Martin S W, Meek A H, Davis D G, Johnson J A, Curtis R A
Can J Comp Med. 1981 Apr;45(2):103-12.
The results of the second year of the project confirmed most of the major findings from the initial year. Feeding cornsilage, particularly as the major roughage in the first month after arrival was associated with excess mortality. Mixing of cattle from different sources and vaccinating against respiratory disease appeared to be the most important additional factors that increased mortality rates. Delaying vaccination at least two days postarrival may have prevented the negative effects of vaccination but only in calves fed cornsilage. Morbidity rates were highly variable among farms but were positively correlated with mortality rates and treatment costs. The occurrence of infectious thromboembolic meningoencephalitis appeared to share some of the same risk factors as mortality; whereas, urolithiasis did not. Water deprivation may be a risk factor in the occurrence of urolithiasis. Fibrinous pneumonia was again the most frequent cause of death. Relative to year one, infectious thromboembolic meningoencephalitis increased in frequency and only one death was attributed to bovine virus diarrhea.
该项目第二年的结果证实了第一年的大部分主要发现。喂食玉米青贮料，尤其是在到达后的第一个月作为主要粗饲料，与过高的死亡率相关。混合不同来源的牛并接种呼吸道疾病疫苗似乎是增加死亡率的最重要的其他因素。到达后至少推迟两天接种疫苗可能预防了接种疫苗的负面影响，但仅在喂食玉米青贮料的犊牛中有效。发病率在各农场之间差异很大，但与死亡率和治疗成本呈正相关。传染性血栓栓塞性脑膜脑炎的发生似乎与死亡率有一些相同的风险因素；而尿石症则没有。缺水可能是尿石症发生的一个风险因素。纤维素性肺炎再次是最常见的死亡原因。与第一年相比，传染性血栓栓塞性脑膜脑炎的发生率增加，只有一例死亡归因于牛病毒性腹泻。
