Sprinkle James E, Sagers Joseph K, Hall John B, Ellison Melinda J, Yelich Joel V, Brennan Jameson R, Taylor Joshua B, Lamb James B
Nancy M. Cummings Research, Extension & Education Center, University of Idaho, Carmen, ID 83462, USA.
Jefferson & Clark County Extension, University of Idaho, Rigby, ID 83442, USA.
Animals (Basel). 2021 Nov 11;11(11):3219. doi: 10.3390/ani11113219.
The objective was to determine if low- or high-residual feed intake (LRFI or HRFI, = 24 for each) Hereford × Angus cows on continuously or rotationally grazed rangeland altered their grazing behavior when provided a protein supplement in late autumn. Treatments included continuously grazed, control (CCON, = 12); continuously grazed, supplemented (CTRT, = 12); rotationally grazed, control (RCON, = 12); and rotationally grazed, supplemented pastures (RTRT, = 12). Cows in each treatment had grazing time (GT), resting time (RT), and walking time (WLK) measured for 2 years with accelerometers. Bite rate (BR) was also measured. Time distributions of GT and RT differed by year ( < 0.05), being influenced by colder temperatures in 2016. Cattle in 2016 spent more time grazing during early morning and late evening ( < 0.05) and rested more during the day ( < 0.05). In 2017, cattle in the CCON treatment walked more ( < 0.05) during early morning time periods than did the CTRT cattle, indicative of search grazing. All supplemented cattle had greater BR ( < 0.05) than control cattle in 2017. Cattle with increased nutritional demands alter grazing behavior in a compensatory fashion when grazing late-season rangelands.
目的是确定在连续或轮牧的牧场上，低残留采食量或高残留采食量（LRFI或HRFI，每组n = 24）的赫里福德×安格斯母牛在深秋提供蛋白质补充剂时，其放牧行为是否会发生改变。处理包括连续放牧、对照（CCON，n = 12）；连续放牧、补充（CTRT，n = 12）；轮牧、对照（RCON，n = 12）；以及轮牧、补充牧场（RTRT，n = 12）。使用加速度计对每个处理组的母牛的放牧时间（GT）、休息时间（RT）和行走时间（WLK）进行了2年的测量。还测量了咬食率（BR）。GT和RT的时间分布因年份而异（P < 0.05），这受到2016年较冷温度的影响。2016年的牛在清晨和傍晚花费更多时间放牧（P < 0.05）且白天休息更多（P < 0.05）。2017年，CCON处理组的牛在清晨时段比CTRT组的牛行走更多（P < 0.05），这表明是在搜寻放牧。2017年，所有补充组的牛的BR均高于对照组（P < 0.05）。营养需求增加的牛在放牧后期牧场时会以补偿方式改变放牧行为。
