Rarámuri Criollo cattle producers often crossbreed their cows with improved beef-breed bulls and/or retain and develop their yearlings on rangeland because of limited weaned calf markets, however it is unknown if Rarámuri Criollo steers exhibit marketable weight gains and carcass qualities, or desirable grazing behaviors documented in cows of this biotype. We evaluated two cohorts (cohort: 1 = 31, 2 = 26) of Rarámuri Criollo (JRC), Mexican Criollo (MC) and Criollo × beef-breed crossbred (XC) steers to investigate effects of biotype on growth, carcass traits, and landscape utilization. Steers were weighed approximately once every 2-mo and average daily gains (ADG) calculated. Nine JRC and XC steers per cohort were monitored at 5-min intervals via global positioning systems (GPS) for 1-mo during winter (2015–16) and late-summer (2016–17). Weight and carcass data were analyzed using mixed measures procedures to identify differences between biotype through time. Discriminant analyses were conducted to determine whether grazing behaviors could be discriminated among: 1) JRC and XC steers and JRC cows; 2) steers by season (winter vs. summer); and 3) steers of cohort 1 and 2. Final live and carcass weights of XC were greater than JRC and MC, but all were market ready at 30-mo following a grass-finishing protocol. Carcass quality and ADG were not different among biotypes. Steers were discriminated into different season or cohort groups based on grazing behavior differences but JRC and XC steers exhibited grazing patterns that were similar to those previously observed in JRC cows. Our results suggest that JRC, MC, and XC steers can be developed to slaughter weights in 30-mo using a rangeland-based grass-fed protocol, and that JRC and XC steers exhibit desirable grazing behaviors previously observed in JRC cows.

Rarámuri克里奥牛生产者经常杂交繁育的奶牛肉牛改良品种公牛和/或保留和发展上，因为有限的断奶牛犊市场的牧场他们一岁，但它是未知的，如果Rarámuri克里奥公牛表现出适销对路的增重和胴体品质，或在这种生物型奶牛中有良好的放牧行为。我们评估了RarámuriCriollo（JRC），墨西哥Criollo（MC）和Criollo×牛肉杂交（XC）ers牛的两个队列（队列：1 = 31，2 = 26），以研究生物型对生长，car体性状和景观利用。2-牛每2个月大约称重一次，并计算平均日增重（ADG）。在冬季（2015-16年）和夏季末（2016-17年），通过全球定位系统（GPS）以每5分钟为间隔对9个JRC和XC转向进行了监测，监测间隔为1个月。使用混合测量程序分析体重和car体数据，以确定生物型之间随时间的差异。进行了判别分析，以确定是否可以区分放牧行为：1）JRC和XC ers牛和JRC奶牛；2）按季节（冬季与夏季）进行转向；和3）第1组和第2组的ste牛。XC的最终活重和car体重量均大于JRC和MC，但按照草场整理协议，它们都已准备好在30个月上市。bio体质量和ADG在不同生物类型之间没有差异。根据放牧行为的差异，将牛分为不同的季节或同类群，但JRC和XC ers牛的放牧模式与先前在JRC奶牛中观察到的相似。我们的研究结果表明，可以使用基于牧场的草饲协议，将JRC，MC和XC ers牛发展为30个月内的屠宰体重，并且JRC和XC ers牛表现出先前在JRC奶牛中观察到的理想放牧行为。bio体质量和ADG在不同生物类型之间没有差异。根据放牧行为的差异，将牛分为不同的季节或同类群，但JRC和XC ers牛的放牧模式与先前在JRC奶牛中观察到的相似。我们的研究结果表明，可以使用基于牧场的草饲协议，将JRC，MC和XC ers牛发展到30个月内的屠宰体重，并且JRC和XC ers牛表现出先前在JRC奶牛中观察到的理想放牧行为。bio体质量和ADG在不同生物类型之间没有差异。根据放牧行为的差异，将牛分为不同的季节或同类群，但JRC和XC ers牛的放牧模式与先前在JRC奶牛中观察到的相似。我们的研究结果表明，可以使用基于牧场的草饲协议，将JRC，MC和XC ers牛发展为30个月内的屠宰体重，并且JRC和XC ers牛表现出先前在JRC奶牛中观察到的理想放牧行为。