Dill Matheus Dhein, Pereira Gabriel Ribas, Costa João Batista Gonçalves, Canellas Leonardo Canali, Peripolli Vanessa, Neto José Braccini, Sant'Anna Danilo Menezes, McManus Concepta, Barcellos Júlio Otávio Jardim
Center for Studies and Research in Agribusiness - CEPAN. Núcleo de Estudos em Sistemas de Produção de Bovinos de Corte e Cadeia Produtiva - NESPRO, Federal University of Rio Grande do Sul - UFRGS, Ave. Bento Gonçalves 7712, 91540-000, Porto Alegre, RS, Brazil.
Unidade Acadêmica de Garanhuns, Federal Rural University of Pernambuco - UFRPE, Avenida Bom Pastor, s/n, 55292-270, Garanhuns, PE, Brazil.
Trop Anim Health Prod. 2015 Oct;47(7):1255-60. doi: 10.1007/s11250-015-0856-x. Epub 2015 Jun 6.
We investigated the differences between weaning rates and technologies adopted by farmers in cow-calf production systems in Rio Grande do Sul State, Brazil. Interviews were carried out with 73 farmers about 48 technologies that could affect reproductive performance. Data were analyzed by multivariate analysis using a non-hierarchical cluster method. The level of significance was set at P < 0.05. Three distinct clusters of farmers were created (R (2) = 0.90), named as low (LWR), intermediate (IWR), and high (HWR) weaning rate, with 100, 91, and 96 % of the farmers identified within their respective groups and average weaning rates of 59, 72, and 83 %, respectively. IWR and HWR farmers used more improved natural pasture, fixed-time artificial insemination, selection for birth weight, and proteinated salt compared to LWR. HWR farmers used more stocking rate control, and IWR farmers used more ultrasound to evaluate reproductive performance compared to the LWR group. IWR and HWR adopted more technologies related to nutrition and reproductive aspects of the herd in comparison to LWR. We concluded that farmers with higher technology use on farm had higher weaning rates which could be used to benefit less efficient farmers.
我们调查了巴西南里奥格兰德州奶牛-犊牛生产系统中农民采用的断奶率和技术之间的差异。就48种可能影响繁殖性能的技术对73位农民进行了访谈。使用非层次聚类方法通过多变量分析对数据进行分析。显著性水平设定为P < 0.05。创建了三个不同的农民群体（R (2) = 0.90），分别命名为低断奶率（LWR）、中等断奶率（IWR）和高断奶率（HWR）群体，各自群体中分别有100%、91%和96%的农民被识别出来，平均断奶率分别为59%、72%和83%。与LWR相比，IWR和HWR的农民更多地使用改良天然牧场、定时人工授精、按出生体重进行选择以及蛋白质盐。与LWR组相比，HWR的农民更多地控制饲养密度，IWR的农民更多地使用超声波评估繁殖性能。与LWR相比，IWR和HWR在畜群营养和繁殖方面采用了更多相关技术。我们得出结论：农场技术使用水平较高的农民断奶率更高，这可用于使效率较低的农民受益。
