Scholarlink

<p>Two studies were conducted on the relationship between ruminal mat consistency (RMC) and (1) calf mortality or (2) immunity. Assessment of RMC was by ten repeated manual compressions of the middle rumen; good-RMC showed no fluid bounce-back (FBB), while poor-RMC showed FBB. The first study examined whether RMC affected calf mortality. Monthly feeding management guidance (FMG) was implemented for 5&#xa0;years on a commercial farm with Holstein–Friesian × Japanese black calves, directing increased forage consumption for poor-RMC calves aged 50–180&#xa0;days. Compared to 35 control farms, the FMG period showed significantly lower total mortality (3.8% vs. 0.8%, <i>P</i> &lt; 0.001, OR = 4.7) and lower respiratory mortality (2.3% vs. 0.1%, <i>P</i> &lt; 0.001, OR = 18.3). The second study tested the hypothesis that RMC affects calf immunity. Peripheral blood of good-RMC (n = 6) and poor-RMC (n = 6) calves was compared. Good-RMC showed higher phagocytosis in monocytes (<i>P</i> = 0.05, r = 0.63) and granulocytes (<i>P</i> = 0.02, r = 0.78), and higher numbers of CD4 + (<i>P</i> = 0.07, r = 0.58), CD8 + (<i>P</i> = 0.07, r = 0.60), and B-cells (<i>P</i> = 0.03, r = 0.62). In mRNA expression, good-RMC showed lower <i>TNF-α</i> (<i>P</i> = 0.02, r = 0.70), <i>IL-1</i> (<i>P</i> = 0.09, r = 0.49), <i>IL-12</i> (<i>P</i> = 0.04, r = 0.59) and <i>IL-10</i> (<i>P</i> = 0.13, r = 0.44), and higher <i>IL-16</i> (<i>P</i> = 0.07, r = 0.53) compared to poor-RMC. These results suggest that RMC affects calf mortality and immunity, emphasizing the importance of feeding management in improving sustainability.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

The relationship between ruminal mat consistency of calves and mortality or immunity

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年5月22日

查看全文
  • Shinsuke Abe,
  • Kazuho Suzuki,
  • Yosuke Sasaki,
  • Masahiro Yasuda

摘要

Two studies were conducted on the relationship between ruminal mat consistency (RMC) and (1) calf mortality or (2) immunity. Assessment of RMC was by ten repeated manual compressions of the middle rumen; good-RMC showed no fluid bounce-back (FBB), while poor-RMC showed FBB. The first study examined whether RMC affected calf mortality. Monthly feeding management guidance (FMG) was implemented for 5 years on a commercial farm with Holstein–Friesian × Japanese black calves, directing increased forage consumption for poor-RMC calves aged 50–180 days. Compared to 35 control farms, the FMG period showed significantly lower total mortality (3.8% vs. 0.8%, P < 0.001, OR = 4.7) and lower respiratory mortality (2.3% vs. 0.1%, P < 0.001, OR = 18.3). The second study tested the hypothesis that RMC affects calf immunity. Peripheral blood of good-RMC (n = 6) and poor-RMC (n = 6) calves was compared. Good-RMC showed higher phagocytosis in monocytes (P = 0.05, r = 0.63) and granulocytes (P = 0.02, r = 0.78), and higher numbers of CD4 + (P = 0.07, r = 0.58), CD8 + (P = 0.07, r = 0.60), and B-cells (P = 0.03, r = 0.62). In mRNA expression, good-RMC showed lower TNF-α (P = 0.02, r = 0.70), IL-1 (P = 0.09, r = 0.49), IL-12 (P = 0.04, r = 0.59) and IL-10 (P = 0.13, r = 0.44), and higher IL-16 (P = 0.07, r = 0.53) compared to poor-RMC. These results suggest that RMC affects calf mortality and immunity, emphasizing the importance of feeding management in improving sustainability.