剩余采食量和奶牛年龄对黑安格斯奶牛断奶后干物质采食量和泌乳高峰期的影响。
Influence of Residual Feed Intake and Cow Age on Dry Matter Intake Post-Weaning and Peak Lactation of Black Angus Cows.
作者信息
Parsons Cory T, Dafoe Julia M, Wyffels Samuel A, DelCurto Timothy, Boss Darrin L
机构信息
Northern Agricultural Research Center, Montana State University, Havre, MT 59501, USA.
Department of Animal and Range Sciences, Montana State University, Bozeman, MT 59717, USA.
出版信息
Animals (Basel). 2021 Jun 18;11(6):1822. doi: 10.3390/ani11061822.
We evaluated heifer post-weaning residual feed intake (RFI) classification and cow age on dry matter intake (DMI) at two stages of production. Fifty-nine non-lactating, pregnant, (Study 1) and fifty-four lactating, non-pregnant (Study 2) commercial black Angus beef cows were grouped by age and RFI. Free-choice, hay pellets were fed in a GrowSafe feeding system. In Study 1, cow DMI (kg/d) and intake rate (g/min) displayed a cow age effect ( < 0.01) with an increase in DMI and intake rate with increasing cow age. In Study 2, cow DMI (kg/d) and intake rate (g/min) displayed a cow age effect ( < 0.02) with an increase in DMI and intake rate with increasing cow age. Milk production displayed a cow age × RFI interaction ( < 0.01) where both 5-6-year-old and 8-9-year-old low RFI cows produced more milk than high RFI cows. For both studies, intake and intake behavior were not influenced by RFI ( ≥ 0.16) or cow age × RFI interaction ( ≥ 0.21). In summary, heifer's post-weaning RFI had minimal effects on beef cattle DMI or intake behavior, however, some differences were observed in milk production.
我们评估了小母牛断奶后剩余采食量（RFI）分类和奶牛年龄对两个生产阶段干物质采食量（DMI）的影响。59头非泌乳、怀孕的（研究1）和54头泌乳、未怀孕的（研究2）商业黑安格斯肉牛按年龄和RFI分组。在GrowSafe饲喂系统中自由采食干草颗粒。在研究1中，奶牛的DMI（kg/d）和采食率（g/min）表现出奶牛年龄效应（P<0.01），随着奶牛年龄的增加，DMI和采食率升高。在研究2中，奶牛的DMI（kg/d）和采食率（g/min）表现出奶牛年龄效应（P<0.02），随着奶牛年龄的增加，DMI和采食率升高。产奶量表现出奶牛年龄×RFI交互作用（P<0.01），5至6岁和8至9岁的低RFI奶牛产奶量均高于高RFI奶牛。对于两项研究，采食量和采食行为均不受RFI（P≥0.16）或奶牛年龄×RFI交互作用（P≥0.21）的影响。总之，小母牛断奶后的RFI对肉牛的DMI或采食行为影响极小，然而产奶量存在一些差异。
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