛群相比，低采用水平牛群的AFC更高，DO更短（<0.001）。无论采用水平如何，DMY均呈现显著上升趋势（<0.001）。高采用水平下MAST和LAM的发病率更高（<0.05）。通过基于部分预算分析的方法，使用随机模拟模型估计经济效益。对于中等采用水平的牛群，估计了该系统使用前5年的毛利润变化（GM，美元）和边际回报率（MRR，%）。在这些条件下，毛利润为6890美元，边际回报率为163%。DMY和DO分别有±10%的变化，导致毛利润分别有±1000美元和±110美元的变化，边际回报率分别有±24%和±4%的变化。这些趋势表明，在实施的头几年，VAMPP对生产和繁殖性状有积极影响，低采用水平的受益较少。
